Oregon 
Theodore R KjibngDski, Governor 
NOTICE OF ADOPTED AMENDMENT 
Department of Land Conservation and Development 
635 Capitol Street, Suite 150 
Salem, OR 97301-2540 
(503) 373-0050 
Fax (503) 378-5518 
w w w . lcd.state.or .us 
Mis. 
11/30/2009 
TO: Subscribers to Notice of Adopted Plan 
or Land Use Regulation Amendments 
FROM: Plan Amendment Program Specialist 
SUBJECT: City of Grants Pass Plan Amendment 
DLCD File Number 007-09 
The Department of Land Conservation and Development (DLCD) received the attached notice of adoption. 
Due to the size of amended material submitted, a complete copy has not been attached. A Copy of the 
adopted plan amendment is available for review at the DLCD office in Salem and the local government 
office. 
Appeal Procedures* 
DLCD ACKNOWLEDGMENT or DEADLINE TO APPEAL: Friday, December 11, 2009 
This amendment was submitted to DLCD for review prior to adoption. . Pursuant to ORS 197.830(2)(b) 
only persons who participated in the local government proceedings leading to adoption of the amendment 
are eligible to appeal this decision to the Land Use Board of Appeals (LUBA). 
If you wish to appeal, you must file a notice of intent to appeal with the Land Use Board of Appeals 
(LUBA) no later than 21 days from the date the decision was mailed to you by the local government. If 
you have questions, check with the local government to determine the appeal deadline. Copies of the 
notice of intent to appeal must be served upon the local government and others who received written notice 
of the final decision from the local government. The notice of intent to appeal must be served and filed in 
the form and manner prescribed by LUBA, (OAR Chapter 661, Division 10). Please call LUBA at 
503-373-1265, if you have questions about appeal procedures. 
*NOTE: THE APPEAL DEADLINE IS BASED UPON THE DATE THE DECISION WAS 
MAILED BY LOCAL GOVERNMENT. A DECISION MAY HAVE BEEN MAILED 
TO YOU ON A DIFFERENT DATE THAT IT WAS MAILED TO DLCD. AS A 
RESULT, YOUR APPEAL DEADLINE MAY BE EARLIER THAN THE ABOVE 
DATE SPECIFIED. 
Cc: Lora Glover, City of Grants Pass 
Gloria Gardiner, DLCD Urban Planning Specialist 
Chris Shirley, FEMA Specialist 
John Renz, DLCD Regional Representative 
<paa> N 
2 
_J Iii ¡ am i r • electronic G ma fleti 
DLCD DEPTOF 
Notice of Adoption m im 
THIS FORM MUST BE MAILED TO DLCD LAND CON3E 
WITHIN 5 WORKING DAYS AFTER THE FINAL DECISION * AND DEVELOP WEN I 
PER ORS 197.610, OAR CHAPTER 660 - DIVISION 18 IwlJl ÜEUst 0p|S 
Jurisdiction: d /TV OP £r /WTS P 1 / ^ Local file number: £fi - QO%0000<4 
Date of Adoption: Date Mailed: { [ g ^ c f ' HOSDOÖdj 
Was a Notice of Proposed Amendment (Form 1) mailed to DLCD? Select oneDate: 
0 Comprehensive Plan Text Amendment O Comprehensive Plan Map Amendment 
J Land Use Regulation Amendment R^Zoning Map Amendment ^LODb KW^Hf^ 
• New Land Use Regulation • Other: 
Summarize the adopted amendment. Do not use technical terms. Do not write "See Attached". 
fiWPTlÖH ÖF (UM15UT CftEC-TiVe Fux>^ /WSOfcttM^ ^TUhM^Fi^ 
f=LCDt> /MSM.-RAWC5 WlH C f W ^ M T E b 3 , • 
Does the Adoption differ from proposal? Please select one "¿vM" 
Plan Map Changed from: ^ /A- to: "k/ f4-
Zone Map Changed from: to: 
Location: Acres Involved: ^h. 
Specify Density: Previous: New: fy j f t -
Applicable statewide planning goals: 
X 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 
• • • • • • 0 • • • • • • • D • • • • 
Was an Exception Adopted? • YES ^ N O 
Did DLCD receive a Notice of Proposed Amendment... 
45-days prior to first evidentiary hearing? H^Yes • No 
If no, do the statewide planning goals apply? • Yes • No 
If no, did Emergency Circumstances require immediate adoption? • Yes • No 
D L C D f i l e N o . 007-09 (17717) [15859] (This file also refers to D L C D Fi le Grants Pass 004-09) 
Please list ai( affected State or Federal Agencies, Local Governments or Special Districts: 
ÖDuusny 
b L C Ä 
Local Contact: L O W &)LD\J@/t Phone: {&{)cflt{- (¿ZS^Extension: 
Address: ( o f M U * Fax Number:5V MlU- JZtfS 
City: a m W i M ^ O R Zip: E-mail Address:/^ 
ADOPTION SUBMITTAL REQUIREMENTS 
This form must be mailed to DLCD within 5 working days after the final decision 
perORS 197.610, OAR Chapter 660 - Division 18. 
1. Send this Form and TWO Complete Copies (documents and maps) of the Adopted Amendment to: 
ATTENTION: PLAN AMENDMENT SPECIALIST 
DEPARTMENT OF LAND CONSERVATION AND DEVELOPMENT 
635 CAPITOL STREET NE, SUITE 150 
SALEM, OREGON 97301-2540 
2. Electronic Submittals: At least one hard copy must be sent by mail or in person, but you may also submit 
an electronic copy, by either email or FTP. You may connect to this address to FTP proposals and 
adoptions: webserverJcd.state.or.us. To obtain our Username and password for FTP, call Mara Ulloa at 
503-373-0050 extension 238, or by emailing mara.ulloa@state.or,us. 
3. Please Note: Adopted materials must be sent to DLCD not later than FIVE (5) working days 
following the date of the final decision on the amendment. 
4. Submittal of this Notice of Adoption must include the text of the amendment plus adopted findings 
and supplementary information. 
5. The deadline to appeal will not be extended if you submit this notice of adoption within five working 
days of the final decision. Appeals to LUBA may be filed within TWENTY-ONE (21) days of the date, 
the Notice of Adoption is sent to DLCD. 
6. In addition to sending the Notice of Adoption to DLCD, you must notify persons who 
participated in the local hearing and requested notice of the final decision. 
7. Need More Copies? You can now access these forms online at http://www.lcd.state.or.us/. Please 
print on 8 - l / 2 \ l l green paper only. You may also call the DLCD Office at (503) 373-0050; or Fax 
your request to: (503) 378-5518; or Email your request to mara.ulloa@state.or.us - ATTENTION: 
PLAN AMENDMENT SPECIALIST. 
http://www.lcd.state.or.us/LCD/forms.shtml Updated November 27,2006 
November 20, 2009 
City of Grants Pass 
Department of Land Conservation & Development 
Attn: Plan Amendment Specialist 
635 Capitol Street NE, Suite 150 
Salem OR 97301-2540 
Re: Notice of Adoption ~ Flood Map Amendments 
File No.: 09-40500004 & 09-40500006 
Dear Sir/Madam, 
Please find enclosed the Notice of Adoption for the above-referenced file. If you have any question, 
please do not hesitate to contact me. 
Lor a Glover 
Associate Planner 
Ext. #6427 
lglover@grantspassoregon.gov 
Enclosure: Notice of Adoption, Ordinance No. 5498 w/record 
pc: Stephen Lucker, DLCD w/Ordinance No. 5498 
Dennis Hunsinger, Acting Regional Administrator, FEMA Region X w/Ordinance No. 5498 
C/F, tax lot file 
101 Northwest "A" Streel, Grants Pass, Oregon 97526 * (541)474-6355 * FAX (541) 476-9218 * www.grantspassoregon.gov 
Sincerely, 
ORDINANCE NO. 5498 
AN ORDINANCE OF THE COUNCIL OF THE CITY OF GRANTS PASS AMENDING: 
(1) THE SPECIAL PURPOSE DISTRICT MAP FOR THE FLOOD HAZARD 
DISTRICT BY ADOPTING THE CURRENT FLOOD INSURANCE STUDY (FIS) AND 
FLOOD INSURANCE RATE MAPS (FIRM) FOR JOSEPHINE COUNTY AND 
INCORPORATED AREAS EFFECTIVE DECEMBER 3, 2009; 
(2) SECTION 13.200 (FLOOD HAZARD DISTRICT) OF THE CITY OF 
GRANTS PASS DEVELOPMENT CODE; AND 
(3) ELEMENT 5, SECTION 5.30 ~ FLOOD HAZARD, OF THE GRANTS 
PASS AND URBANIZING AREA COMPREHENSIVE COMMUNITY DEVELOPMENT 
PLAN; AND DECLARING AN EMERGENCY. 
WHEREAS: 
1. The Grants Pass and Urbanizing Area Comprehensive Community Development 
Plan was adopted December 15, 1982; and 
2. The goal of the amendments is to maintain the City's eligibility to participate in 
National Flood Insurance Program (NFIP); and 
3. The proposal is consistent with the goals and policies of the Comprehensive 
Plan; and 
4. The applicable criteria from the Comprehensive Plan and the Development Code 
are satisfied, and approval of the proposal is recommended by the Urban Area 
Planning Commission to the City Council. 
NOW, THEREFORE, THE CITY OF GRANTS PASS HEREBY ORDAINS: 
Section 1: Adopt into the Comprehensive Plan the Flood Insurance Study (FIS) 
Volume 1 and 2, as set forth in Exhibit "A" attached hereto. 
Section 2: Adopt into the Comprehensive Plan the Flood Insurance Rate Maps 
(FIRM) for Josephine County, Oregon and Incorporated areas effective December 3, 
2009 (amending the Special Purpose District Map for the Flood Hazard District), as set 
forth in Exhibit "A" attached hereto. 
Section 3: Revise Section 13.200 (Flood Hazard District) of the City of Grants 
Pass Development Code as set forth in Exhibit "A" attached hereto. 
Section 4: Revise Element 5, Section 5.30 ~ Flood Hazard of the 
Comprehensive plan, to reference the new FIS and FIRM effective December 3, 2009, 
as set forth in Exhibit "A" attached hereto. 
Section 5: Repeal Sections 9.50-9.56 (Flood Hazard Regulations), Title 9: 
Land Development and Public Improvements of the City of Grants Pass Municipal 
Code, and re-title Chapter 4 of Title 9 as "Measure 7" as set forth in Exhibit "B" attached 
hereto. 
Section 6: An emergency is hereby declared to exist and in the interest of the 
public peace, health and safety of the City of Grants Pass and the inhabitants thereof, 
this Ordinance has been introduced and read twice and placed upon its final passage at 
a single meeting of the Council and shall take effect immediately upon passage. 
ADOPTED by the Council of the City of Grants Pass, Oregon, in regular session 
this 4th day of November, 2009. 
SUBMITTED to and Ayxa/WirT? by the Mayor of the City of Grants Pass, 
Oregon, this ^.v^dav of November, 2009. 
ATTEST: 
Date submitted to Mayor: ^ - 9 
Finance Director 
Approved as to Form, Mark Bartholomew, Interim City Attorney 
Exhibit "A" to Adopting Ordinance 
Exhibit A consists of the following documents which have not been reproduced in their 
entirety to conserve resources: 
1. Flood Insurance Study (FIS) for Josephine County, Oregon and 
Incorporated areas, dated December 3,2009 (the full report is available in 
the Planning file). 
2. Flood Insurance Rate Maps (FIRM) dated December 3, 2009 (the full set 
of maps is available in the Community Development office). 
3. Revised Section 13.200 ~ Flood Hazard District of the Development Code 
(available in the Planning file). 
4. Revised Element 5, Section 5.30 - Flood Hazard of the Comprehensive 
Plan (available in the Planning file). 
Exhibit "B" to Adopting Ordinance 
Exhibit B consists of the following document: 
1. Revised Title 9 of the Municipal Code. 
E X H I B I T H n o R » i » * « e 
FLOOD 
INSURANCE 
STUDY 
JOSEPHINE COUNTY, OREGON 
AND INCORPORATED AREAS 
VOLUME 1 OF 2 
COMMUNITY COMMUNITY 
NAME NUMBER 
CAVE JUNCTION, CITY OF . 4 1 0 1 0 7 
GRANTS PASS, CITY OF 410108 
JOSEPHINE COUNTY UNINCORPORATED AREAS 4 ] 5590 
Effective: 
December 3, 20Q9 
Flood Insurance Study Number 
41033CV001A 
EXHIBIT JL- rtTTrtòU^WT I 
• 'f 
NOTICE TO 
FLOOD INSURANCE STUDY USERS 
Communities participating in the National Flood Insurance Program have established repositories of flood 
hazard data for floodplain management and flood insurance purposes. This Flood Insurance Study (FIS) 
report may not contain all data available within the Community Map Repository- Please contact the 
Community Map Repository for any additional data. 
Selected Flood Insurance Rate Map panels for the community contain information that was previously shown 
separately on the corresponding Flood Boundary and Floodway Map panels (e.g, floodways, cross sections). 
In addition, former flood hazard zone designations have been changed as follows: 
Old Zone 
AI through A3 0 
VI through V30 
B 
C 
Part or all of this may be revised and republished at any time. In addition, part of this FIS may be revised by 
a Letter of Map Revision process, which does not involve republication or redistribution of the FIS. It is, 
therefore, the responsibility of the user to consult with community officials and to check the community 
repository' to obtain the most current FIS report components. 
This FIS report was revised on December 3,2009. User should refer to Section 10.0, Revision Descriptions, 
for further information. Section 10.0 is intended to present the most up-to-date information for specific 
portions of this FIS report. Therefore, users of this FIS report should be aware that the information presented 
in Section 10.0 supersedes information in Sections 1,0 through 9.0 of this FIS report. 
New Zone 
AE 
VE 
X (shaded) 
X(unshaded) 
TABLE OF CONTENTS'- VOLUME 1 
1.0 INTRODUCTION 
LI Purpose of Study 
1.2 Authority and Acknowledgements 
1.3 Coordination 
2.0 AREA STUDIED 
2.1 Scope of Study 
2.2 Community Description 
2.3 Principal Flood Problems 
2.4 Flood Protection Measures 
3.0 ENGINEERING METHODS 
3.1 Hydrologic Analyses 
3.2 Hydraulic Analyses 
3.3 Vertical Datum 
4.0 FLOODPLAIN MANAGEMENT APPLICATIONS 
4.1 Floodplain Boundaries 
4.2" Floodways 
5.0 INSURANCE APPLICATION 
6.0 FLOOD INSURANCE RATE MAP 
7.0 OTHER STUDIES 
8.0 LOCATION OF DATA 
9.0 BIBLIOGRAPHY AND REFERENCES 
1Q.0 REVISION DESCRIPTION 
FIGURES 
Figure 1 - Floodway Schematic 
TABLES 
Table.l - Initial, Intermediate, and Final CCO Meetings 
Table 2 - Flooding Sources Studied by Detailed Methods 
Table 3 - Flooding Sources Studied by Approximate Methods 
Table 4 - Summary of Discharges 
Table 5 - Range of Manning's Roughness Values 
Table 6 - Floodway Data 
Table 7 - Flood Insurance Zones Within Each Community 
Table 8 - Community Map History 
TABLES (continued! 
Table 9 - Revised Study Descriptions- 53 
Exhibit 1 ~ Flood Profiles 
Applegate River 
Deer Creek 
Gilbert Creek 
Illinois River 
East Fork Illinois River 
West Fork Illinois River 
Jumpoff Joe Creek 
Louse Creek 
Muiphy Creek 
Rogue River 
Rogue River Right Overbank 
Slate Creek 
Waters Creek • 
TABLE OF CONTENTS - VOLUME 2 
EXHIBITS 
Panels 01P-18P 
Panels 19P-23P 
Panels 24P-29P 
Panels 30P-35P 
Panels 36P-47P 
Panels 48P-59P 
Panels 60P-66P 
Panels 67P-80P 
Panels 81P-86P 
Panels 87P-100P 
Panel 10 IP 
Panels 102P.-108P 
Panels 109P-11 IP 
PUBLISHED SEPARATELY 
Flood Insurance Rate Map Index 
Flood Insurance Rate Map 
FLOOD INSURANCE STUDY 
; JOSEPHINE COUNTY, OREGON AND INCORPORATED AREAS 
1.0 INTRODUCTION 
1.1 Purpose of Study 
This Flood Insurance Study revises and updates information on the existence and severity of 
flood hazards in the geographic area of Josephine County, including the Cities of Cave 
Junction and Grants Pass; and the unincorporated areas of Josephine County (referred to 
collectively herein as Josephine County), and aids in the administration of the National Flood 
Insurance Act of 1968 and the Flood Disaster Protection Act of 1973. This study has 
developed flood-risk data for various areas of the community that will be used to establish 
actuarial flood insurance rates and to assist the community in its efforts to promote sound 
floodp lain management. Minimum floodplain management requirements for participation in 
the National Flood Insurance Program (NFIP) are set forth in the Code of Federal 
Regulations at 44 CFR, 60.3. 
In some states or communities, floodplain management criteria or regulations may exist that 
are more restrictive or comprehensive than the minimum Federal requirements. In such 
cases, the more restrictive criteria take precedence and the State (or other jurisdictional 
agency) will be able to explain them. 
1.2 Authority and Acknowledgments 
The sources of/authority for this Flood Insurance Study are the National Flood Insurance Act 
of 1968 and the Flood Disaster Protection Act of 1973. 
The hydrologic and hydraulic analyses for the studies in Grants Pass and unincorporated 
Josephine County were performed by the- U.S. Geological Survey (USGS) for the Federal 
Emergency Management Agency (FEMA) under Interagency Agreement No. IAA-H-14-78, 
Project Order No, 8. The analysis for the "City of Cave Junction was performed under 
Amendment 1-2 of the same contract. Analyses for the City of Cave Junction and 
unincorporated Josephine County were completed in July 1980. The original analysis for the 
City of Grants Pass was completed in July 1979. The restudy of the reach of the Rogue 
River flowing through Grants Pass was performed by OTAK, Incorporated. This additional 
work was completed in December .1989 for FEMA under Contract No. EMW-89-C-2847. 
The countywide.update was performed by WEST Consultants,. Inc. for FEMA under 
ContractNo. EMS-20010-0>0068.. Updated aeriál photography dated 2005 was used in the 
analysis. Work on the countywide update was completed in October 2008. 
1.3 Coordination 
v 
The dates of the initial, intermediate, ánd final CCO meetings held for the previous FIS 
reports for "Josephine County and the incorporated communities within its boundaries are 
shown in Table 1, "Initial, Intermedíate, and Final CCO Meetings"; They were attended by 
•representatives of FEMA, the U.S. Geological Survey, the communities, and the study 
contractor. 
1 
Table 1. Initial, Intermediate, and Final CCO Meetings 
Community Initial CCO Date ftS0!?^ Final CCO Date 
— CCO Date(s) — ~— 
Cave Junction, City of January 12, 1978 May 12, 1980 June 3, 1981 
Grants Pass, City o f January 1978 S e P t e m b e r l 9> 1 9 9 0 
Josephine County, ; ^ m Q ^ ^ 
unincorporated areas 
Streams requiring detailed study were identified at a meeting held on January 12,1978. In 
attendance were representatives of the U.S. Geological Survey, FEMA, Josephine County, 
and the communities of Cave Junction and Grants Pass. The U.S. Army Corps of Engineers 
(COE) provided hydrologic data for the original Rogue River study, reflecting anticipated 
flood-control regulation from Lost Creek Dam, located 55.4 miles upstream from the city. 
Results of the hydrologic analyses were coordinated with the COE. Ending water-surface 
elevations at Savage Rapids Dam on the Rogue River were consistent with data furnished by 
the U.S. Geological Survey for the Jackson County Flood Insurance Study (Reference 1). 
On May 12, 1980, an intermediate meeting reviewing preliminary work done by the study 
contractor was attended by representatives of the study contractor, FEMA, the City of Cave 
Junction, and Josephine County. 
On May 27,1980, the results of the original study for the City of Grants Pass were reviewed 
at the final community coordination meeting attended by representatives of FEMA, the city, 
and the study contractor. No problems were raised at tlie meeting. 
A final coordination meeting for the City of Cave Junction and Josephine County was held 
on June. 3, 1981. The meeting was attended by representatives of the FEMA, the study 
contractor, the City of Cave Junction, and Josephine County. All problems raised at tlie 
meeting were resolved. 
Several flooding sourees within Grants Pass, including portions of the Rogue and Applegate 
Rivers,, and portions of Louse and Waters Creeks were selected for restudy at a meeting 
attended by representatives of FEMA,. Josephine County, the City of Grants Pass, and the 
study contractor on May 25,1988. Results of the hydrologic analyses performed by OTAK, 
Incorporated were coordinated with the COE, USGS, Soil Conservation Service, Oregon 
Department of Land Conservation and Development, and Josephine County. On September 
19, 1990, the results of the restudy were reviewed at the final community coordination 
meeting attended by representatives of FEMA, the city, and the study contractor. 
Countvwide Update 
An initial community coordination meeting for Josephine County was held on March 6, 
2006. This meeting was attended by representatives of the Cities of Grants Pass and Cave 
Junction, Josephine County, FEMA, and WEST Consultants, Inc. The results of the study 
were reviewed at the final Consultation Coordination Officer [CCO] meeting held on March 
5, 2009, and attended by representatives of the Cities of Cave Junction and Grants Pass, 
Josephine County, The Oregon Department of Land Conservation and Development and 
FEMA. All problems raised at that meeting have been addressed in this study. 
2 
2.0 . AREA; STUDIED 
2.1 Scope of Study 
This Flood Insurance Study covcrs the geographic area of Josephine County, Oregon, 
including the incorporated communities listed in Section l . l . 
The flooding sources studied by detailed methods in unincorporated Josephine County and 
the City of Cave Junction were selected with priority given to all known flood hazards and 
areas of projected development or proposed construction through 1985. Projected 
development or proposed construction were considered through 1995 within the City of 
Grants Pass. 
The limits of detailed studies in Josephine County were determined by FEMA with 
community and study contractor consultation at meetings in January 1978 and May 1988. 
Table 2 lists the flooding sources studied in detail and the included segments. River 
mileages used in this discussion are based on data published by the Hydrology Committee of 
the Columbia Basin Inter-Agency Committee (Reference 2). 
Table 2. Flooding Sources Studied by Detailed Methods 
Limits of Detailed Study 
From its confluence with the Rogue River to approximately 
4,000 feet upstream of Wildcat Gulch near Murphy. 
From a point approximately one mile southwes t of Selma (RM 
3.5) to Crooks Creek, 
From SW Rogue River Avenue to approximately 875 feet 
upstream from NW North Hill Drive. 
From the stream gaging station north ofKerby (near RM 50.0) 
to the confluence of the East and West Forks of the Illinois 
River. 
From its confluence with the Illinois River to approximately 
500 feet downstream from Sucker Greek near Cave Junction 
and from Little Elder Creek (RM 65.6) to Page Creek south of 
Takilma. 
From its confluence with the Illinois River to the Redwood 
Highway bridge and from a point 870 feet downstream from . 
Hugo Road at.O'Brien (RM 7.8) to a point approximately 2.4 
miles further upstream. 
From its confluence with the Rogue River to Monument Drive . 
near Merlin. 
From its confluence with Jumpoff Joe Creek to Granite Hill 
Road. 
From its confluence with the Applegate River to 
approximately 7,000 feet upstream from its mouth. 
Flooding Source 
1. Applegate River 
2. Deer Creek 
3. Gilbert Creek 
4. Illinois River 
5. East Fork 
Illinois River 
6. West Fork 
Illinois River 
7. Jumpoff Joe 
Creek 
8. Louse Creek 
9. Murphy.Creek 
Table 2. Flooding Sources Studied by Detailed Methods (continued) 
From Maple Creek near Galice (RM 75.2) to the Josephine-
Jackson County limits at Savage Rapids Dam.. 
From its confluence with the main stem of the Rogue River to 
its divergence from the main stem of the .Rogue River 
approximately 1,300 feet upstream from Lincoln Avenue. 
From its confluence with the Applegate River to 
approximately the intersection of Round Prairie Road and 
Redwood Highway. 
From its confluence with Slate Creek to approximately 6,200 
feet upstream from its mouth. 
Flows in Skunk Creek and Blue Gulch are well contained in rectified channels or 
underground conduits and were not included in the original study. 
The consultation meetings in January 1978 and May 1988 further identified flooding sources 
for which the extent of floodway analysis would be limited or excluded. The Rogue River 
floodway was determined only from Pass Creekdownstream of Grants Pass to the Josephine-
Jackson County boundary. The Louse Creek floodway analysis was terminated at a point 
2,100 feet downstream from the Interstate Highway 5 bridge. The detailed analysis of 
Murphy Creek did not include a floodway analysis. Floodway delineations were considered 
unnecessary in the areas already having multiple Federal, State, and eounty permit 
requirements for new construction (such as the area downstream from Pass Creek on the 
Rogue River). 
Approximate analyses were used to study flooding sources in areas having a low 
development potential or minimal flood hazards. The scopes and methods of analysis were 
proposed to, and agreed upon by FEMA, Josephine County, and the Cities of Cave Junction 
and Grants Pass. These analyses were adopted from previously effective flood hazard 
boundary, maps (Reference 3), Table 3 lists the flooding sources, grouped by watershed, 
which were studied by approximate methods. 
Table 3. Flooding Sources Studied by Approximate Methods 
1. Rogue River, Grave Creek, Wolf Creek,.Coyote Creek, Limpy Creek, and Dutcher 
Creek. 
2. Jumpoff Joe Creek, Quartz Creek, Bummer Creek, Bannister Creek, Schoolhouse 
Creek, and Haints Creek. 
3. Slate Creek, Cheney Creek, Murphy Creek, Williams Creek, Banning Creek, and 
the East and West Forks of Williams Creek. 
4. Peer Creek, Clear Creek, Draper Creek, Davis Creek, McMullin Creek, and Crooks 
Creek. 
5. Illinois River, West Fork Illinois River, Mendenhall Creek, Rough and Ready 
Creek, Elk Creek, East Fork Illinois River, Kelly Greek, Tycer Creek, Sucker Creek, 
Democrat Gulch, Mulvaney Gulch, Althouse Creek, and Altbouse Slough. 
10. Rogue River 
11. Rogue River 
Right Overbank 
12. Slate Creek 
13. Waters Creek 
4 
2.2 Community Description 
Josephine County is located in southwestern Oregon, sharing its southern boundary with the 
State .of California. Established in 1856, the county has an area of 1,625 square miles. 
Residential land development is present throughout the county due to the moderate climate 
and recreational features of the region. The estimated population of the county was 52,100 
in 1978 (Reference 4). The population as of the 2000 census was 75,726 (Reference 5). 
The climate of Josephine County is typical of other areas of Oregon west of the Cascade 
Range. The average July temperature is 71.2°F; hi January, the average temperature is 
39.9°F. The Klamath Mountain Range to the west provides a minor orographic barrier to 
winter storms moving inland from the Pacific Ocean. Heavy winter rainfall usually occurs in 
the interior valleys, and deep snow accumulates at the higher elevations of the Cascade, 
Siskiyou, and Klamath Mountain Ranges. The average annual rainfall varies from 
approximately 30 inches in Grants Pass to over 60 inches in the Siskiyou Mountains. The 
Cascade Range, far to the east, accumulates almost 80 inches of precipitation (Reference 6). 
Josephine County is drained almost entirely by the Rogue River and its two principal 
tributaries, the Applegate and Illinois Rivers. Steep, mountainous terrain lends , to rapid 
runoff when mild temperatures and heavy rainfall melt snow at theJiigher elevations. 
The Rogue River originates in the Cascade Range where the highest elevations exceed 8,000 
feet. The drainage area of the river as it enters Josephine County at Savage Rapids Dam is 
2,430 square miles. As the river flows westerly through the county, flood flows are fairly 
well contained by both banks until reaching the City of Grants Pass, 5.5 miles downstream of 
the dam. From Grants Pass to Finely Bend (9.9 miles west of the city), vast areas of low-
lying terrain are subject to severe flooding. From Finley Bend, the river meanders north of 
Jumpoff Joe Creek (8.5 miles downstream). In these reaches, flood flows are subject to 
natural bank constrictions which result in sizable ponding of water. Beyond Jumpoff Joe 
Creek, the Rogue River flows northwesterly toward the resort community of Galice. In this 
reach, flood flows are totally contained by steep canyon walls, especially at Hellgate Canyon 
and at an unnamed canyon-ending at Taylor Creek. In these canyons, flood flows become 
constricted.to a few hundred feet in width. Beyond Galice, the river continues its westward 
passage through the Klamath Mountain Range until it eventually reaches the Pacific Ocean. 
The Applegate River originates in the Siskiyou Mountains which form all but the northern 
boundary of the basin. The summit of the range reaches elevations of over 7,000 feet in 
some areas. The river enters Josephine-County from the southeast at a point 7.5 miles 
upstream from the small community of Murphy, The drainage area at a discontinued gaging 
station at the bridge in Murphy is 663 square miles. Flood flows in a sharply meandering 
channel inundate wide portions of the floodplain that lie upstream from natural constrictions. 
Five miles downstream from Murphy, the river passes through a short, narrow canyon. 
After leaving the canyon, o verbank flooding is moderate until the river becomes affected by 
backwater from the Redwood Highway (U.S. Highway 199) bridge near Wilderville. Here, 
extensive flooding occurs. Approximatély 0.6 miles downstream from the bridge, the 
Applegate River becomes affected by backwater from the Rogue River. The inundated 
Applegate River flood plain width exceeds 4,000 feet at its mouth (6.4 miles west of the City 
of Grants Pass). 
The eastern boundary of the Illinois River basin is also formed by the Siskiyou Mountains. 
The southern and western boundaries are formed by the Chetcò Divide of the Klamath 
Mountain Range. Summit elevations vary from 4,000 to 6,000 feet. The headwaters of 
Illinois River consist of two principal tributaries, the East and West Forks Illinois Ri ver. The 
5 
East Fork Illinois River enters Josephine County from the south at a point 3.9 miles upstream 
from the community'of Takilma. The drainage area at a gaging station located 0.3 miles 
north of the county limits is 42.3 square miles. General flooding occurs in most areas near 
Takilma except in a gorge east of the community. Farther north, extensive flooding occurs 
in the wide, flat floodplain downstream from the Redwood Highway Bridge near Cave 
Junction. The East Fork Illinois RiVer joins the West Fork Illinois River to form the main 
steiri of the Illinois River at the City of Cave Junction. 
The West Fork Illinois River also flows northerly into Josephine County at a point 7.1 miles 
upstream from the community of O'Brien. The drainage area of a gaging station located 
approximately 4 miles north of the county limits is 42.4 square miles. The most significant 
flooding in O'Brien occurs at the Redwood Highway Bridge, Overflow inundates portions 
of the community before re-entering the channel downstream from the bridge. Farther north, 
near Cave Junction, flooding is much more severe. Wide areas are inundated, especially near 
the drive-in theater located 2.5 miles south of the community. 
Below the confluence of its East and West Forks, the Illinois River flows northerly through 
fertile agricultural areas. Wide floodplains between Cave Junction and Kerby (2 miles to the 
north) become completely flooded. The flooding north of Kerby is equally severe, caused in 
part by a sharp bend in the river as it enters a narrow canyon. Beyond the mouth of the 
canyon (2.5 miles north of Kerby), the Illinois River continues westward through the 
Klamath Mountain Range until it meets the Rogue River at the summer resort community of 
Agness in Curry County, 50.2 miles downstream. 
Deer Çreek, a tributary of the Illinois River, is located entirely within Josephine County. The 
creek orijgihates in the Siskiyou Mountain foothills, south of Grants Pass, and flows westerly 
toward the community of Selma. The drainage area of the stream at a point 3.5 miles 
upstream from its mouth is 101 square miles. Flood plains in the Sehna area are low and flat. 
Extensive flooding occurs in this agricultural area. 
City of Cave Junction 
The City of Cave Junction is in the southwestern portion of Josephine County. The city, 
surrounded by unincorporated areas of Josephine County, is approximately 25 miles 
southwest of Grants Pass, Oregon, and 12 miles north of the Oregon-California State 
boundary. 
Cave Junction, incorporated, in 1948, is the second largest city in thé county, with an 
estimated 1978 population of over 800. Its population as of the 2000 census was 1,363 
(Reference 5), Residential development is present throughout the area due to the moderate 
climate and recreational features of the region. 
The climate of Cave Junction is typieal of other areas of Oregon west of the Cascade Range. 
The average July temperature is 71.2°F; in January, 39.3°F. The Klamath Range to the west 
provides a minor orographic barrier tb winter storms moving inland from the Pacific Ocean. 
.Heavy winter rainfall usually occurs in the interior valleys, and deep snow accumulates at 
higher elevations of the Cascade, Siskiyou, and Klamath Mountain Ranges. (Reference 6). 
Citv.of Grants Pass 
The City of Grants Pass is situated along the Rogue River in eastern Josephine County 
approximately 25 miles northwest of Medford, Oregon, and 30 miles north of the Oregon-
California State boundary. 
incorporated in 1887, Grants Pass is the county seat and had a population of23,023 as of the 
2000 census. The city extends across a 3-mile-wide valley and is bounded by densely 
wooded hills to the north and south. Fertile lowland areas support a sizable agricultural 
industry; timber and related byproducts are also important to the economy. Seasonal 
recreation fishing and character excursion trips on the Rogue River make Grants Pass a very 
popular tourist center. 
The Rogue River floodplain within the city has areas of dense residential and commercial 
development. Aerial photographs show that some small tracts of land are undeveloped, but 
local land use measures may dictate the type and extent of future development. Gilbert 
Creek has a very high density of residential development. 
The drainage area of the Rogue River at the gage in Grants Pass is 2,459 square miles. The 
river originates in the Cascade Range, where heavily forested slopes reach elevations 
exceeding 8,000 feet. These steep slopes usually accumulate heavy winter, snowfall, and 
storm runoff is rapid when mild temperatures and sustained rainfall occur during the passage 
of a. Pacific storm front. An exception to this general runoff characteristic occurs above an 
elevation of 5,000 feet in the vicinity of Crater Lake. Highly permeable pumice soils and 
lava formations allow much of the rainfall and snowmelt to infdtrate the ground, thus 
reducing surface runoff (Reference 7). 
The drainage area of Gilbert Creek is 5.68 square miles at its mouth. The creek originates in 
the foothills north of the city, where the highest elevation is approximately 3,100 feet. The 
channel gradient is very steep until reaching the city, and peak flows usually occur within 
hours after the passage of a storm front. 
Topography varies from the steep, forested slopes of Blue Gulch in the northwestern part of 
the city to the more gently sloping floodplain of the rest of Grants Pass. Elevations range 
from approximately 900 feet along the Rogue River to over 1,500 feet in the northwestern 
portion of the city (Reference 8). 
The average annual temperature is 54°F, with historic extremes ranging from 114°F in 1928 
to -l°F in 1972 (Reference 9). Average annual rainfall varies from approximately 30 inches 
in the vicinity of Grants Pass to almost 80 inches in the extreme northeastern corner of the 
basin near Crater Lake (Reference 6). 
2.3 Principal Flood Problems 
Abnormally heavy or prolonged rainfall, sometimes combined with snowmelt and frozen or 
nearly saturated ground, may cause flooding in Josephine County. 
AU streams in Josephine County usually respond to the same storm event, but the 
quantitative response can vary considerably. For example,1 most steams reached record 
stages during the devastating floods of December .1964; peak stages oh the Applegate River, 
although high in 1964, were exceeded in January 1974. 
7 
A comparison of historical floods at gaging stations must consider the possibility of changes 
that might occur in the stream channels between storm events. The scouring of a stream 
channel' could result in the greater flood having a lower recorded elevation. 
Flood flows tend to attenuate as they move downstream due torthe lessening of the channel 
gradient and to the storage of water ¡n the flood plains. Gaging-station records collected in 
the upper part of a basin are, therefore, seldom representative of the runoff characteristics in 
the lower basin. 
The largest flood in recent times occurred on the Rogue River on December 23, 1964. A 
peak flow of 152,000 cubic feet per second (cfs) inundated large residential areas in and 
around the City of Grants Pass. A stonn hydrograph at the Grants Pass gaging station 
showed the maximum stage was reached within 2 days after the initial raise in stage, and 
overbank flows remained for almost 4 days after the peak occurred. Antecedent 
climatological conditions were: 90 inches of snow had accumulated at Crater Lake by 
December 21, the freezing level rose to ì 1,000 feet on December 22, and rainfall totaled 8 to 
10 inches at several reporting stations on December 21 and 22, The Crater Lake snow depth 
decreased to 68 inches by December 23 with a loss of 4 to 5 inches in water content 
(Reference 10). Downstream from the city to approximately Finley Bend, thousands of acres 
of productive farmland were under as much as 10 feet of water. Severe erosion and siltation 
occurred, and extensive irrigation systems were déstroyed. It is estimated that 360 
residences, 19 commercial establishments, and 2 industries were damaged in this area 
(Reference 10). 
Downstream from Finley Bend, the river meanders in and out of deep canyons where 
development consists of ranches, summer homes, and recreational facilities. In December 
1964, it is estimated 70 residences were flooded, and 18 were completely destroyed 
(Reference 10). 
Based on 38 years of records collected at a gaging station in Grants Pass, it is estimated that 
a flood of that magnitude would have occurred on the average of once every 5 0 years prior to ' 
the construction of Lost Creek Dam. It would now occur on the average of once every 120 
years with anticipated flood regulation in effect (Reference 11). 
In the past 120 years, the December 1964 flood is believed to have been exceeded twice in 
Grants Pass. The U.S. Army Corps of Engineers estimates a flood in December 1861 had a 
discharge of 175,000 cfs; in February 1890, 160,000 cfs (Reference 10). They estimated 
that, due to upstream storage, discharges of that magnitude would now occur on the average 
of once every 180 years and 140 years, respectively (Reference 11). 
Gilbert Creek in Grants Pass is ungaged and quantitative historical high-flow data are 
unknown. Residents living adjacent to the channel have observed road overflow at various 
culverts throughout the city. There is severe channel encroachment in many areas due, in 
part, to vertical retaining walls built at the edge of the low-water channel. A house on L 
Street spans the channel and will obstruct high flows. 
On the Applegate River, the largest peak recorded at a gaging station located 1.8 miles 
southeast of the Town of Applegate in Jackson County occurred on January 15, 1974. A 
peak discharge of37,200 cfs exceeded the December 22,1964 peak of2,500 cfs. Extremely 
unstable channel conditions make an exact comparison of instantaneous peak flows 
impossible, and revisions of previously published data have been necessary. 
Flood damage to agricultural lands was extensive, but most of the damage occurred in areas 
8 
upstream from the Town of Murphy.Tt'is estimated that 2900 acres of productive farmland 
were inundated (Reference 12). Most of tlie residential damage occurred downstream from 
Murphy when the river scoured a sharp bend and inundated almost 200 acres. 
Based on 38 years of data collected at the Applegate gaging station, it is estimated that a 
flood of the magnitude, of the 1974 peak would reoccur on the average of once every 20 
years. Now that the Applegate Reservoir is completed, the recurrence interval has been 
lengthened. 
The largest flood on Slate Creek occurred on December 22, 1964. A peak flow of4,650 cfs 
was recorded at a gaging station located 3.6 miles upstream from the community of 
Wilderville. Flood damage was not extensive because of the sparse population at that time. 
Based on 19 years of data collected at the gage, a flood of this magnitude would reoccur on 
the average of once every 8 years. 
The largest flood recorded in the Illinois River basin occurred on December 22, 1964. Two 
gaging stations located in the upper basin near Takilma and O'Brien indicated unit runoff 
values of approximately 380 cfs. per square mile, instantaneous peak flows were 15,700 cfs 
near Takilma and 16,100 cfs near O'Brien. A gaging station loeated in the lower part of the 
basin near Kerby had a peak flow of92,200 cfs and a unit runoff of approximately 240 cfs 
per square mile. The above unit runoff values are the'highest ever recorded in Josephine 
County. 
Because of the sparse population at the time, flood damage primarily involved highway 
bridges and agricultural land. Water depths of over 15 feet covered the Redwood Highway 
north of ICerby, Some homes were observed floating away from their foundations during the 
flood. 
Based on 15 years of records collected at the gaging station on Illinois River near Kerby, it is 
estimated a flood of this magnitude would occur on the average of onee every 150 years. In 
the upper basin where the flood runoff was more intense, the recurrence interval is estimated 
to be 500 years at Takilma and 300 years at O'Brien. The Takilma gaging ¡station has 39 
years of record; O'Brien, 22 years. 
Extensive flood damage also occurred in the small tributaiy basins of Josephine County. 
Deer Creek, Jumpoff Joe Creek, and Louse Creek, although ungaged, had the highest flows 
ever observed during the December 1964 storm. Many drainage structures were damaged, 
resulting in the disruption of traffic. Fannland on the narrow terraces of the valleys suffered 
erosion and silt accumulations. Without streamflow data, it is not possible to derive statistical 
flow data for this flood. 
2.4 Flood Protection Measures 
There are two functioning flood-control reservoirs in the basin. Lost Creek Dam, located 
55.4 miles upstream from the gage in Grants Pass, will reduce, the magnitude of peak-flow 
events. It is estimated that a flood of the magnitude of the 1964 Rouge River flood would 
have occurred approximately once every .50 years prior to the construction of Lost Creek 
Dam. It should now occur on the average of approximately once every 120 years with 
existing flood regulation in effect. Due to upstream storage, discharges of the magnitude of 
the 1861 and 1890 Rogue River floods would now occur approximately once every 180 
years and 140 years, respectively (Reference 13). Applegate Reservoir on Applegate River 
9 
is also located in Jackson County, 33.6 miles upstream from the community of Murphy. 
Construction of Elk Creek Dam began in 1986 and ceased in 1988. The completed portion 
of the dam was subsequently breached beginning in July 2008. No flood control is provided 
by the remaining structure. 
There are no extensive levee systems in the county. Some private interests have constructed 
dikes adjacent to their property; their capability of withstanding sizable flood events is 
unknown. 
ENGINEERING METHODS 
For the flooding sources studied by detailed methods in the community, standard hydrologic and 
hydraulic study methods were used to determine the flood-hazard data required for.this study. Flood 
events of a magnitude that are expected tó be equaled or exceeded once on the average during any 
10-, 50-, 100-, or 500-year period (recurrence interval) have been selected as haying special 
significance for floodplain management and for. flood insurance rates. These events, commonly 
termed the 10-, 50-, 100-, and 500-year floods, have a 10-, 2-, 1-, and 0.2-percent chance, 
respectively, of being equaled or exceeded during any year. Although the recurrence interval 
represents thè long-term, average period between floods of a specific magnitude, rare floods could 
occur at short intervals or even within the same year. The risk of experiencing a rare flood increases 
when periods greater than 1 year are considered. For example, the risk of having a flood that equals 
or exceeds the 100-year flood (1-percent chance of annual exceedence) in any 50-year period is 
approximately 40 percent (4 in 10); for any 90-year period, the risk increases to approximately 60 
percent (6 in 10). The analyses reported herein reflect flooding potentials based on conditions 
existing in the community at the time of completion of this study. Maps and flood elevations will be 
amended periodically to reflect future changes. 
3.1 Hydrologic Analyses 
Hydrologic analyses were carried out to establish peak discharge-frequency relationships for 
each flooding source studied by detailed methods affecting the community. 
Federal Emergency Management Agency standards require Flood Insurance Studies in 
adjacent areas to use consistent hydrologic analyses. Accordingly, the hydrology of the 
Rogue River in Josephine County is identical to that used in the Jackson County Flood 
Insurance Study (Reference 1). The U.S. Aiiny Corps of Engineers has since revised that 
hydrology (Reference 11) as shown in the following table (discharges are in cfs). 
Discharges 
Flood Event Josephine County Revised Hydrology 
10-percent-annuaI-chance 73,000 70,000 
2-percent-annual-chance 128,000 120,000 
1-percent-annual-chance 144,000 . 153,000 
1 0.2-percent-annual-chance 260,000 280,000 
Both sets of data are based on 38 years of stream flow records collected at Grants Pass 
gaging station (1939-1976). Thè discharges are adjus ted for expected probability and include 
anticipated flood-control regulation from Lost Creek Dam. The revised values are still within 
the 90 percent confidence limi ts of the original values. The regulating effect of the proposed 
Elk Creek Dam currently in development by the COE has been evaluated. 
10 
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Construction of Elk Creek Dam ceased in 1988. The completed portion of the dam was 
subsequently breached beginning in July 2008. No flood control is provided by the 
remaining structure. However, since the regulated discharges, including the anticipated 
benefit of the Elk Creek facility, were found by OTAK, Inc. to fall within-the 90 percent 
confidence interval of the unregulated discharges (i.e., without the Lost Creek and Elk Creek 
facilities), no changes were made to the discharges shown in the Summary of Discharges 
(Table 4). 
The U.S. Army Corps of Engineers also provided concordant flood control from both Lost 
Creek and Applegate Reservoirs. The Applegate River data were based on records collected 
over an 18-year period at a discontinued gaging station near Wilderville. 
The magnitude of the design floods on Slate Creek, and Illinois, East Fork Illinois, and West 
Fork Illinois Rivers was derived by using a log-Pearson Type III probability distribution 
(Reference 14) of the gaging station data referred to in Section 2.3. A generalized skew 
coefficient was determined from U.S. Water Resources Council Bulletin 17 (Reference 15). 
Discharges at sites within 5 to 25 percent of the gaging station drainage area were estimated 
using the following transfer formula: 
Q„ = Q g ( A u / A g ) n 
Where "Qg" and "Ag" are the discharge and drainage area at the gage, "Qu" and "A«" are the 
discharge and drainage area at the ungaged location, and the exponent "n" is an exponent 
derived from regional flood-frequency equations published in the U.S. Geological Survey 
Flood-Frequency Analysis for Western Oregon (Reference 16). 
Design floods at all other ungaged sites were determined using the flood-frequency equations 
included in the western Oregon analysis. The 0.2-percent-annual-chance flood equation for 
the Rogue River basin, not included in that report, is: 
Q o m & O Q ) = 1 0 5 A ° ' 9 l ( S T + l ) ' l - 2 6 i l M 
Where "A" is drainage area in square miles, "ST" is the area of lakes and ponds (in percent), 
and'T' is the rainfall intensity (2-year, 24-hour) in inches. 
The Gilbert Creek hydrology is based on 25 years of peak-flow data collected at a gaging 
station on Jones Creek, a small basin east of the the City of Grants Pass with headwaters 
adjoining Gilbert Creek, Jones Creek has .a drainage area of 7.41 square miles at a gaging 
station located at the culvert entrance on Interstate Highway 5. The discharges.used in this 
study were computed using a direct drainage area ratio of the two basins even though runoff 
in the urban areas of Gilbert Creek may differ from the rural runoff in the Jones Creek basin. 
If was beyond the scope of this study to conduct a detailed study of the effects of the storm-
sewer inflows within the city. 
In order to determine the magnitude of the design floods on Jones Creek, the 25 years of 
peak data were used in a log-Pearson Type III probability distribution, with a generalized 
skew coefficient determined from the U.S. Water Resources Council Bulletin 17 (Reference 
15). The USGS computer program J-407 (Reference 14) detected no low outliers, and the 
discharges were not adjusted for expected probability. 
14 
'The Gilbert Creek drainage area was determined on the basis of drainage maps provided by 
'tJie City of Grants Pass (Reference 17) and by a USGS topographic map (Reference 8). 
The 1989 OTAK, Inc. analysis computed flows for Louse Creek and Waters Creek using the 
USGS equations in the publication entitled "Magnitude and Frequency of Floods of Western 
Oregon" (Reference 16). The 0.2-percent-annual-chance Q equation, describe above, was 
also used. Salt Creek enters Waters Creek approximately one-half mile upstream of Waters 
Creek mouth. The hydrologic analyses for the upper portion of the Applegate River were 
conducted using records from the 42-year period of unregulated flow (i.e., 1939-1980) at the 
USGS gagingstation near Applegate (No. 14366000) and the regulated flow curves provided 
by the COE. The accepted regulated discharges (i.e., regulation due to the Applegate Dam) 
were projected to additional locations of interest upstream of Wildcat Gulch near Murphy 
using the flow transfer formula described above. Peak discharge information was provided 
for the 10-, 2-, 1-, and 0.2-percent-annual-chance floods on the Applegate River, although 
only the 1-percent-annual chance flood profile was computed. 
Hydraulic Analyses 
Analyses of the hydraulic characteristics of flooding from the sources studied were carried 
out to provide estimates of the elevations of floods of the selected recurrencc intervals-Users 
should be aware that flood elevations shown on the Flood Insurance Rate Map (FIRM) 
represent rounded whole-foot elevations and may not exactly reflect the elevations shown on 
the Flood Profiles or in the Floodway Data tables in the FIS report. Flood elevations shown 
on the FIRM are primarily intended for flood insurance rating purposes. For construction 
and/or floodplain management purposes, users are cautioned to use the flood elevation data 
presented in this FIS report in conjunction with the data shown on the FIRM. 
Water-surface elevations were estimated at all cross sections by a computer program that 
computes energy losses between sections, using conservation-of-energy equations (step-
backwater analysis! This hydraulic model requires accurate measurements of channel cross 
sections, bridge and dam geometries, and a proper evaluation of the roughness of the main 
channel and floodplains. The water-surface elevations at each cross section were determined 
by using the U.S. Geological Survey computer program E-431 (Reference 18). 
Locations of selected cross sections used in the hydraulic analyses are shown on the Flood 
Profiles (Exhibit 1). For stream segments for which a floodway was computed (Section 4.2)j 
selected cross section locations are also shown on the FIRM. 
Channel and cross section properties were determined by photogrammetiy based on aerial 
photographs taken September. 3.0, 1978 (Reference 19). Bridge geometries and the 
underwater portion of the cross sections were surveyed in January 1979. Roughness 
coefficients (Manning's "n") were based on field observation and aerial photographs. The 
range of roughness values used for all floods is shown in Table 5. 
Table 5. 
Flood Source 
Applegate River 
Deer Creek 
Gilbert.Creek 
Range of Manning's Roughness Values 
Main Channel Flood Plain 
0.032-0.042 . 0.032-0.080 
0.034-0.045 0.035*0.080 
0.032-0.055 0.035-0.085 
15 
Table 5. Range of Manning's Roughness Values (continued) 
Illinois River 0.038-0.065 
0.045-0.050 
0:038-0.042 
0.050-0.065 
,0.040-0.0,45 
0.035-0.055 
0.045-0-.060 
0.034-0.080 
0.034-0.080 
0.034-0.080 
0.034-0.080 
0.034-0.080 
0.035-0.080 
0.050-0.080 
canyons near Kerby 
Sours Flat area 
near Pomeroy Dam 
gravel & rock areas. 
East Fork Illinois River 
West Fork Illinois River 
overflow reach near 0.035-0.070 0.040-0.080 Lone Mountain Road 
Jumpoff Joe Creek 
Louse Creek 
Murphy Creek 
Rogue River 
through Grants Pass 
Slate Creek 
Waters Creek 
0.032-0.055 
0,033-0.048 
0.045-0.050 
0.030-0.065 
0.031-0.038 
0.032-0.055 
0.030-0.070 
0,032-0.100 
0.035-0.080 
0.045-0.080 
0.032-0.09Ô 
0.031-0.200 
0.038-0.150 
0.038-0.110 
The initial water-surface elevations for the flood profiles on the Rogue River were derived 
from a step-backwater .convergence study.made through a five-section reach ending at cross 
section A. (Reference 20). Profile convergence was attained for each of the prescribed flows 
by using the U.S. Geological Survey computer program E-431. 
The computation procedure requires a uniform change in channel conveyance between cross 
sections. Also, in rapidly expanding reaches, the program assumes 50 percent of the energy 
is recovered between sections (due to uncertain eddy losses). Program E-431 became invalid 
at the outlet of two narrow canyons where chute flows and hydraulic jumps occurred (cross 
sections R and AB). Therefore, water-surfaee profiles through these canyons were 
estimated, and the hydraulic model was reset at the eanyon entrances using elevations 
derived by slope-conveyance studies. 
Both Hellgate and Robertson bridges are built well above the 0.2-percent-annual-chance 
flood levels, and neither would constrict the flows. 
The main channel varied from long calm reaches of silt, interlaced with boulders, to the 
bedrock outcrops of Hellgate Canyon. Flood plain vegetation varied from smooth, after-
harvest hqp fields to dense, forests. 
The Rogue River floodway analysis began at.cross section BU. The initial 1 -percent-annual-
chance flood elevation for the floodway was taken directly from the normal profile computed 
for the cross section. Because encroachment was not allowed downstream from cross section 
BU, no surcharge was computed for that cross section. 
The hydraulic analyses of the reach of the Rogue River in Grants Pass began at a point 
approximately 2.3 miles downstream of the city, where the overbank flow breakout returns 
to the channel. Photographs of the 1964 flood revealed that there was divided flow 
downstream of the city. The December 1964 flood discharges in Grants Pass (152,000 eft) 
closely approximated the published 1-percent-annual-chance discharge of 144,000 cfs, This 
16 
discharge resulted in well-defined overflows at the sewage treatment plant and at the 
RogueHa Mobile Home Park. 
The initial hydraulic analyses were conducted to identify the various flow behaviors. Three 
distinct flow patterns occurred; 
1. The 10-percent-annual-chance flow was contained in the channel. 
2. The 2- and 1-percent-annual-chance floods caused overflows on the right bank. 
3. The 0.2-percent-annual-chance flood completely inundated the floodplain, 
An iterative hydraulic analysis for divided flows around the islands was undertaken to 
determine the flow distribution. In order to assess the significance of the overflows, survey 
data .were collected to describe the control section over which these overflows would occur. 
These data were subsequently incorporated into the hydraulic model using the HEC-2 
divided flow option. The hydraulic analyses required flow and water-surface elevation 
balances between the main stem and the north overbank at three different locations. 
The results of the analysis were then compared with the 1964 flood photographs. It was 
identified that overbank flow returned to the channel at a point located approximately 2.3 
miles downstream of the sewage treatment plant. 
Surveys of typical cross sections for both the channel and the north overbanks were 
conducted and then compared to data used in the existing Flood Insurance Study hydraulic 
model of July 1980. It was determined that the variations between the old cross sections and 
the recently surveyed cross sections were less then one foot. Therefore the existing cross 
sectional data were retained for profile computations. Water-surface elevations of floods of 
the selected recurrence intervals were computed through use of the COE HEC-2 step-
backwater computer program (Reference 21). 
The 1-percent-annual-chance profile on the. Rogue River agreed favorably with many 1964 
high-water marks found throughout the study area. However, an exact comparison of 
profiles is impossible in the lower reaches because of ungaged tributaiy inflow during the 
1964 flood. 
There was a small disagreement on the Rogue River between the computed profile elevations 
and elevations determined from a stage-discharge relation at a gaging station in Grants Pass. 
A minor adjustment was, therefore, prorated from the gage to.the Seventh Street bridge, 0.6 
mile downstream. 
The 1989 restudy of the Rogue River analyzed the reach from a point approximately 3.5 
miles downstream of the South 6th Street Bridge in Grants Pass to apoint 2.2 miles upstream 
of the South 6th Street Bridge. The restudy included the proposed Redwood Highway 
crossing. The hydraulic study was conducted by the Oregon Department of Transportation's 
Hydraulic Division and was provided by FEMA to OTAK, Inc. 
The restudy used discharge values based on the original values used in the Josephine County 
Flood Insurance Study of December 1* 1981, which included the regulating effect of the 
proposed Elk Creek. Dam, soon to be completed by the COE. The regulated discharges 
include most of the anticipated benefit for the Elk Creek facility and were found to fall 
within the 90 percent confidence interva I of the unregulated discharges (i.e., without the Lost. 
Creek and Elk Creek facilities). The original cross sectional'geometry and roughness 
17 
coefficients for the Rogue River restudy were retained from the original modeling for the 
restudy computations. Known elevations from the effective modeling were used for the 
startingwater surface elevations of the restudy reach. The selected recurrence intervals were 
•computed using of the COE HBC-2 step-backwater computer program (Reference 21). 
Photographs of the 1964 flood of the Rogue River at the Qty of Grants Pass revealed 
divided flows around the islands located just downstream of thCcity. To determine the flow 
distribution, the split-flow option of HEC-2 was used. It was identified that the right 
overbank flow returned to the channel approximately 2.3 miles downstream of the municipal 
sewage treatment plant, 
The resulting water surface elevations matched within 0.2 feet of those published previously. 
The floodway analysis for the Rogue River restudy was computed using the full 1-percent-
annual-flood discharge assuming no breakout flows. 
Flood profiles for Gilbert Creek began at the culvert on Rogue River Avenue, the first point 
where energy controls would not be influenced by backwater from the Rogue River. The 
initial water-surface elevations were determined from composite stage-dischargc relation 
computed at the culvert entrance. 
A composite stage-discharge relation is a graphic presentation that combines the amount of 
water flowing through the culvert with the amount flowing over the road, then relates the 
total flows to an upstream water-surface elevation. Flows through 23 Gilbert Creek culverts 
were computed using USGS computer programs E-431 and A-526 (Reference 18 and 22). 
Most road overflow situations involved flat street surfaces where flow direction was difficult 
to determine. Where unconfmed overflow occurred, the effective width was based on either 
the upstream channel geometry or the location of houses and garages in the approach section. 
In all cases, the amount of road overflow was computed using coefficients published in the. 
USGS Techniques of Water-Resources_Inyestigations (Reference 23). 
Storm-sewer inflows were estimated at West B Street and at Hillcrest Drive using outlet pipe 
diameters and by assuming the pipe gradient was equal to the ground slope to the nearest 
manhole structure. Resultant discharges were derived from the Manning equation for pipe 
flow as given in King's Handbook of Hydraulics (Reference 24). 
Both Gilbert Creek and Jones Creek have a trans-basin irrigation canal in the upper basin. 
The Tokay Canal diversion from the Rogue River is at a pumping station at Savage Rapids 
Dam, located 6.1 miles, upstream from the Grants Pass gaging station. The canal 
contribution to flood flows is uncertain because some flows can enter the basin as spillage 
from the canal. The ditch capacity at the pumping plant is 47 cfs, but the capacity Upstream 
from Hawthorne Avenue is only 27 cfs. This study assumes ditch flows are negligible 
during peak events. 
Flood profiles were drawn showing computed water-surface elevations to an accuracy of 0.5 
foot for floods of the selected recurrence intervals (Exhibit 1). 
Initial water-surface elevations for the profiles on Jumpoff Joe Creek reflected concordant 
flows of the Rogue Ri ver. The 1-percent-annual-chance flood elevations on Rogue River 
extended 2.2 miles up the Jumpoff Joe Creek channel. The initial water-surface elevation 
used for the floodway analysis was estimated from a slope-conveyance study that did not 
consider concordant flow or backwater. The Jumpoff Joe Creek profiles continued 
uninterrupted past the confluence of Louse Creek in Merlin. An increase in channel gradient 
18 
upstream from Merlin made it necessary to establish additional cross sections. These cross 
sections were estimated by interpolating "between the geometries of the (Wo nearest cross 
sections, and by using a map having 4-foot contour intervals (Reference 19). 
Supercritical flow situations were encountered at three cross sections. Each situation 
required a resetting of the model using critieal-depth elevations for each of the prescribed 
flows. ; 
. At Russell Road, the 0.2-pereent-annual-chance flood overflowed the highway at a point 800 
feet south of the bridge. A composite flow situation could not be computed because the flow 
in the main channel and flow in the overflow section did not share a common headwater 
elevation. Road overflow was estimated. 
The main channel consisted of gravel and small boulders and the oyer bank areas varied from 
pastures to dense forests. 
The initial water-surface elevations for profiles on Louse Creek were headwater elevations 
computed for the railroad bridge in Merlin. The headwater elevations were manually 
computed from a critical-depth section at the outlet of the bridge. Exact discharge values 
could not be determined because of unknown inflow from Harris Creek, a large tributary 
with a bridge 450 feet north of the Louse Creek channel. There is an exchange of flow 
between the two channels via a large ditch at the toe of the railroad embankment. An 
apportionment of flow through each structure could not be made because there is no common 
headwater elevation due to the lateral slope of the terrain. For the purpose of this study, it 
was assumed no peak flow exchange occurs during flooding. 
The 1-percent-annual-chance flood on Louse Creek was found to be contained within the 
main channel except at the railroad bridge in Merlin and at a bridge on Monument Drive. A 
portion of the Louse Creek floodplain, downstream of Monument Drive, was found to be 
susceptible to 1-percent-annual-chance sheet flow, a condition of overland flow where 
elevations and directions of flow are difficult to determine. Small embayments at the mouths 
of tributaries also would experience flooding. A floodway was designed to oceupy the entire 
width of the 1 -percent-annual-chance floodplain because any encroachment on the main 
channel would increase the stream velocities and aggravate bank erosion. Supercritical flow 
occurred at 18 cross sections in this reach. 
Because of the steep channel gradient, 21 additional cross sections were needed to define a 
continuous profile. The additional cross sections were estimated as described in the Jumpoff 
Joe Creek discussion. 
Approximately 30 percent of the I-percent-annual-chance flood flow on Louse Creek 
bypasses the bridge at Monument Drive at a point 600 feet north of the channel. The flow 
capacity of the bridge would not allow any encroachment on the flood plain, and a floodway 
analysis was not attempted. 
The channel consisted of gravel and cobbles, with some overhanging brush, and overbank 
values ranged from pasture grass to dense forest. 
The. 1989 study by OTAK, Inc. extended the portion of detailed study for Louse Creek by 
adding a reach extending from approximately 4.70 feet downstream of Monument Drive 
upstream to its crossing of Granite Hill Road, a distance of 2.9 miles. The starting water 
19 
surface elevation for the extended reach was based on known elevations froin;the effective 
modeling. Channel and cross section properties were surveyed between February and Juue 
of 1989. Water-surface elevations of floods of the selected recurrence intervals were 
computed through use of the COE HEC-2 step-backwater computer program (Reference 21). 
The average fall of Louse Creek throughout the study reach was approximately 90 feet per 
mile. This steep slope resulted in many supercritical flow conditions even though surveyed 
cross sections were taken at an average interval of 600 feet along the creek, Because of the 
steep channel gradient; 24 additional cross sections were added to the hydraulic model. 
Overall, the l-percent-annual-chance floodplain width on the upper Louse Creek varied from 
50 feet to 1,000 feet. 
Because of the steep channel gradient for Louse Creek, the equal conveyance encroachment 
option that operates on the energy gradelirie was used for the floodway analysis. This 
method is suggested for steep waterways since it will not allow unreasonable encroaehments. 
The resulting floodway widths varied from 30 feet to 230 feet. 
The flood profiles for Applegate River began at its confluence with the Rogue River. Initial 
water-surface elevations were based on coneordant flows where backwater extended 1,180 
feet up the Applegate River channel. The initial water-surface elevation for the floodway 
analysis was determined from a stage-discharge relation established at cross section BZ on 
Rogue River and does not consider coneordant flow or backwater. 
A natural constriction at cross section Z caused a supercritical flow situation for the 0.2-
per cent-annual-chance flood. The change in the state of flow caused an unrealistic shape in 
the stage-discharge relation, and the 0.2-percent-annual-chance elevation was, therefore, 
estimated by extrapolating the rating curve. 
Supercritical flows were also encountered at a low diversion dam at the mouth of Murphy 
Creek. The hydraulic model was reset using elevations derived by critical-depth 
computations. A direct weir formula could not be used because of excessive bypass flow 
around the ends of the dam. 
The bed material of Applegate River varies from areas of unstable gravel and rock deposits 
to bedrock outcrops overlain by boulders and gravel. Much of the reach is subject to change 
due to scour and filling of bed material and to gravel mining. Floodplain vegetation varied 
from pasture grass to dense deciduous brush. On the south bank at cross section AE, an 
upstream bank projection would cause a portion of the cross section to become ineffective 
for transmitting flows due to a large eddy current. An unrealistically high V value was 
therefore assigned to reduce the conveyance in that portion of the cross section. 
The 1989 OTAK, Inc. analysis extended the Applegate River study from the previous 
upstream limit of detailed study to the Josephine-Jackson County line, an addition of 
approximately 5.6 miles. Known water surface elevations from the effective modeling were 
used as the downstream boundary for the extended modeling. Gross section properties were 
surveyed between February and June of 1989. Water-surface elevations of floods of the 
selected recurrence intervals were computed through use of the COE HEC-2 step-backwater 
computer program (Reference 21). No floodway was computed as a part of the 1989 
analysis due to the lack of development pressure. 
The average fall of the Applegate River throughout the 1989. study area was approximately 
17 feet per mile. With surveyed cross sections taken at an average interval of one every 
3,000 feet, many critical depth statements were encountered during the initial hydraulic 
20 
simulations. This problem was solved By using the interpolated cross sections option of the 
HEC-2 model. Approximately 21 cross sections were automatically inserted by the 
hydraulic model throughout this reach of the Applegate. Overall, the 1-percent-annual-
chance floodplain width on the limited detail study portion of the Applegate varied from 
l,200.feefto 2,700 feet. ' 
Initial water-surface elevations for profiles on Slate Creek reflect concordant flows of 
Applegate River. Backwater extended 5,500 feet up the Slate Creek channel. The initial 
elevation for the Slate Creek floodway analysis was determined by a slope-conveyance study 
through the first five cross sections of the reach (to cross section C). Concordant flow with 
backwater was not a consideration for the floodway analysis. Main channel bed material 
consisted of areas of rock and gravel deposits interlaced with boulders. The upper reach 
consisted of bedrock outcrops and boulders. Floodplain vegetation varied from moderate to 
extremely dense brush and tree growth. 
Waters Creek, a small tributary to Slate Creek, was studied by OTAK, Inc. in 1989 from its 
confluence with Slate Creek upstream for a length of approximately I mile. The starting 
water-surface elevation was computed using the slope-area method. The backwater 
elevations from Slate Creek at the confluence were computed based on a normal depth 
approximation for Slate Creek using a discharge computed from the flow/area transfer 
formula (Reference 16). The Waters Creek confluence is located approximately 3 miles 
upstream of the confluence of Hound Prairie Creek, Channel and cross section properties 
were surveyed between February and June of 1989. Water-surface elevations of floods of 
the selected recurrence intervals were computed through use of the COE HEC-2 step-
backwater computer program (Reference 21). The average fall of Waters Creek throughout 
the study reach was approximately 50 feet per mile. This steep slope resulted in many 
supercritical flow conditions, even though surveyed cross sections were taken at an average 
interval of 300 feet along the creek. Because of the steep channel gradient, 17 additional 
cross sections were added to the hydraulie model. Overall, the 1-percent-annual-chance 
floodplain varied from 80 feet to 420 feet, 
Because of the steep channel gradient for Waters Creek, the equal conveyance encroachment 
option that operates on the energy gradeline was used for the floodway analysis. This 
method is suggested for steep waterways since it will not allow unreasonable encroachments. 
The resulting floodway widths varied from 30 feet to 100 feet. 
Initial elevations for the design-flood profiles for Murphy Creek were determined from a 
slope-conveyance study in the lower reach where all but the 0.2-percent-annual-chance flood 
were well contained in a rectified channel. A floodway analysis was not required on Mutphy 
Creek. Headwater elevations at the Southside Road bridge were computed using the U.S 
Geological Survey computer program A-526 (Reference 22). Supercritical flows were 
encountered at two cross sections (E and 1), and the model was reset using critical-depth 
elevations at each cross section. The.0.2-percent-annual-chance flood overflows Southside 
Road near the intersection of Williams Highway. Bypass flows then merge with Applegate 
River and do not re-enter thé Murphy Creek channel. The extent of road overflow was 
estimated because a composite stage-discharge relation could not be established at the 
bridge. 
Murphy Creek main-channel bed material consisted of loose rocks and boulders, and 
floodplain vegetation consisted of areas of unimproved pastureland, and moderate to dense 
brush and tree growth. 
21 
The flood profiles for the Illinois River began at a point 300 feet downstream from a gaging 
. station near ICerby (No. 14377100). The stage-discharge relation developed at the gage was 
used to determine initial elevations. The velocity distribution in a vast ponding of water at 
Sauers Flat, upstream from the gage, is uncertain due to eddy currents and slack water. The 
limits of the effective velocities were then estimated until upstream.profile elevations agreed 
with a stage-discharge relation established at a discontinued gaging station (No. 1437000) 
located at the Finch Road bridge in ICerby^  3.6 miles upstream from the .initial cross section. 
A low diversion dam near Cave Junction (Pomeroy Dam) was completely submerged by all 
flows and did not affect profile elevations. As previously mentioned, the computation of 
flood profiles continued uninterrupted up East Fork Illinois River to Sucker Creek. As the 
Illinois and East Fork Illinois Rivers were treated as essentially one river, cross section 
locations on the East Fork Illinois River refer to the starting point of the profiles, Illinois 
River Mile 50.0, approximately 6.4 miles downstream from the confluence of the Illinois, 
East Fork Illinois, and West Fork Illinois Rivers. 
Cross section data for Illinois and East Fork Illinois Rivers were obtained from 
photogrammetry based on aerial photographs taken on September 30,1978 (Reference 19). 
Bridge geometry and underwater portions of the cross sections were surveyed in January 
1979. 
There was a wide range in main-channel bed material throughout this study reach. In the 
canyon area north of Kerby, bed material consisted of boulders and bedrock outcrops. In the 
ponded reaches of Souers Flat, bed material consisted of soft bottom material with .brushy 
banks. 
Floodplain vegetation consisted of pastureland grass, cultivated farm lands (often bare during 
flood season), moderate to heavy brush and tree growth, and dense, deciduous brush and tree 
growth. 
Effective velocities at Sauers Flat were estimated by assigning high "n" values to reduee the 
conveyance in the noncoritributing areas of the floodplain. This technique was also used on 
East Fork Illinois River, upstream from the Redwood Highway. Extensive areas of shallow 
flooding were judged noncontributing because of the bank configuration upstream from 
cross sections M and N. 
Initial water-surface elevations for the second segment of the East Fork Illinois River were 
determined by using the converging profile technique through five cross sections ending at 
cross section A. The effective channel at cross sections A and B was adjusted to exclude the 
embayment at the mouth of Little Elder Creek. 
Supercritical flows were encountered at a narrow canyon near cross section J. The hydraulic 
model was reset using a critical depth elevation, and the profiles continued uninterrupted 
through the remainder of the reach. 
Bed material in the commonly braided main channel consisted of large areas of unstable rock 
and gravel deposits. There are bedrock outcroppings and large, rounded boulders in the 
narrow confines of the canyons,. but, generally, the entire reach appears subject to 
considerable movement of bed material. Flood plain vegetation consisted of some areas of 
pastureland, but moderate to heavy brush and trees predominated. 
22 
Flood profiles for the first segment of the West Fork Illinois River began at its mouth and 
reflect concordant flow conditions from the main stem of the Illinois River. Backwater from 
a 1-percent-an nil a 1-chance flood would extend 4,460 feet up the West Fork Illinois River 
channel. The initial Concordant flow (or backwater) and was derived by modeling the base 
flood from Pomeroy Darri to the initial section at the mouth. 
The effective velocities at the west bank of cross section J were uncertain due to the 
configuration of the upstream channel. The cross section width was therefore arbitrarily 
reduced to exclude an eddy flow situation. 
The main-channel bed material consisted of large areas of irregular bedrock outcropping 
overlain in places by loose sand and gravel deposits. Wide gravel bars are evident where the 
low-water channel is deeply entrenched near one of the banks. Flood plain vegetation 
consisted of moderate to dense brush and tree growth. 
Initial water-surface elevations for the second segment of the West Fork Illinois River 
profiles were derived by a convergence run through a reach (five cross sections) ending at 
cross section A. Flow was tranquil throughout the reach; the only problem encountered was 
a bypass-flow situation at the Redwood Highway bridge in O'Brien. 
The low north bank of the channel upstream from the bridge allows water to flow toward the 
intersection of Lone Mountain Road and Redwood Highway, located 1,800 feet north of the 
channel. It is possible that some of the water overflows the intersection and bypasses the 
entire reach downstream from the bridge. 
For.the purpose of this study, it was assumed that the entire road overflow was limited to 850 
feet of roadway immediately north of the bridge. This limitation was based on the position 
of the upstream berm which contains all flow at the approach cross section (cross section L). 
Main channel bed material consisted of gravel bars at sharp channel curvatures, bedrock 
outcrops that formed deep low-flow pools and boulder-strewn reaches that appear unstable. 
Floodplain vegetation varied from pastureland grass to areas of dense brush and trees. 
The initial elevations for the flood profiles on Deer Creek were estimated by a convergence 
run through a reach with six cross sections ending at cross section A. 
McMullin and Thompson Creeks are tributaries that parallel Deer Greek throughout much of 
the central portion of this study reach. Although there is an exchange of peak flows near 
cross section R, it was assumed most inflow occurred at cross section P. 
Main channel bed material consisted of sizable areas of rock and gravel deposits which are 
subject to considerable movement during flood stages. Floodplain vegetation varied from 
pasture grass to dense brush and tree growth. Large acreages of cultivated farmland also 
occupy die floodplains. 
Flood profiles were drawn showing computed water-surface elevations to an accuracy of 0.5 
foot for floods of the selected recurrence intervals (Exhibit 1). 
The hydraulic analyses for this study were based on unobstructed flow conditions. The flood 
elevations, thus derived are considered valid only if there are no significant changes made to 
the existing drainage structures or to other physical features of the channels (such as changes 
23 
in a l ignment and vegetat ion) . 
3.3 Vertical Dátüni' 
All FIS reports and FIRMS"are referenced to a specific vertical datum. The vertical datum 
provides a starting point against which flood, ground, and structure elevations can be 
referenced and compared. Until recently, thestandard vertical datum used for newly created 
or revised FIS reports and FIRMs was the National Geodetic Vertical Datum of 1929 
(NGVD 29). With the completion of the North American Vertical Datum of 1988 (NAVD 
88), many FIS reports and FIRMs are now prepared using ÑÁVD 88 as the referenced 
vertical datum. 
Flood elevations shown in this FIS report and on the FIRMs are referenced to NAVD 88. 
These flood elevations must be compared to structure and ground elevations referenced to 
the same vertical datum. For information regarding conversion between the NGVD and the 
NAVD, visit the National Geodetic Survey website at www.ngs.noaa.gov, or contact the 
National Geodetic Survey at the following address: 
NGS Information Services 
N0AA,N/NGS12 
National Geodetic Survey 
" SSMC-3, #9202 
1315 East-West Highway 
Silver Spring, Maryland 20910-3282 
(301)713-3242 
(301) 713-4172 (fax) 
The conversion factor from NGVD to NAVD for all flooding sources in this report is +3.36 
feet. 
Temporary vertical monuments are often established during the preparation of a flood hazard 
analysis for the purpose of establishing local vertical control. Although these monuments are 
not shown on the FIRM, they may be found in the Technical. Support Data Notebook 
associated with the FIS report and the FIRMs for this community. Interested individuals 
may contact FEMA to access these data. 
To obtain current elevation, description and/or location information for benchmarks shown 
on the FIRMs, please contact information services Branch of the NGS at (301) 713-3242, or 
visit their website at www.ngs.noaa.gov. 
FLOODPLAIN MANAGEMENT APPLICATIONS 
TheNFIP encourages State and local governments to adopt sound floodplain management programs. 
To assist in this endeavor, each FIS report provides 1-percent annual-chance floodplain data, which 
may include a combination of the following: 10-, 2-,l-, and 0.2-percent-annual-chance flood 
elevations; delineations of the 1-percent-annual-chance and 0.2-percent-annual-chance floodplains; 
and t-percent-annuail-chance floodway. This information is presented on the FIRM and in many 
components of the FIS report, including Flood Profiles, Floodway Data tables and Summary of 
Stillwater Elevation tables. Users should reference the data presented in the FIS report as well as 
24 
additional information that may be available at the local community map repository before making 
flood elevation and/or floodplain boundary determinations. 
4.1 Floodplain Boundaries 
To provide a national standard without regional discrimination, the 1 -percent annual chance 
(100:year) flood has been adopted by FEMA as the base flood for floodplain management 
purposes. The 0.2-percent-anriual-chance (500-year) flood is employed to indicate additional 
areas of flood risk in the community. For each stream studied by detailed methods, the 1-
and 0.2-percent-annual-chance floodplain boundaries have been delineated using the flood 
elevations determined at each cross section. Between cross sections, the boundaries were 
interpolated using topographic maps at scales of 1:2,400, 1: 4,800, and 1:62,500, with 
contour intervals of 2, 4, and 80 feet, respectively (References 8, 17, and 19). 
Gilbert Creek boundaries were determined on the basis of random topographic elevations 
taken during the field surveys. They may, therefore, not show local variations of either 
higher or lower terrain between points of definition. 
For streams studied by approximate methods, the boundary of the Lpercent-annual-ehance 
flood were taken from the Flood Hazard Boundary Map (Reference 3). 
The 1- and 0.2-percent-annual-chance floodplain boundaries are shown on the Flood 
Insurance Rate Map. On this map, the 1-percent-annual-chance floodplain boundary 
corresponds to the boundary of the areas of special flood hazards (Zones A and AE), and the 
. 0.2-percent-annual-chance floodplain boundary corresponds to the boundary of areas of 
moderate flood hazards. In cases where the 1- and 0.2-percent-annual-chance floodplain 
boundaries are close together, only the 1-percent-annual-chance floodplain boundary has 
been shown: Small areas within the floodplain boundaries may lie above the flood 
elevations but cannot be shown due to limitations of the map scale and/or lack of detailed, 
topographic data. 
For the streams studied by approximate methods, only the 1-percent-annual-chance 
floodplain boundary is shown on the Flood Insurance Rate Map. 
Countvwide Update 
As part of the countywide update, floodplain boundaries were digitized from the effective 
FIRM and Floodway panels. USGS topographic maps (Reference 25) and aerial 
photography (Reference 26) were used to adjust floodplain and floodway boundaries where 
appropriate. 
The 1- and 0.2-percent-annual-chance floods were redelineated on Gilbert Creek and 
portions of the Rogue River using new topography with a one-foot contour interval provided 
by the City of Grants Pass (Reference 27). The cross section locations were digitized from 
the effective Floodway panels or work maps. Elevations used for the redellneation were 
taken from the effective floodway data tables and adjusted to theNAVD88 vertical datum. 
The redelineation along Gilbert Creek extended from SW Rogue River Avenue to just 
upstream of NW Windsor Drive, a distance of approximately 2.5 miles. Redelineation along 
the Rogue River extended from approximately river station 111,810 (cross section CD) to 
river station 158,250 (cross section DJ). 
25 
in accordance with FEMA Procedure Memorandum 36 (Reference 28), profile baselines 
have been included in all areas of detailed study. Profile baselines are shown in the location 
of the original stream centerline or original profile baseline without regard to the adjusted 
floodplain position on the new base map. This was done to maintain the relationship of 
distances between cross sections along the profile baseline between the hydraulic models, 
flood profiles and floodway data tables. 
Floodways 
Encroachment on floodplains, such as structures and fill, reduces flood-carrying capacity, 
increases flood heights and velocities, and increases flood hazards in areas beyond the 
encroachment itself. One aspect of floodplain management involves balancing the economic 
gain from floodplain development against the resulting increase in flood hazard. For 
purposes of the NFIP, a floodway is used as a tool to assist local communities in this aspect 
of floodplain management.. Under this concept, the area of the 1-percent-annual-chance 
floodplain is divided into a floodway and a floodway fringe. The floodway is the channel of 
a stream, plus any adjacent floodplain areas, that must be kept free of encroachment so that 
the 1-percent-annual-chance flood can be carried without substantial increases in flood 
heights. Minimum Federal standards limit such increases to 1 foot, provided that hazardous 
velocities are not produced. The floodways in this study are presented to local agencies as 
minimum standards that.can be adopted directly or that can be used as a basis for additional 
floodway studies. 
The floodways presented in this study were computed for certain stream segments on the 
basis of equal-eonveyance reduction from each side of the floodplain. Floodway widths 
were computed at eross sections. Between cross sections., the floodway boundaries were 
interpolated. The results of the floodway computations are tabulated for selected cross 
sections (seeTable 6). In cases where.the floodway and 1-percent-annual-chance floodplain 
boundaries are either close together or collinear, only the. floodway boundary is shown. 
For the purpose of developing the 1-percent-annual-chance floodway for the Rogue River,, 
all of the flow was assumed to be confined to the main stem channel and its immediately 
adjacent overbank. 
As agreed upon by county representatives and FEMA, the computation of floodways on the 
Rogue River, downstream of Pass Creek, on Murphy Cieek, and on Gilbert Creek were not a 
requirement of this study. 
The area between the floodway and 1 -percent-annual-chance floodplain boundaries is termed 
the floodway fringe. The floodway fringe encompasses the. portion of the floodplain that 
could be completely obstructed without increasing the water-surface elevation of the 1-
percent-annual-chance flood more than 1 foot at any point. Typical relationships between 
the floodway and the floodway fringe and their significance to floodplain development are 
shown in Figure 1. 
26 
R O O D W A Y 
FWPWE 
1 -PERCE NTVWN'JSAJL-CHANCC F W O O P L A W 
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Figure 1. Eloodway Schematic 
27 
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TÄBLE6 
INSURANCE APPLICATION 
For flood insurance rating purposes, flood insurance zone designations are assigned to the community 
based on the results of the engineering analyses. These zones are as follows: 
Zone A 
Zone A is the flood insurance rate zone that corresponds to the 1 -percent-annual-chance floodplains 
that are determined in the Flood Insurance Study by approximate methods. Because detailed 
hydraulic analyses are not performed for such areas, no base (1-percent-annual-chance) flood 
elevations (BFEs) or depths are shown within this zone. 
Zone AE 
Zone AE is the flood insurance rate zone that corresponds to the 1 -percent-annual-chance floodplains 
that are determined in the Flood Insurance Study by detailed methods. Whole-foot BFEs derived 
from the detailed hydraulic analyses are shown at selected intervals within this zone. 
Zone X 
Zone X is the flood insurance rate zone that corresponds to areas outside the 0.2-percent-annual-
chance floodplain, areas within the 0.2-percent-annual-chance floodplain, areas of 1-percent-annual-
chance flooding where average depths are less than 1 foot, areas of 1-percent-annual-chance, flooding 
where the contributing drainage area is less than 1 square mile, and areas protected from the 1-
percent-annual-chance flood by levees. No BFEs or depths are shown within this zone. 
ZoneD 
Zone D is the flood insurance rate zone that corresponds to unstudied areas where flood hazards are 
undetermined, but possible." 
Table 7 lists the flood insurance zones that each community is responsible for regulating. 
Table 7. Flood Insurance Zones Within Eaeh Community 
Community Flood Zone is) 
Cave Junction, City of AE, X 
Grants Pass, City of AE, X 
Josephine County, Unincorporated Areas A, AE, X , D 
FLOOD INSURANCE RATE MAP 
The Flood Insurance Rate Map is designed for flood insurance and floodplain management 
applications. 
;For flood insurance applications, the map designates flood insurance rate .zones as described in 
Section 5.0 and, in the 1 -percent-annual-chance floodplains that were studied by detailed methods, 
shows selected whole-foot BFEs or average depths. Insurance agents use the zones and BFEs in 
conjunction with information on structures and their contents to assign premium rates for flo.od 
insurance policies. 
-47 
For floodplain management applications, the map shows by tints, screensv and symbols, the 1 - and 
0.2-percent-annual-chance fl'oodplains floodplains, floodways, and the locations of selected cross 
sections used in the hydraulic analyses and floodway computations. 
The county wide Flood Insurance Rate Map presents flooding information for the entire geographic 
area of Josephine County. Previously, Flood Insurance Rate Maps were prepared for each 
incorporated community and the unincorporated areas of the County identified as flood-prone. This 
countywide Flood Insurance Rate Map also includes flood-hazard information that was presented 
separately on Flood Boundary and Floodway Maps, where applicable. Historical data relating to the 
maps prepared for each community are presented in Table 8, "Community Map History." 
OTHER STUDIES 
In December 1965, the U.S Army Corps of Engineers published a Flood Plain Information report 
which described the flooding in Josephine County during the 1964 flood (Reference 29). Flood 
boundaries for the 1964 flood, and estimated boundaries for the 1861 flood were shown on aerial 
photographs. No profiles were presented. 
In July 1966, the U.S. Army Corps of Engineers published a statewide Post Flood Report describing 
the floods that had occurred in December 1964 and January 1965 (Reference 10). A discussion of 
flooding from streams within Josephine County included graphic displays of cumulative precipitation 
and storm hydrographs. 
In November 1970, USGS published a profile study for the Rogue River in a reach extending from 
the Grants Pass gaging station to the Lost Creek for the 1964 flood and for the 10- and 20-year 
floods, based on hydrology considered to be effective at that time. Also presented were cross 
sections and channel plan views. Profile concurrence for the design floods was not attempted 
because of significant changes in the hydrologic analyses due to revised flood-control estimates. 
Also present were cross sections and channel plan views. Profile concurrence for the design floods 
was not attempted because of significant changes in the hydrologic analyses due to revised flood-
control estimates. 
In July 1971, the U.S. Geological Survey prepared a Flood Insurance Study for Josephine County 
(Reference 30). The report presented base flood elevations and estimated flood boundaries which 
were shown on enlarged portions of 10-minute quadrangles having 80-foot contour intervals. Flood 
profiles for the 500-, 100-, and 10-year floods were based on the same hydrology used in the 
previously described Profile Study (Reference 31). The Type-10 study did not include the 
incorporated area of Grants Pass. 
In July 1975, the U.S. Army Corps of Engineers published a statewide Post Flood Report describing 
floods that had occurred in January 1974 (Reference 12). A discussion of flood magnitudes and 
storm damage was similar to their report issued after the 1964 floods in Oregon. 
A Flood Insurance Studies have been published for the unincorporated areas of Jackson County 
(Reference 1 and 32). The hydrologic analysis used in the Grants Pass study is consistent with the 
analysis used in the Jackson County study. 
48 
O \ RO 0 \ 
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Flood Studies were prepared for the incorporated area of Cave Junction (Reference 33), and for the 
incorporated area of Grants Pass (Reference 34). All data presented in these studies agree exactly 
with data presented herein. 
.., Irf November T974, a Flood Hazard Boundary Map was published for Cave Junction (Reference 35). 
This Flood Insurance Study is more detailed and, thus, supersedes that map. 
This report either supersedes or is compatible with all previous studies published on streams studied 
in this report and should be considered authoritative for the purposes of theNFlP. 
8.0 LOCATION OF DATA 
Information concerning the pertinent data used in the preparation of this study can be obtained by 
contacting FEMA, Mitigation Division, Federal Regional Center, 130 228th Street, SW, Bothell, 
Washington 98021-9796. 
9.0 BIBLIOGRAPHY AND REFERENCES 
1. Federal Emergency Management Agency, Flood Insurance Study, Jackson County, Oregon 
(Unincorporated Areas), January 5, 1979 •• 
2. Northwest River Basin Commission, Columbia Basin Inter-Agency Committee, River Mile 
Index. Rogue River and Tributaries in Oregon. Vancouver, Washington, 1967 
3. U.S. Department of Housing and Urban Development, Federal Insurance Administration, Flood 
Hazard Boundary Map. Josephine County. Oregon (Unincorporated Areas). Scale 1:24,000,1977 
4. State of Oregon, Oregon Blue Book. Salem, Oregon, 1977-1978 
. 5. U. S. D epartment of Commerce, B ureau of the Census websi te, 
http://www.census.gov/mainywww/cen2000.html 
6. Oregon State Water Resources Board, Rogue River Basin. Salem, Oregon, January 1959 
7. U.S. Department of the Interior, Geological Survey, Water-Supply Paper 1649, Water for 
Oregon. 1965 
8. U.S. Department of the Interior, Geological Survey, 15-Minutes Series Topographic Maps. Scale 
1:62,500, Contour Interval-80 feet: Grants Pass, Oregon (1954) 
9. Ü.S. Department of Commerce, National Oceanic and Atmospheric Administration, National 
Climatic Center, Climatographv of the United States No. 81 (Oregon). Monthly Normals of. 
Temperature. Precipitation, and Heating and Cooling Degree Days. 1941-1970 
10. U.S. Department of the Army, Corps of Engineers, Portland District, Post Flood Report. 
Portland, Oregon, July 1966 
50 
-11. U.S. Department of the Army, Corps df Engineers-, Portland District, Cumulative Frequency 
Curve - Maximum Annual Discharge, Rogue River at Grants Pass. Portland. Oregon, 1976 and 
1978 
12. U.S. Department of the Army, Corps of Engineers, Portland District, Post Flood Report. 
Portland, Oregon, 1975 
13. U.S. Department of the Army, Corps of Engineers, Portland District, Cumulative Frequency 
Curve--Maximum Annual Discharge, Rogue River at Grants Pass. Portland, Oregon, 1976 and 
1978 
14. U.S. Department of the Interior, Geological Survey, Log-Pearson Type III Flood-Frequency 
Analysis Using Guidelines of Water Resources Council (Program. J-407). Chapter 1, Section C, 
vol. 4, P.Ii. Corrigan and W. Kirby, 1976 
15. U.S. Water Resources Council, "Guidelines for Determining Flood Flow Frequency," Bulletin 
17, 1976 
16. U.S. Department of the Interior, Geological Survey, Open-File Report 79-553, Magnitude and 
Frequency of Floods in Western Oregon. D.D. Harris, L.L. Hubbard, and L.E. Hubbard, 1979 
17. City of Grants Pass, Contour and Drainage Maps, Scale 1:2,400, Contour Interval 2 feet: Grants 
Pass, Oregon (1957) 
18. U.S.. Department of the Interior, Geological Survey, Water Resources Division, Open-File Report 
76-499, Computer Applications for Step-Backwater and Floodwav Analysis, Program E-431, 
J. O. Shearman, 1976 
19. U.S. Department of the Interior, Geological Survey, Oregon District, Contour Map of Selected 
Reaches of Streams in Josephine County. Oregon, Scale 1:4800, Contour Interval 4 feet: 
Josephine County, Oregon, 1979 
20. U.S. Department of the Interior, Geological Survey, Water-Supply Paper 1869-A, Definition of 
Stage-Discharge Relations in Natural Channels by Step-Backwater Analysis. J.F. Bailey and 
H.A. Ray, 1966 
21. U.S. Army Corps of Engineers, Generalized Computer Program HEC.-2 Water-Surface Profiles, 
September 1988, Error Correction 03, Hydrologie Engineering Center, Davis, California 
22. U.S. Department of the Interior, Geological Survey, "Preparation of Input Data for Automatie 
.Computation of Stage-Discharge Relations at Culverts," Techniques of Water-Resources 
Investigations. Book 7, Chapter C-3, H.F. Matthai, H,E. Stull, and Jacob Davidian, 1968 
23. U.S. Department of the Interior, Geological Survey, Water Resources Division, "Measurement of 
Peak Discharge at dams by Indirect Methods," Techniques of Water-Resources Investigations. 
Book 3, Chapter A-5, Harry Husling, 1967 
24. H.W. and E.F. Brater, Handbook of Hydraulics, 4lK Edition, New York: McGraw-Hill Book 
Company, 1954 
51 
25. U.S. Department: of the Interior, Geological Survey, 7.5-Minute'Series Topographic Maps: 
Map Name Date Scale Contour Interval 
Applegate 1983 \ 24,000 40 ft 
Buckskin Peak 1989 1 24,000 40 ft 
Bunker Creek 1989 1 24,000 40 ft 
Cave Junction 1989 1 24,000 40 ft 
Eight Dollar Mountain 1989 1 24,000 40 ft 
Gal ice 1989 1 24,000 40 ft 
Glendale 1986 1 24,000 40 ft 
Go Idea 1986 1 24,000 40 "ft 
Grants Pass 1986 1 24,000 40 ft 
Holland 1989 1 24,000 40 ft 
ICelsey Peak 1989 1 24,000 40 ft 
Kerby Peak 1986 1 24,000 40 ft 
King Mountain 1983 1 24,000 40 ft 
Merlin 1986 1 24,000 40 ft 
Mount Reuben 1989 1 24,000 40 ft 
Murphy 1986 1 24,000 40 ft 
Murphy Mountain 1986 1 24,000 40 ft 
O'Brien 1989 1 24,000 40 ft 
Onion Mountain - 1989 1 24;0QQ 40 ft 
Rogue River 1983 1 24,000 40 ft 
Selma 1989 '1 24,000 40 ft 
Sexton Mountain 1986 1 24,000 40 ft 
Takihna 1989 1 24,000 40 ft 
Wilderville 1986 1 24,000 20 ft 
26. Josephine County, Aerial Photography, 2005 
27: City of Grants Pass, OR, Topographic Mapping, Contour Interval I-foot, 2004 
28. Federal Emergency Management Agency, Procedural Memorandum No. 36 - Profile Baselines 
on Digital Flood Insurance Rate Mans (DFIRMs) with Orthophoto Bases. Washington, D.C., 
July 7, 2005 
29. U.S. Department of the Army, Corps of Engineers, Portland District, Flood Plain Information -
Interim Report. Portland, Oregon, 1965 
30. U.S. Department of the Interior, Geological Survey, Water Resources Division, Flood Insurance 
Study. Josephine County, Oregon (Unincorporated Areas). Preliminary Draft Report, 
unpublished 
31. U.S. Department of the Interior, Geologieal Survey, Water Resources Division, Open-File 
Report, Water-Surface Elevations and Channel Characteristics for Selected Reaches of the Rogue 
River and Elk Creek'. Jackson and Josephine Counties. Portland, Oregon, 1970 
32. Federal Emergency Management Agency, Flood Insurance Study. Jackson County. Oregon. 
(Unincorporated Areas). September 27, 1991 
33. Federal Emergency Management Agency, Flood Insurance Study. City of Cave Junction. 
Oregon, unpublished, September 27, 1991 
52 
34. Federal Emergency Management Agency, Flood Insurance Study, City of Grants'Pajs; Oregon, 
November 1980. 
35. U.S. Department of Housing and Urban Development, Federal Insurance'Administration, Flood 
Hazard Boundary Map, City of Cave Junction, Oregon. Scale 1:12,000, 1974 
10.0 REVISION DESCRIPTIONS 
This section has been added to provide information regarding significant revisions made since the 
original Flood Insurance Study was printed. Future revisions may be made that do not result in the 
republishing of the Flood Insurance Study report. To assure that any user is aware of all revisions, it 
is advisable to contact the community repository for your community. 
All previous study revision descriptions have been incorporated into the appropriate sections of this 
FIS. Table 9 summarizes the flooding sources updated since the original study was completed. 
Table 9. Revised Study Descriptions 
Flooding Source Community 
Rogue River 
Rogue River 
LouseCreek 
Applegate River 
Waters Creek 
Gilbert Creek 
Josephine County 
Unincorporated 
Areas and the City 
of Grants Pass 
Josephine County 
Unincorporated 
Areas and the City 
of Grants Pass 
Josephine County 
Unincorporated 
Areas 
Josephine County 
Unincorporated 
Areas 
Josephine County 
Unincorporated 
Areas 
City of Grants 
Pass 
Limits of Study 
From approximately 
3.5 miles downstream 
to 2.2 miles upstream 
of the South ó"1 Street 
bridge 
From approximately 
5.2 miles downstream 
to 3,5 miles upstream 
of the South 6th Street 
bridge 
From approximately 
470 feet downstream 
of Monument Drive to 
Granite Hill Road 
From the upstream end 
of the initial analysis 
to the Josephine-
Jackson County line 
From its confluence 
with Slate Creek 
upstream 
approximately 1 mile 
From SW Rogue River 
Avenue to just 
upstream of NW 
Windsor Drive 
Revision Date 
September 19, 
1990 
November 
2008 
September 19, 
1990 
September 19, 
1990 . 
September 19, 
.1990 
November 
2008 
Panel 
Numberfs) 
0484, 0492, 
0503,0511, 
0512, and 
0516 
0491,0492, 
0503,0511, 
051.2, 0516, 
0517 
0314, 0501, 
and 0502 
0708,0710, 
0720,0740, 
and 0750 
0656 
0504 
53 
Countywide Update ("December 3, 2009) 
The countywide update was completed in November 2008 by WEST Consultants, Inc. for FEMA 
under Contract No. EMS-2OO1-CO-O068. 
This update combined the Flood Insurance Rate Maps and Flood Insurance Study reports for 
Josephine County and incorporated communities into the countywide format. Under the countywide 
format, FIRM panels have been produced using a single layout format for the entire area within the 
county instead of separate layout formats for each community. The single-layout format facilitates 
the matching of adjacent panels and depicts the flood-hazard area within the entire panel border, even 
in areas beyond a community's corporate boundary line. In addition, under the countywide format 
this single FIS report provides all associated information and data for the entire county area. 
As part of this revision, the format of the map panels has changed. Previously, flood-hazard 
information was.shown on both FIRMs and Flood Boundary and Floodway Maps (FBFMs). In the 
new format, all base flood elevations, cross sections, zone designations, and floodplain and floodway 
boundary delineations are shown on the FIRM; the FBFM has been eliminated. Some of the flood 
insurance zone designations were ehanged to reflect the new format. Areas previously shown as 
numbered Zone A were changed to Zone AE. Areas previously shown as Zone B were changed to 
Zone X (shaded). Areas previously shown as Zone C were changed to Zone X (unshaded). In 
addition, all Flood Insurance Zone Data Tables were removed from the FIS report and all zone 
designations and reach determinations were removed from the profile.panels. 
All flood elevations shown in this FIS reportand on the FIRM panels were converted from NGVD 29 
to NAVD 88. The conversion factor from NGVD to NAVD for all streams in this report is +3.36 
feet. 
The 1- and 0.2-percent-annual-chance floods were redelineated on Gilbert Creek and portions of the 
Rogue River using new topography with a one-foot contour interval provided by the City of Grants 
Pass (Reference26). The cross section locations were digitized from the effective Floodway panels 
or work maps. Elevations used for the redeiineation were taken from the effective floodway data 
tables and adjusted to the NAVD 8 8 vertical datum. The redeiineation along Gilbert Creek extended 
from S W Rogue River Avenue to just upstream of N W Windsor Drive, a distance of approximately 
2.5 miles. Redeiineation along the Rogue River extended from approximately river station 111,810 
(cross section CD) to river station 158,250 (cross section DJ). 
The floodplain boundaries for all other flooding sources.were digitized from the effective FIRM and 
Floodway panels. Aerial photography (Reference 25) and USGS 7.5* Quadrangles (Reference 24) 
Were used to adjust floodplain and floodway boundaries where appropriate. 
54 
c 
N : O M P L E T E R E P O R T L O C A T E D I N <T 
/ PLANNING F I L E 
FLOOD 
INSURANCE 
STUDY 
JOSEPHINE COUNTY, OREGON 
AND INCORPORATED AREAS 
VOLUME 2 OF 2 
COMMUNITY COMMUNITY 
NAME1 NUMBER 
CAVE JUNCTION, CITY OF 410107 
GRANTS PASS, CITY OF 410108 
JOSEPHINE COUNTY UNINCORPORATED AREAS 415590 
E f fec t i ve : 
December 3, 2009 
Federal Emergency Management Agency 
F l o o d I n s u r a n c e S t u d y N u m b e r 
4 Ì 0 3 3 C V 0 0 2 A 
^ C O M P L E T E R E P O R T L O C A T E D IN P L A N N I N G F I L i * 








/rticle 13: Special Purpose Districts ' 13-1 
13.010 Purpose 13-1 
13.020 General Provisions 13-1 
13.025 Special Purpose District Overlay Map 13-1 
13.100 Slope Hazard District 13-1 
13.110 Purpose 13-1 
13.111 Definition 13-2 
13.120 Procedures for Development of Partitions, 
Subdivisions and Planned Unit Developments 13-2 
13.121 Procedure,...;.... 13-2 
13.122 Complete Submittal ..13-2 
13.123 Criteria for Approval .. 13-2 
13.130 Submittal Requirements for Plans and Reports 13-3 
13.131 Steep Slope Development Report 13-3 
13.132 Grading Plan . ..... . . . . 13-3 
13.133 . Erosion Control Plan . . .. 13-5 
13.140 Criteria for Approval of Plans and Reports 13-5 
13.141 Steep Slope Development Reports . - 13-5 
13.142 Grading Plan . . . 13/-6 
13 .14.3 Erosion Control Plan . . . 13-7 
13.150 : Criteria, for Approyal qf the Final Plat. ...... 13-7 
: 13.160 Prpcedures for Approval of Grading or Construction 
on. an Existing Lot .. . ... ... . " ... . 13-8 
13.170 : Appeals . . .. . . . . 13-9 
13.200 - Flood Hazard District-, .v. . . .... . . . . .13-10 
13.2i0 Authorization, Findings of Fact,. Purpose, 
and Objectives 13-
13.211 Authorization ! . . , . . . . . . 13-
13.212 Findings of Fact ... 13-
13. 213 .Purpose ......; \ ....... ^  ..... . . . . . . ; ; 13-
13. 214 Methods of Reducing. Flood Losses . 13-
13.220 Definitions : , . 13-
13.221 Interpretation of Terms 13-
13.222 - Definitions » . .V, ... ... .13-
13.230 . General Provisions...., 13-' 
13.231 Lands to Which This Article -Applies. ..13-
13.232 Basis for Establishing the Areas o.f 
Special Flood Hazard -
13. 233 Compliance •: 13-
13.234 Abrogation and Greater Restrictions 13-
13.235 Interpretation 13-
13.236 Warning and Disclaimer of Liability 13-
13.24 0 Administration 13-
13.241 Development Permit Required 13-
13.242 Application and Submittal Requirements ...... 13-
13.243 Elevation Certification 13-
13.244 Designation of Local Administrator 13-
13.245 Duties and Responsibilities of Director 13-
13.24 6 Variances 13-
13.247 Appeals 13-, 
13.250 Provisions for Flood Hazard Reduction • 13-
13.251 General Standards 13-
13.252 Anchoring - . 13-
13.253 AH Zone Drainage .- 13-
13.254. Construction Materials and Methods 13-
13-255 Utilities and Service.,. ........ 13-
13.256 Review Where Elevation Data- Not. Available . . . 13-
13,260 . Specific Standards ..... "... 13-
13.2 61 Residential Construction 13-
13.262 Non-Residential Construction. , _ 13-
13.263 Manufactured Homes . 13-
.13 .2 64 Recreational Vehicles 13-
13.265 Crawlspaces and Below-Grade Crawlspaces 13-
13.2 70 - Floodways .- , 13-
13.271 Designated Floodways 13-
13.272 Floodways Not Designated .". 13-
13.280 Standards for Shallow Flooding Areas (AO Zones) . . 13-
13.290 . Critical Facilities and Essential Facilities ..... 13-
13.291 • Critical Facilities . ..,,..... ... 13-
13.292 Essential Facilities ......... r 13-
13 .300 ..Medical Overlay District ... . , \ ..... 13-22 
13.310 , Purpose 13-22 
13.320 Permitted Uses ................. 13-22 
13. 331 -Review Procedure Schedule . . ... 13-23 
13. 332: . ^Criteria for Approval . , — 13-23 
13.400 ' Historic Districts : . . i . . . 1.3-24. 
13. 411 . purpose ' .... 13-24 
13.412 Definitions . . 13-24 
13.420 District Types' and Map 13-26 
.13,421 Historic Types. , . . ...'..'.........: 13-26 
13. 422 Historic Map . . . , . . . . ... . 13-26 
-'•". 13.423 Landmarks 13-26 
13. 430 Procedures for Historic Review 13-28 
13.431 Initiation 13-28 
13.432 Preapplication Conference Required 13-28 
13.433 Complete Submittal 13-28 
13.434 Designation and Review Procedures 13-28 
13.435 Amendment and Recision Procedures 13-29 
13.436 Appeals 13-29 
13.440 Designation of Historic Districts 13-29 
13.441 Designation Criteria 13-29 
13.442 Historical Buildings and Sites' Commission and 
City Council Action • 13-29 
13.450 Development Review .13-30 
13.451 Review Required 13-30 
•13.452 Criteria for Approval 13-30 
13.4 53 Historical Buildings and Sites Commission 
Action . . . . . 13-30 
13.454 Public Safety Caveat 13-30 
13.460 Demolition Review 13-31 
13.461 Review Required 13-31 
.13.462 Criteria, for Approval ....13-31 
13.463 Historical Buildings and Sites Commission 
Action • 13-32 
13 .4 64 Public Safety Caveat . . . . 13-34 
Article 13: Special Purpose Districts 
13.010 Purpose 
The special purpose districts are intended to accommodate 
development within areas with specific natural, 
historical, or locational features. The standards herein 
are intended to mitigate natural hazards, to protect 
natural or historical features, and/or to mitigate land 
use conflicts. The special district standards apply in 
addition to the standards of the underlying zoning 
district. 
213,.020 , General Provisions 
The Special Purpose Districts shall encompass land areas, 
that: 
(1) have slopes exceeding 15%. 
(2) . are located within the boundaries of the 100 year flood 
plain. 
(3) are loca^d in proximity to hospital and that are 
appropriate for medical uses. 
(4) are recognized as historically significant. 
313.025 Special Purpose District Overlay Map. There shall be an 
overlay map to the Zoning Map that depicts boundaries of 
the special districts shown herein. These maps are 
incorporated into this Section by reference. The special 
purpose district maps may be amended as provided in 
Article 4 of this Code. The maps are general in nature. 
The. applicant for a development shall verify the grades 
on lands or portions of lands that are the subject" of any 
specific application. 
13.200 Flood Hazard District 
13.2-10 Authorization, Findings of Fact, Purpose, and Objectives 
13.211 Authorization. 
The State of Oregon has, in the home rule provisions of. 
the Oregon Constitution, Article XI Section 2, and in ORS 
221.410, delegated the responsibility to local 
governmental units to adopt regulations designed to 
promote the public health, safety, and general welfare of 
its citizenry. 
13.212 Findings of Fact. 
(1.) : The flood hazard areas of the City are subject to 
periodic inundation which results: in loss of life and 
property, health and safety hazards, disruption of 
commerce and governmental services, extraordinary public 
expenditures for flood protection and relief, and 
impairment of the tax base, all of which adversely affect 
the public health, safety and general welfare. 
(2) These flood losses are caused by the cumulative effect of 
obstructions in areas of special flood hazards which 
increase flood heights and velocities, and when 
inadequately anchored, damage uses In other areas. Uses 
that are inadequately flood-proofed, elevated ot 
otherwise protected from flood damage also contribute to 
the flood loss. 
13.213 Purpose. It is the purpose of the Flood Hazard District 
to promote the public health, safety, and general 
welfare, and to minimize public and private losses due to 
flood conditions in specific areas by provisions 
designed: - - -
(1) To protect human life and health; " •'" • 
(2) To minimize expenditure of public money and costly flood-
control projects; 
(3) To minimize, the need for rescue and relief ..efforts 
associated with flooding and generally undertaken at the 
expense of the general public;. 
(4) To minimize prolonged business interruptions; 
(5) To minimize damage to public facilities and utilities 
such as water and gas mains, electric, telephone- and' 
sewer lines, streets, and bridges located in areas of 
special flood hazard; 
(6) To help maintain a stable tax base by providing for the 
sound use and development of areas of special flood 
hazard so as to minimize future flood blight areas; 
(7) To ensure that potential buyers are notified that 
property is in an area of special flood hazard; and 
(8} To ensure that those who occupy the areas of special 
flood hazard assume responsibility for their actions. 
13.214 Methods of Reducing Flood Losses. 
In order to accomplish its purposes, this Article 
includes methods and provisions for: 
(1) Restricting or prohibiting uses which are dangerous to 
health, safety, and property due to water or erosion 
hazards, or which result in damaging increases in erosion 
or in flood heights or velpcities; 
(2) Requiring that uses vulnerable to floods, including 
facilities which serve such uses, be protected against 
flood damage at the,time of initial construction; 
(3) Controlling the alteration of natural floodplains, stream 
channels, and natural protective barriers, which help 
accommodate or channel floodwaters;. 
(4) Controlling filling, grading, dredging, and other 
development which may increase flood damage; 
(5) Preventing or regulating the construction, of flood 
barriers which, will unnaturally.divert floodwaters or 
which may increase flood hazards in other areas; and 
(6) Coordinating and supplementing the provisions. of the 
state building cod with local land; use ^ and development 
ordinances. 
13".220 Definitions 
13.221 . . .Interpretation of - Terms. Unless specifically defined 
.-.beiow, words or phrases used in this, article shall be 
interpreted so as to give them t-he meaning they have in 
.common usage and to give this article its most reasonable 
.. application:... In the event of a conflict between the 
definitions in this Article and Article 30 of this Code, 
the (definitions in this Article shall apply to the 
•provisions of this Article. 
12.222 Definitions 
(1) Appeal. "Appeal" means a request for a review of any 
provision of this Article or a request for a variance. 
(2) Area of Shallow Flooding. "Area of shallow flooding" 
means a designated AO or AH zone on the Flood Insurance 
Rate Map (FIRM). The base flood depths range from one to 
three feet; a clearly defined channel does not exist; the 
path of flooding is unpredictable and indeterminate; and 
velocity flow may be evident. AO is characterized as 
sheet flow and AH indicates ponding. 
(3) Area of Special Flood Hazard. "Area of special flood 
hazard" or "special flood hazard area" (SFHA) means the 
land in the floodplain within a community subject to a 
one percent or greater chance of flooding in a given 
year-. Designation on maps always includes the letters A 
or V. 
{4) Base Flood. "Base flood" means the flood having a one 
percent chance of being equaled or exceeded in any given 
year; Also referred to as the u100-year flood." 
Designation on maps always includes the letters A or V. 
(5) Basement^ "Basement" means any area of the building 
having its floor subgrade (below ground level) on all 
sides. 
(6) Below-Grade Crawl Space. "Below-grade crawl space" means 
an enclosed area below the base flood elevation in which 
the interior grade of the crawlspace is lower than the 
adjacent1exterior grade. (An at-grade crawl-space is one 
in. which they interior grade is at ox above the elevation 
of the exterior grade). For below-grade crawlspaces, 
.these, regulations specify that the interior grade is not 
more than two feet below the lowest adjacent exterior , 
grade, and the height, measured from the interior grade 
of the crawlspace to the top of the crawlspace 
foundation, does not exceed 4 feet at any point. 
(7) Critical Facility. "Critical facility" means a facility 
for which even a slight chance of flooding might be too 
- .great- Critical facilities include, but are not limited 
-to schools, nursing homes) hospitals, police, fire, and 
- •'. ' emergency response installations, installations which 
. produce, use or store hazardous materials or hazardous 
waste. 
(8) Development. "Development" means any manrnade change to 
improved or unimproved real estate, including but not 
limited to buildings or other structures, mining,. 
dredging, filling, grading, paving, .xcavation or 
drilling operations located within the area of special 
flood hazard. 
(9) Elevated Building. "Elevated building" means for 
insurance purposes, a non-basement building which has its 
lowest elevated floor raised above ground level by 
foundations walls, shear walls, post, piers, pilings, or 
columns. 
(10) Essential Facility. "Essential facility" has the meaning 
as defined in the State Building Code. 
(11) Existing Manufactured Home Park or Manufactured Home 
Subdivision. "Existing manufactured home park or 
manufactured home subdivision" means a manufactured home 
park or manufactured home subdivision for which the 
construction of facilities for servicing the lots (in a 
subdivision) or spaces (in a park) on which the 
manufactured homes are to be affixed (including, at a 
minimum, the installation of utilities, the construction 
of streets, and either final site grading or the pouring 
of concrete pads) is completed before the effective date 
of the adopted floodplain management regulations. 
(12) Expansion to an Existing Manufactured Home Park or 
Manufactured Home Subdivision. "Expansion to an existing 
manufactured home park or manufactured home subdivision" 
means the preparation of additional sites by the 
construction of facilities for servicing the lots or 
spaces on which the manufactured homes are to be affixed 
(including the installation -of utilities., the • 
construction of streets, and either final site grading or 
the pouring of concrete pads). . 
(13) Flood or Flooding. "Flood", or "flooding" means a general 
and temporary condition of partial or complete inundation 
of normally dry land areas from: 
(a) The overflow of inland or tidal waters; and/or : 
(b) The unusual and rapid accumulation of runoff of 
surface waters from any source. 
(14.) Flood Insurance Rate Map (FIRM) . "Flood Insurance Rate 
Map (FIRM)" means the official map on which the Federal 
Insurance Administration has delineated both the areas of 
special flood hazards and the risk premium zones-
applicable to the community. 
(15) Flood Insurance Study. "Flood Insurance Study" means, the 
official report provided"by the Federal Insurance 
Administration that includes flood profiles, the Flood 
Boundary-Floodway Map, and the water surtace elevation of 
the base flood. 
(16) Floodway. "Floodway" means the channel of a river or 
other watercourse and the adjacent land areas that must 
be reserved in order to discharge the base flood without 
cumulatively increasing the water surface elevation more 
• than one foot. 
(17) Lowest, Floor. ''Lowest floor" means the lowest floor of 
the lowest enclosed areas (including basement). An 
unfinished or flood-resistant enclosure, usable solely 
for parking of vehicles, building access or storage, in 
an area other than a basement area, is not considered the 
building's lowest floor, provided that such enclosure is 
not built so as to render the structure in violation of 
the applicable non-elévation design requirements of this 
ordinance (provisions for fully enclosed areas below the 
lowest floor in Section 13.261(2) and for crawlspaces in 
Section 13.265). 
(18) Manufactured Home. "Manufactured home" means a 
structure, transportable in one or more sections, which 
is biiilt on a permanent chassis and is designed for use 
with or without a permanent foundation when attached to 
the required utilities. The term ^manufactured home" 
does not include a ^recreational vehicle." 
(19) Manufactured Home Park or Manufactured^Home Subdivision. 
"Manufactured Home Párk or Manufactured Home Subdivision" 
means a parcel (or contiguous parcels) of land divided 
into two or more manufactured home lots or spaces for 
rent or sale. 
(20) New Construction. "New construction"- means structures 
- for which the "start of:Construction" commenced on or 
after the effective date of adopted floodplain management 
regulations. 
(21) New Manufactured Home Park or Manufactured Home 
Subdivision. "New manufactured home park or manufactured 
home subdivision" means a manufactured home park or 
subdivision for which the construction of facilities for 
servicing the lots or. spaces on which the manufactured 
homes are to be affixed (including at a minimum, th$ 
installation of utilities, the construction of streets, 
and either final site grading -or the pouring of concrete 
pads') is completed on or after the effective date of 
adopted floodplain management regulations. 
(22) Recreational Vehicle. vvRecreational vehicle" means a 
vehicle which is: 
(a) Built on a single chassis; 
(b) 400 square feet or less when measured at the largest 
hori zontal proj ection; 
(c) Designed to be self-propelled or permanently towable 
by a light duty truck; and 
(d) Designed primarily not for use as a permanent 
dwelling but as temporary living quarters for 
recreational, camping, travel, or seasonal use. 
(23) Start of Construction. "Start of construction" includes 
substantial improvement and means the date the building 
permit was issued, provided the actual start of 
construction, repair, reconstruction, placement, or other 
improvement was within 180 days of the permit date.. 
The actual start means either the first placement of 
permanent construction of a structure on a sit, such as. 
the pouring of slab or footings, the installation of 
piles, the construction of columns, or any work beyond 
the stage of excavation; or the placement of a 
manufactured home on a foundation. 
Permanent construction does not include land preparation, 
such as, clearing grading and filling; nor does it include 
the installation of streets and/or walkways; nor does it 
include excavation for a basement, footings, piers, or 
foundations or the erection of temporary forms,; nor does 
it include the installation on the property of accessory 
buildings, such as garages or sheds not occupied as 
dwelling, units or not part of the main structure. 
For a substantial improvement, the actual start of 
construction means the first alteration of any wall, 
ceiling, floor, or other structural part of a building, 
whether or not that alteration affects the external 
.. dimensions of the building: 
(24) State Building Code. "State Building Code" means the 
combined specialty codes. 
(25) Structure. "Structure" means a walled and roofed 
building including a gas or liquid storage tank that is 
. principally above ground. 
(26) Substantial Damage.- "Substantia.1 damage" means. damage of 
* any origin sustained by a structure.whereby the cost of . 
restoring the structure to its before damaged condition 
would equal or exceed 50 percent of the market value of 
the structure before the damage occurred. 
(27) Substantial improvement. "Substantial improvement" means 
any repair, reconstruction, or improvement.of a 
structure, the cost of which equals or exceeds 50 percent 
of the market value of the structure either: 
(a) Before the improvement or repair is started; or 
(b) If the structure has been-damaged and is being 
restored, before the damage occurred. 
For the purposes of this definition, "substantial 
improvement" is considered to occur when the first 
alteration of any wall, ceiling, floor, or other 
structural part of the building commences, whether 
or not that alteration affects the external 
dimensions' of the structure. 
The term does not, however, include either: 
(a) . Any project for improvement of a structure to 
correct existing violations of .state or. local 
health, sanitary, or safety code specifications 
which have been identified by the local code 
enforcement official and which are the minimum 
necessary to assure safe living conditions; or 
(b.) Any alteration of a structure listed on the National 
Register of Historic Places or a State Inventory of 
Historic Places. 
(.28) Variance. "Variance" means a grant of relief fr-om the 
requirements of this Article which permits construction 
in a manner that would otherwise be prohibited by this 
Article. 
(29) Water Dependent, "Water dependent" means a structure for 
commerce or industry which cannot exist in any other 
•location and is dependent on the water by reason of the 
intrinsic nature of its operations. 
13/230 General Provisions 
13.231 Lands- to Which This Article Applies.. The provisions of 
this article shall apply to all areas of-special, flood 
hazards, within the jurisdiction of the City of Grants 
Pass, including any areas managed-under Intergovernmental 
Agreement in accordance with the authority: provided in 
Oregon Revised Statute Chapter 190.. 
-13.232 Basis for Establishing the Areas of Special Flood Hazard. 
The areas of special flood hazard identified by the Flood 
Insurance Administration in a scientific and engineering 
report etlcitled MFlood Insurance Stu^y, Josephine County 
and Incorporated Areas," dated December 3, 2009, with 
accompanying Flood Insurance Maps, and any revision, are 
hereby adopted by reference and declared to be part of 
this Code. The best available information for flood 
hazard area identification as outlined in Section 
13.245(2) shall be the basis for regulation until a new 
FIRM is issued which incorporates the data utilized under 
Section 13.245(2). 
The areas of special flood hazard shall be depicted on 
the Special Purpose District overlay .maps of this Code. 
The Flood Insurance Study and Flood Maps are on file at 
the Department of Community Development, and are 
available for public review. 
13.233 Compliance. No structure or land shall hereafter be 
constructed, located, extended, converted or altered 
without full compliance with the terms of this Article 
and other applicable regulations, including all 
applicable requirements of the State Building Code, and 
:all FEMA requirements, including requirements of the 
FE.MA/FIA Technical Bulletins, 
Failure to comply with any of the requirements of this 
Article, including violations of conditions and 
safeguards established in connection with thè conditions, 
shall constitute a violation. Penalties for violations 
and noncompliance, and remedies, to correct violations and 
noncompliance, are governed by the provisions of Article 
1 of this' Code and any and all other provisions of this 
Code, the Municipal Code, and laws of the City of Grants 
Pass. 
Abrogation and Greater Restrictions. This Article is not 
intended to repeal, abrogate, or impair any existing 
easements, covenants, or deed restrictions. However, 
where this Article and another ordinance, state building 
code, easement, covenant, or deed restriction conflict or 
overlap, ' whichever imposes the. more stringent 
restrictions shall prevail. 
13.235 Interpretation. In the interpretation and application of 
this Article, all provisions shall be: 
(1) Considered as minimum requirements; 
(2) Liberally construed in favor of the governing body; and 
(3) Deemed to neither limit nor repeal any other powers 
. granted under state statutes and rules including the. 
:state building code. . . 
13.234 
13.236 Warning and Disclaimer of Liability. The degree of flood 
protection required by this article is considered 
reasonable for regulatory purposes and is based on 
scientific and engineering considerations. Larger floods 
can and will occur on rare occasions. Flood heights may 
be increased by man-made or natural causes. This article 
does not imply that land outside the areas of special 
flood hazards or uses permitted within such areas will be 
free from flooding or flood damages. This article shall 
not create liability on the part of the City of Grants 
Pass, any officer or employee thereof, or the Federal 
Insurance Administration, for any flood damages that 
result from reliance on this ordinance or any 
administrative decision lawfully made hereunder, 
13.240 Administration. 
13/241 Development Permit Reguired. A Development Permit shall 
be obtained before construction' or development begins 
within any area of special flood hazard established in 
Section 13.232. The permit shall be for all structures 
including manufactured homes, as set forth in the 
Definitions section of this Article, and for all 
development including fill and other activities, also as 
set forth in the Definitions section of this Article. 
13.242 Application and Submittal Requirements for Development 
Permit. 
Application for a development permit shall be made, on 
forms furnished by the Community Development Department 
and shall include the following. Actions which require a 
land use approval prior to a development permit shall 
include the required information as part of the land use. 
'>.'• application. 
(1) Plan drawn to scale showing the nature, location, 
dimensions and elevations of the area in question; 
• ." (2) Existing and proposed structures, manufactured housing 
pads, fill, storage of materials, drainage facilities, 
and the location of the foregoing items; 
- (3) Elevation in relation to mean sea level, of the lowest 
floor (including basement) of all structures; 
(4) Elevation in relation to mean, sea level of floodproofing 
in any structure; 
(5) Certification by a registered professional engineer or 
~ architect that the floodproofing methods for any non-
residentxal structure meet the floouproofing criteria in 
Section 13.262; 
(6) Description of the extent to which any watercourse will 
be altered or relocated as a result of the proposed 
development; 
(7) Existing and proposed roadways; 
(8) Area, location and finish elevations of all fill walls 
and rip-rap; 
(9) Location and elevation of stored materials; 
(10) Location and elevation of drainage facilities;- ( 
.(11) Location and elevation of utilities; and 
(12) Other plan requirements of this Code as applicable; 
13.243 Elevation Certification. All required elevations shall 
be tied into known bench marks shown on the: Flood 
Insurance Rate Map by a registered professional surveyor. 
Said surveyor shall attest to the procedure, bench marks 
used and accuracy of the required elevation over his 
signature and seal upon the required plan displaying the 
élévation information.~ 
13.244 Designation of Local Administrator. The Community 
Development Director is hereby appointed to administer 
and implement this Article by granting or.denying 
development permit applications in accordance with its 
provisions. 
13.245 Duties and Responsibilities of Director. The duties of 
the Director shall include, but not be.limited to, the 
following: 
( 1) Permit Review. 
(a) Review all development permits to. determine that the 
permit requirements and conditions of this article 
have been satisfied. 
(b.) Review all development permits to determine that all 
necessary permits have.been obtained from those 
Federal,. State or local governmental agencies from 
which prior.approval is required. 
. (c) Review all development permits to determine if the 
proposed development is located in the floodway. If 
located in the floodway, assure that the 
encroachment provisions of Section 13.270 are met. 
(2) Use of Other Base Flood Data (in A and V Zones). When 
base flood elevation data has not been provided as 
required by this article, the applicant shall obtain and 
the Director shall review and reasonably utilize any base 
flood elevation and floodway data available from a 
Federal, State or other source, in order to administer 
this article. 
(3) Information to be Obtained and Maintained by the 
Director. 
(a) Where base flood elevation data is provided through 
the Flood Insurance Study, Flood Insurance Rate 
Maps, or as required in Section (2) above: Obtain 
and record the actual elevation (in relation to mean 
sea level) of the lowest floor (including basements 
and below-grade crawlspaces) of all new or 
substantially Improved structures, and whether or 
not the structure contains a basement. 
(b) For all new or substantially improved floodproofed 
structures where base flood elevation data is 
provided through the Flood Insurance Study, FIRM, or 
as required in Section (2) above: 
(i) Verify and record the actual elevation (in 
relation to mean sea level); and 
(ii) Maintain the floodproofing certifications 
required in Section 13.242(5). 
(c) Maintain the records of all appeal actions and 
variances, and report any appeal actions or 
variances to the Federal Insurance Administration 
upon request. 
(d) Maintain for public inspection all records 
pertaining to the provisions of this ordinance. 
(4) Alteration of Watercourses. 
fa) Notify adjacent ..communities, the Oregon Department 
of Land Conservation and Development (the State's' 
NFIP Coordinating Agency), the Oregon Water 
Resources Department, and any other appropriate... 
state and federal agencies, prior to any alteration 
or relocation of a watercourse, and submit evidence 
of such notification to the Federal Insurance 
Administration. 
(b) Require that maintenance is provided within the 
altered or relocated portion of said watercourse so 
that the flood carrying capacity is not diminished. 
(5) Interpretation of FIRM Boundaries. Make interpretations 
and determinations where needed, as to exact location of 
the boundaries of the areas of special flood hazards (for 
example, where there appears to be a conflict between a 
mapped boundary, and actual field conditions). If the 
location of a boundary is contested, the person 
contesting the location of the boundary shall be given a 
reasonable opportunity to appeal the interpretation or 
determination as provided in this article. Such appeals 
shall be reviewed consistent with the standards of this 
code and Section 60.6 of the Rules and Regulations of the 
National Flood Insurance Program (44 CFR 59-76). 
(6) Location o,f FIRM Boundaries and Elevations. 
(a) Make all information relating, to.the 100-year flood 
plain and floodway location and elevations available 
to the applicant, including the Flood Insurance 
Study with flood sections, the Flood Insurance Rate 
Maps showing flood elevations and elevation data 
reference points, and other floodplain development 
surveys in the immediate vicinity. 
(b) Certify that the location of the floodway and 100-
year flood plain,, and existing and proposed 
elevations, have been made for the applicant by a 
professional land surveyor registered in Oregon, and 
that the signature and seal are affixed certifying 
the accuracy of' such determination. 
(c.) . Certify that the finished floor elevations, and 
other finished elevations of the. proposal affecting 
the floodway or 100-year flood plain have been 
constructed or developed to . the approved elevations', 
as certified by a registered professional surveyor 
over, his signature, and seal. 
(d) Upon request, provide the information in this 
Section to the applicant, applicant's lender and/or 
insurance agent.. 
-(e) Should an applicant pursue a change in floodplain. or 
. floodway designation.from the Federal Emergency 
- . . Management Agency,.assist the applicant with 
information about the process. 
Variances. Variances to the provisions of this Article 
shall be processed in accordance with the procedures of 
Article 2 and the provisions of Article 6 of this Code. 
Any variance to the Flood Hazard provisions of this 
Article shall include a recommendation of the City 
Engineer as specified in Section 6.060(B)(11) and shall 
address the additional provisions of this Section, except 
as provided in Subsection (3) of this Section. 
Factors to Consider. The review body shall consider all. 
technical evaluations, all relevant factors, and 
standards specified in this Article, and the following: 
(a) The danger that materials may be swept onto other 
lands to the injury of others; 
(b) The danger to life and property due to flooding or 
erosion damage; 
(c) The susceptibility of the proposed facility and its 
contents to flood damage and- the effect of such 
damage on the individual owner and occupants; 
(d) The importance of the services provided by the 
proposed facility to the community; 
(ej The necessity to the facility of a waterfront 
location, where applicable; 
(f) The availability of alternative locations for the 
proposed use which are not subject to flooding or 
erosion damage; 
(g) The compatibility of the proposed use with existing 
and anticipated development; 
(h) The relationship of the proposed use to the 
comprehensive plan and floodplain management 
program; 
(i) The safety of access to the property in times of 
flood for ordinary and emergency vehicles; 
(j) The expected heights, velocity, duration, rate of 
:ri-se, and sediment transport of the flood waters and 
the effects of. wave action, if applicable, expected 
at the site; and 
(k) The costs of providing governmental services during 
and after flood conditions, including maintenance 
. and repair of public utilities and facilities such 
. as' sewer, "gas, electrical,, and water systems, and 
streets' and" bridges . 
Additional Guidelines and Requirements for Variances, to 
the Provisions, of this Article. In addition to the 
variance criteria in Article 6, the review body shall 
address the provisions, of this Section. 
(a) Generally, the only condition under which a variance 
from the elevation standard may be issued is for new 
construction and substantial improvements to be 
erecced on a lot of one-haIf ac^e or less in size 
contiguous to and surrounded by lots with existing 
structures constructed below the base flood level, 
providing the iterns in Subsection (1) of this 
Section have been fully considered. As the lot size 
increases, the technical justification required for 
issuing the variance increases. 
(b) Variances shall not be issued within a designated 
floodway if any increase in flood levels during the 
base flood discharge would result. 
(c) Variances shall only be issued upon a determination 
that the variance is the minimum necessary, 
considering the flood hazard, to afford relief. 
(d) Variances to the provisions of this Article shall 
only be issued upon findings of: 
(i) A showing of good and sufficient cause; 
(ii) A determination that failure to grant the 
variance would result in exceptional hardship 
to the applicant; 
(iii)A determination that the granting of the 
variance will not result in increased flood 
heights, additional threats to public safety, 
or extraprdinary public expense; create 
nuisances; cause fraud on or victimization of 
the public in consideration of the factors of 
Subsection (1) of this Section; or conflict 
with existing local laws or ordinances. 
(e) Variances as interpreted in the National Flood 
Insurance Program are based on the general zoning 
law principle that, they pertain to a physical piece 
of. property; they are not personal in nature and do 
not pertain to the structure,. its inhabitants, 
-.economic or financial circumstances. They primarily 
address small lots in densely populated residential 
neighborhoods. As such, variances from the flood 
-elevations should be quite rare. 
-(f) ..Variances may be issued for non-residential 
buildings in very limited circumstances to allow a 
lesser degree of flood-proofing than watertight ox 
; dry-proofing, where..it can .be determined, that such 
.aqtion will have low damage potential, comply with 
all other provisions of this Subsection other than 
(a), and otherwise comply with the provisions of 
Section 13.252 (Anchoring) and 13.253 (AH Zone 
Drainage). 
(3) Exceptions ror Historic Properties. Variances may be 
issued for the reconstruction, rehabilitation, or 
restoration of structures listed on the National Register 
of Historic Places or the Statewide Inventory of Historic 
Properties in accordance with Article 6, without regard 
to the additional provisions of Subsections (1) and (2) 
of this Section. In such case, the variance shall be 
part of the review and approval by the Historic Buildings 
and Sites Commission required in Article 13.400 of this 
Code. In addition: 
(a) Such variances shall be only the minimum deviation 
from NFIP criteria that is necessary to assure that 
the historic character and design is not destroyed; 
and 
(b) The variance must not preclude the continued 
designation of the structure as an historic 
structure. 
Any measures that can be taken to reduce future flood 
damage consistent with this Subsection shall be required, 
such as elevating an air conditioner or using flood-
resistant materials. 
(4) Conditions Attached to Variances. Upon consideration of 
the factors in Subsection (1) and the purposes of this 
Code and Article, if à variance is granted, the review 
body may attach conditions to the variance as it deems 
necessary to further the purposes of this Code. 
(5) Notification of Effect on Flood Insurance Rates. Any 
applicant to whom a variance is granted shall be given 
written notice that the structure will be permitted to be. 
built with a lowest floor elevation below the base flood 
elevation and that the cost of flood insurance will be 
commensurate with the Increased risk resulting from the 
reduced floor elevation. 
(6) Record-Keeping. The Director shall maintain the records 
of all variances and- shall report any variances to the 
Federal Insurance Administration upon request. 
13.247 Appeals. Appeals to Interpretations of the provisions of 
this Article or determinations regarding the application, 
of the provisions of this Article shall be undertaken in 
as provided in Article 10 of this Code. The Director 
shall maintain the records of all appeal actions and 
shall report any appeal actions to the Federal Insurance 
Administration upon request. 
13.250 Provisions for Flood Hazard Reductio^ 
13.251 General Standards. In all areas of special flood 
hazards, the standards set forth in this Article are 
required. 
13.252 Anchoring. 
(1) All new construction and substantial improvements shal1 
be anchored to prevent flotation, collapse, or lateral 
movement of the structure. 
(.2) All manufactured homes shall likewise be anchored to 
prevent flotation, collapse or lateral movement, and 
shall be installed using methods and practices that 
minimize flood damage. Anchoring methods may include, 
but are not limited to, use of over-the-top or frame ties 
to ground anchors (Reference FEMA's "Manufactured Home 
Installation in Flood Hazard Areas" guidebook for 
additional techniques). 
13.253 AH Zone Drainage.. Adequate drainage paths are required 
on slopes to guide floodwaters around and away from 
proposed structures. 
13.254 Construction Materials and Methods. 
(.1) All new construction and .substantial improvements shall 
be constructed with materials and utility equipment 
resistant to flood damage. 
(2) All new construction and . substantial improvements shall 
• be constructed using methods and. practices that minimize 
flood damage. . 
(3) Electrical, heating, ventilation, plumbing, and air 
conditioning equipment :an.d other service, facilities -shall 
be designed and/or otherwise, elevated or located so as to 
prevent water from entering or accumulating within the 
components during conditions of flooding. 
13.255 Utilities and- Services. 
(1) All new and replacement water supply systems.shall be-.- ; 
designed.to minimize or eliminate infiltration of 
floodwaters into the system; . . 
(.2) New and replacement sanitary sewage, systems shall be 
designed to minimize or eliminate infiltration of 
floodwaters into the systems and discharge from the . 
systems into floodwaters; . -
(3) On-site waste disposal systems shall be located to avoid 
impairment to them or contamination from them during 
flooding consistent with the requirements of the Oregon 
Department of Environmental Quality; 
13.256 Subdivision and Development Proposals, Partitions, and 
Planned Unit Developments. 
No proposed subdivision or partition of land or planned 
unit development plan, or other development located 
within an area of special flood hazard shall be approved 
without meeting the requirements of this article. All of 
the applicable mapping and certification requirement's of 
this article shall be met at the Tentative. Map, Plat or 
Plan stage of review for subdivisions, partitions, and 
planned unit developments (See also Article 17, Lots and 
Creation of Lots, and Article 18, Planned Unit 
Development.) 
(1) All development proposals, including subdivision 
proposals, shall be consistent with the need to minimize 
flood damage; 
(2) All development proposals, including subdivision 
proposals, shall have public utilities and facilities 
such as sewer, gas, electrical, and water systems located 
and constructed to minimize or eliminate flood damage; 
(3) All development proposals, including subdivision 
proposals, shall have adequate drainage provided to 
reduce exposure to flood damage; and 
(4) Where base flood elevation data has not been provided or 
is not available from another authoritative source, it 
shall be generated for development.proposals, including 
subdivision proposals, which have the potential for 5 
dwelling units or more or contain 1 acre or more, 
whichever is less. 
13.257 Review Where Elevation Data Not Available. Where 
elevation data is not available through the Flood 
Insurance Study FIRM, or another authoritative source, 
applications for building permits shall be reviewed to 
assure that proposed construction will be reasonably safe 
from flooding. The test of reasonableness is a local 
judgment and includes use of historical data, high water 
marks, photographs of past flooding, etc.., where 
available; Failure to elevate the lowest floor at least 
two feet above grade in these zones may result in higher 
insurance rates. 
13.260 Specific Standards. 
In all areas of special flood hazards where base flood 
elevation data has been- provided (Zones Al-30, AH, and 
AE) as set forth in Section 13.232 (Basis for 
Establishing the Areas of Special Flood Hazard) or 
Section 13.245(2) (Use of Other Base Flood Data), the 
following provisions are required. 
13.261 ,Residential Construction. 
(1) . New construction and substantial improvement of any 
residential structure shall have the lowest floor, 
including basement, elevated to a minimum of one foot 
above the base flood elevation. 
(2) Fully enclosed areas below the lowest floor that are 
subject to flooding are -prohibited, or shall be designed 
to automatically equalize hydrostatic flood forces on 
exterior walls by allowing for the entry and exit of 
floodwaters. Designs for meeting this requirement must 
either be certified by a registered professional engineer 
or architect or must meet or exceed the following minimum 
criteria: 
; (a). A minimum of two openings having a total net area of 
not less than one square inch for every square foot 
of enclosed area subject to flooding shall provided. 
(b) The bottom of all openings shall be no higher than 
one foot.aboye grade. 
, (c) Openings may be equipped with screens, louverg, or 
other coverings or devices provided that they permit 
the automatic entry and exit of floodwaters. 
13,2.62 Non-Residential Construction.. 
(1) New construction and substantial improvement of any 
commercial, industrial or other non-residential structure 
: . .shall either have the lowest floor, including, basement, 
elevated to a minimum of one foot above the.base flood 
/elevation; or, together with attendaint utility and 
• sanitary -facilities, shall: 
- (a) Be floodproofed so that the. structure is watertight. 
'with walls substantially impermeable to the passage 
of. water to a level of one foot above, the base flood 
elevation; 
(b) Have structural components capable of resisting 
hydrostatic and hydrodynamic loads and effects of 
buoyancy; and 
(c) Be certified by a registered professional engineer 
or architect that the design and methods of 
construction are in accordance with accepted 
standards of practice for meeting provisions of this 
section based on their development and/or review of 
the structural design, specifications and plans. 
Such certifications shall also provide that the 
provisions of 13,254 are satisfied. Such 
certifications shall be provided to the Director as 
set forth in Section 13.245(3)(b) . 
The certification by a registered professional 
engineer or architect shall specify that the 
floodproofed methods for any commercial or 
industrial structure are adequate to withstand the 
flood depths, pressures, velocities, impacts and 
uplift forces and other factors associated with the 
base flood. 
(2) Non-residential structures that are elevated, not 
floodproofed, must meet the same standards for space 
below the lowest floor as described in Section 13.261(2). 
(3) Applicants floodproofing non-residential buildings shall 
be notified that flood insurance premiums will be based 
on rates that are one foot below the floodproofed level 
(e.g. a building floodproofed to the base flood level 
will be rated as one foot below that level)'. 
13,263 Manufactured Homes. 
(1) -All manufactured homes to be placed or substantially 
improved oh sites listed below shall be elevated on a 
permanent foundation such that the finished floor of the 
manufactured home is elevated to a minimum of 18 inches 
(46 cm) above the basé flood elevation and be securely 
anchored to an adequately designed foundation system to 
rèsist flotation, collapse, and lateral movement: 
• (NOTE: See 2.002 Oregon Manufactured Dwelling and Parks 
-Specialty Code., Chapter 3 Manufactured Dwelling 
. Installations and Chapter 10 Manufactured Dwelling Park 
• Construction. That code also includes the following 
provisions: 3-2.4.1. (b) 1 requires that the top of the 
dwelling stand be at least one foot above base flood 
elevation unless openings are provided per FEMA Technical 
• Bulletin 1-93. 10-2/2(d) specifies that manufactured 
dwelling parks or park expansions shall not be permitted 
in a flood hazard area unless the stands are elevated 
above the base flood elevation). 
(a) Outside of a manufactured home park or manufactured 
home subdivision; 
(b) In a new manufactured home park or manufactured home 
subdivision; 
(c) In an expansion to an existing manufactured home 
park or manufactured home subdivision; 
(d) In an existing manufactured home park or 
manufactured home subdivision on which a 
manufactured home has incurred "substantial damage" 
as the result of a- flood. 
(2) Manufactured homes to be placed or substantially improved 
on sites in.an existing manufactured home park or 
manufactured home subdivision within Zones Al-30, AH, and 
AE on the community's FIRM that are not Subject to the 
above manufactured home provisions shall be elevated so 
that either: 
(a) The finished floor of the manufactured home is 
elevated to a minimum of 18 inches (46 cm) above the 
base flood elevation; or 
(b) The manufactured home chassis is supported by 
reinforced piers or other foundation elements of at 
least equivalent strength that are no less than 36 
inches in.height above grade.and be securely 
anchored to an adequately designed foundation system 
to resist flotation, collapse, and lateral movement. 
13.264 • Recreational Vehicles.» Any recreational vehicle placed 
on a site within Zones Al-30AH, AE shall either: 
(1) be on the. site for fewer than 180 consecutive days; 
(2) be fully licensed and ready for highway use,, on its . 
wheels or jacking.system, attached to.the site only by 
quick disconnect type utilities and security devices,. . 
with no permanently attached .additions; 
. (3) . meet the requirements of 12=. 263 above and the elevation 
and anchoring requirements for manufactured homes; or 
(4) be stored within a fully enclosed building that is 
floodproofed or elevated in.accordance with the 
requirements of Section 13.262. 
Nothing in tne Sect ion is intended to authorize the use 
of a recreational vehicle in a manner otherwise 
prohibited by this Code or other laws. 
13.2 65 Crawlspaces and Below-Grade Crawlspaces. At-grade 
crawlspaces are the preferred method of crawlspace 
construction within flood hazard areas. However, below-
grade crawlspaces are permitted, and are not considered 
basements, if all of the following are satisfied. See 
Figures 13-1, 13-2 and 13-3. 
Otherwise, below-grade crawlspaces are considered 
basements and subject to applicable requirements for 
basements. A basement floor is considered the lowest 
floor (see definition) and must meet requirements for the 
lowest floor. 
(1) Except as provided in this paragraph, because of 
hydrodynamic loads, the velocity of floodwaters at the 
site shall not exceed.5 feet per second where a below-
grade crawlspace is used. For velocities in excess of 5 
feet per second, other foundation types shall be used, or 
the design shall be approved and stamped by a qualified 
registered architect or professional engineer. . Other 
types of foundations are recommended for these areas. 
The determination of velocity shall be- based on the mean 
floodway velocity in Table 6 of the Flood Insurance Study 
for Josephine County and Incorporated Areas with a 
December 3, 2:009 effective date where that information is 
available. 
In areas where the mean floodway velocity may exceed 5 
feet per second and flood velocity information is not 
available, such as for-the floodway fringe, flood 
Velocity at the building site shall be determined by an 
engineer knowledgeable in hydraulics and hydrology who is 
qualified to determine flood-velocities at the building 
Site, unless the Building Official determines flood 
•velocities at the. building site do not exceed 5 feet per 
second based on accepted practices or presumptive 
determinations in accordance with NFIP standards. 
(2) .The building must be designed and adequately anchored to 
resist or eliminate flotation, collapse, and lateral 
movement of the structure resulting from hydrodynamic and 
hydrostatic loads, including the effects of buoyancy. 
Hydrostatic loads and. the effects of buoyancy can usually 
be addressed through the required openings described in 
Subsection (3) of this Section. \ 
{3) Below-graae crawlspaces (and other crawlspaces designs) 
are enclosed areas below the base flood elevation (BFE) 
and, as such, must have openings that equalize 
hydrostatic pressures by allowing the automatic entry and 
exit of floodwaters. The bottom of each flood vent 
opening shall be no more than 1 foot above the lowest 
adjacent exterior grade. 
( 4 ) For all crawlspaces, portions of the building below base 
flood elevation shall be constructed with materials 
resistant to flood damage. This includes not only the 
foundation walls of the crawlspace used to elevate the 
building, but also, any joists, insulation,, or other 
materials that are below the base flood elevation. If 
flood-resistant materials are not used for building 
elements, those- elements shall be elevated -above base 
flood elevation. The recommended construction practice 
is to elevate the bottom of joists and all insulation at 
least one foot above base flood elevation. Most types of 
insulation are not flood-resistant materials. 
Flood-resistant materials shall be determined and where 
used, shall be in accordance with FEMA Technical Bulletin 
2, Flood Damage-Resistant Materials Requirements, August 
2008, or as revised. 
(5) Any building utility systems within a crawlspace shall be 
elevated above BFE or.designed so that floodwaters cannot 
enter or accumulate within, the system components during 
flood conditions. Ductwork, in particular,- must either 
be placed above the base flood elevation or sealed from 
floodwaters. 
FEMA Bulletin 34 8, Protecting Building Utilities from 
Flood Damage, provides detailed guidance on designing and 
constructing, flood-res is tarit utility systems.. . 
(NOTE:. Section R324.1.5 of the residential "Building Code 
also addresses mechanical and electrical systems.. 
Section 7 and. Table 7-1 of. AS CE Standard 24-05, Flood 
Resistant Design and Construction, also address utility 
.requirements and may include requirement for elevation" 
higher than base flood elevation for certain situations). 
(6) The interior" grade of a below-grade crawlspace below.the 
base flood elevation shall not be more than 2 feet below 
thé., lowest adjacent exterior grade as shown in Figure 13-
3. 
(7) The height of a below-grade crawlspace,. measured from the 
. interior grade of the crawlspace to the top of the 
crawlspace foundation wall shall not exceed 4 feet at any 
point as shown in Figure 13-3. The'height limitation is 
the maximum allowable unsupported wall height according 
to the engineering analyses and building code 
requirements for flood hazard areas. 
(8) The drainage system shall be designed to remove 
floodwaters from the interior area of the crawl-space in a 
maximum time of 72 hours. The type of drainage system 
will vary because of the site gradient and other drainage 
characteristics, such as soil types. Options include, 
but are not limited to, natural drainage through porous, 
well-drained soils, drainage systems such as perforated 
pipes, drainage tiles, or gravel or crushed stone 
.... drainage., by .gravity, ox., mechanical ..means . The drainage, 
system shall be a system approved by the Building 
Official or shall be designed and stamped by the 
applicant's engineer. 
(NOTE: Buildings that have below-grade craw I.spaces will 
have higher flood insurance premiums, than buildings that 
have the preferred crawlspace construction with the 
interior elevation at or above the lowest adjacent grade, 
even when the ..crawlspace meets the requirements of this 
section and FEMA Technical Bulletin 11-01. Buildings 
with below-grade "crawlspac.es currently cannot be rated by 
an insurance agent .using the NFIP Flood Insurance Manual. 
They must be submitted for a:special rating under the 
"Submit-to-Rate" process by underwriters knowledgeable in 
this type: of construction) . 
Figure 13-1. Preferred Crawlspace Construction 
Figure 1^-2. Below-Grade Crawlspace Construction 
Figure 13-3. Requirements for Below-Grade 
Crawlspace Construction 
Roar Joist 
L = 4ft Maximum-
D'= 2 ft'Maximum 
Crawlspace 
Interior Grade 
7 — W r r ^ T T 
ïp: 
-Lowest Floor f Foot Above BFE 
.Portions of BuMng/Ulililies Below BFE Shall Be 
Resistant io Flood Damage/Sealed frani FtoOdwatera 
- Foundation Wall 
-Flood Vent 
Lowest Adjacent 
Exterior Grade (LAG) 
i 'f 
13.270-• Floodways. 
Located within, areas of special flood hazard are areas 
designated as .floodways. Since the floodway is an 
extremely hazardous area due to the velocity, of 
floodwaters which- carry debris, potential projectiles, 
and erosion potential, the - provisions of this Section 
apply. 
13;271 Designated Floodways. 
(1) Except as.provided in Section. (3) below, encroachment, 
•..fill, new construction, substantial improvements or other 
development shall not occur within a floodway designated 
by Flood Insurance Study or Flood Insurance1 Rate Maps 
unless a tecnnical evaluation is performed and certified 
by a registered professional civil engineer, and 
demonstrates through hydrologie and hydraulic analysis 
performed in accordance with standard engineering 
practice that encroachments, including any surrounding 
property modifications or improvements, shall not result 
in any increase in flood levels during the occurrence of 
the base flood discharge. 
(2 ) If subsection fl) is satisfied, all new construction and 
substantial improvements shall comply with all applicable 
flood hazard reduction provisions of this code. 
(3) Projects for stream habitat restoration may be permitted 
in the floodway provided: 
(a) The project qualifies for a Department of the Army, 
- Portland District Regional General Permit for Stream 
Habitat Restoration (NWP-2007-1023); and 
(b) A qualified professional (a Registered Professional 
Engineer-; or staff of NRCS ; the county, or 
fisheries, natural resources, or water resources 
agencies) has provided a feasibility analysis and 
certification that the project was designed to keep 
any rise in 100-year flood level as close to zero as 
practically possible given the goals of the project; 
-and 
(c) No structures would be impacted by a potential rise 
in flood elevation; and 
(d) An agreement to monitor the project, correct 
problems, and ensure that flood carrying capacity 
remains unchanged is included as part of the local 
approval. 
(-4) New installation of manufactured dwellings is prohibited, 
except as provided in this Section (as regulated by the 
2002 Oregon Manufactured Dwelling and Park Specialty 
Code). Manufactured dwellings may only be located in 
floodways according tb one of the following conditions : 
(a) If the manufactured dwelling.already exists in the 
floodway,. the placement" was permitted at the time of 
the original installation, and the continued use is 
not a threat to life, health, property, or thé 
general welfare of the public; or 
(b) A new manufactured dwelling is replacing an.existing 
manufactured dwelling whose original placement was 
permitted at the time of installation and the 
replacement home will not be a threat to life, 
health, property, or the general welfare of the 
public, and it meets the following criteria: 
(i) As required by 44 CFR Chapter 1, Subpart 
60.3(d)(3), it must be demonstrated through 
hydrologie and hydraulic analyses performed in 
accordance with standard engineering practices 
that the manufactured dwelling and any 
accessory buildings, accessory structures, or 
any property improvements (encroachments) will 
not result in any increase' in flood levels 
during the occurrence of the base flood 
elevation; 
(ii) The replacement manufactured dwelling and any 
accessory buildings or accessory structures-
(encroachments) shall have the finished floor 
elevated a minimum of 18 inches (46 cm) above 
the base flood elevation as identified on the 
Flood Insurance Rate Map; 
(iii)The replacement manufactured dwelling is placed 
and secured to a foundation support system 
designed by an Oregon professional engineer or 
architect and approved by the Community 
Development Department; 
(iv) The replacement manufactured dwelling, its 
foundation supports, and any accessory 
buildings, accessory structures, or property 
improvements (encroachments) do not displace 
water to the degree that it causes a rise in 
the water level or diverts water in a manner 
that causes erosion or damage.to other 
properties; 
(v) The location, use,, and improvements of a 
replacement manufactured dwelling complies with 
all provisions of this Code, other applicable 
Codes, and any conditions of approval; and 
13.272 Floôdways Not Designated. 
(1) In areas where a regulatory floodway has not- been 
designated in the Flood Insurance Study or on the Flood. 
Insurance Raté Maps, no new construction, substantial 
improvements, or other development (including fill) shall 
be permitted within Zones Al-30 and AE on the Flood 
Insurance Rate.Map, unless it is demonstrated that the 
cumulative effect of the proposed development, when 
combined with all other existing and anticipated 
development, will not increase the water surface 
elevation of the base flood more than one foot at any 
point within the community. 
(2) Development shall not occur on any floodplain lands, 
where a floodway has not been designated for that reach 
of. a stream or river in the Flood Insurance Study 
referenced in Section 13.232 of this Code unless: 
(a) The Director has evidence which in his judgment 
would indicate the proposed development site is 
located in an area of shallow flooding, and the 
proposed development complies- with the provisions of 
Section 13.280 and will not divert the flood or 
cause a rise in the level of the discharge above the 
base flood elevation; or 
(b) A technical study is completed which establishes the 
probable location of the floodway as defined in this 
Code, and the proposed development complies with the 
applicable provisions of this Code', whether it is 
within the floodway or the floodway. fringe. 
(3) If a technical study is completed under the requirements 
of this section, demonstrating that the encroachment will 
not increase the. flood levels, any permitted construction 
or substantial improvements shall comply with all other 
applicable standards of this Code. 
13.280 Standards for Shallow Flooding Areas (AO Zones). 
Shallow flooding areas appear on Flood Insurance Rate 
Maps as AO zones with depth designations. The base flood 
depths in these ones range from 1 to 3 feet above ground 
where a clearly defined channel does not exist, or where 
the path of flooding is unpredictable and where velocity 
flow may be evident. Such flooding is usual 1y 
characterized as sheet flow. In these areas, the 
following provisions apply: . 
(1) Residential Structures. New construction and substantial 
improvements of residential structures and manufactured 
homes within AO zones shall have the lowest floor. 
(Including basement) elevated above the highest grade 
adjacent to the building, a minimum of one foot above the 
depth number specified on the Flood Insurance Rate Map, 
or at least two feet above the highest grade adjacent.to 
the building if no depth number is specified. 
(2) Nonresidential Structures. New construction and 
substantial improvements of nonresidential structures 
within AO zones shall either: 
(a) Have the lowest floor (including basement) eLevated 
above the highest adjacent grade of the building 
site, a minimum of one foot above the depth number 
specified on the Flood Insurance Rate Map, or at 
least two feet above the highest grade adj acent to 
the building if no depth number is specified; or 
(b) Together with attendant utility and sanitary 
facilities-, be completely floodproofed to a minimum 
of one foot above the depth number specified on the 
Flood Insurance Rate Map, or at least two feet above 
the highest grade adj acent to the building if no 
depth number is specified, so that any space below 
that-level is .watertight with walls substantially 
impermeable to the passage of water and with 
structural components having the capability of 
resisting hydrostatic and hydrodynamic loads and 
effects of buoyancy. If this method is used, 
. compliance shall be certified by a registered 
professional engineer or architect as in Section 
-. 13.26,2. 
13.290 Critical Facilities and Essential Facilities 
13.291 Critical Facilities. 
(1) It is recommended that construction of new critical 
facilities is/ to the extent possible, located outside 
the limits of the Special Flood. Hazard Area. (SFHA) also 
known as the 100-year floodplain, 
(2) It is recommended that construction of new critical 
facilities occur within the SFHA only if no feasible 
alternative site is' available. 
(3) The following are .recommended when .Critical Facilities 
are constructed within-the SFHA'.. . Recommendaitions in this 
Section do not affect other mandatory.provisions of this 
Code or other .applicable codes. 
. (a) It. is recommended that Critical. Facilities 
cpnstructed; within-the SFHA have.the ;lowest floor 
. , elevated a minimum of three feet or to the height of 
..the of the 500-year, flood, whichever is higher. 
(b) It is recommended that access to and. from the 
critical facility should also be protected to the 
height utilized above. When, those heights are not 
feasible, .it is at least -recommended that access 
routes, be .elevated to .or.above the' level <of the base 
flood elevation to all critical facilities to the 
extent possible. 
(4) Floodproofing and sealing measures should be taken to 
ensure that toxic substances will not be displaced by or 
released into floodwaters. 
13.292 Essential Facilities. 
(1) Siting and construction of Essential Facilities, as 
defined in the State Building Code, shall comply with the 
applicable provisions of the State Building Code, and 
other documents adopted by reference in the State 
Building Code, such as the ASCE Standards. 
SAFEGUARDS FROM HAZARD AREAS 
Geologic Hazard Areas 
Since there is no recent record of any geologic activity in the region, it is reasonable to assume that 
development may proceed without implementing safeguards such as earthquake design or avoidance 
of location on fault lines. 
Slope Hazard Areas 
The most effective method for the city and county to minimize the hazards of development on steep 
slopes is to review the development process, Slopes in the excess of 35% should be considered 
hazardous areas. Development that is proposed on slopes greater than 35% should be required to 
have development plans approved by a licensed engineering geologist in order to ensure that soil 
erosion and earth movement hazards will be minimized. A review of hillside developments on 
slopes 15% to 35% should be made by an engineer and a soil scientist in order to minimize the 
hazards to the structure and to reduce the potential for erosion. Supplemental engineering and site 
design may be required to lessen the degree of risk. 
Soil Hazard Areas 
In the preceding subsection, the various soils within the UGB area are inventoried according to a set 
to characteristics that relate the properties of each soil to specific hazards. 
Safeguards for each hazard are primarily related to regulations that protect the stability of the soil and 
the major hazard for most soils. Once significant soil erosion ¡begins in an area, drastic and costly 
"stop-gap" measures must be implemented to arrest the rate of erosion. Preventive measures for soil 
stability on erodible soils is often the best approach. Such preventive measures are: 
• traps to keep top soil on the.site 
• leaving natural vegetation in place 
• reducing surface water run-off with vegetative planting and keeping natural water 
retention areas. 
Shrink-swell and road building hazards can .be safe-guarded with adequate design and site 
preparation. An important task is to ensure that builders and developers are made aware of the soil 
properties of the site or area before planning and construction-begin. The soil mappinjg and inventory 
of this section should serve as adequate generalized information regarding the hazards of soils within 
the UGB area. Site specific analysis of the soils should be encouraged in sensitive areas where soils 
are exposed to weathering and/or where slopes are steeper than 35% percent. 
The relationship between steep topography, soils and natural vegetation becomes increasingly 
delicate as the percentage of slope increases. This delicate balance is strongly affected by human 
actions in developing or preparing sites for development. Extensive excavations for cut and fills, 
premature removal of natural vegetation and the additional load placed on a hillside by development 
can lead to earth movement in the form of slope erosion or mass movement. 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 12 
<L 
5.30 FLOOD HAZARD 
PURPOSE 
The purpose of this section is to describe the history of flooding in the urban growth boundary area, 
identify the flood-prone areas, evaluate the degree of hazard, and describe the appropriate safeguards 
from flooding. 
HISTORY OF FLOODING 
The earliest recorded flood in Josephine County occurred in 1861. Since no subsequent flood has 
surpassed the magnitude of that flood, it has been chosen to represent the "100 year flood." (Army 
Corps of Engineers) Flood magnitudes are rated by their chance of annual occurrence. A " 100 year 
flood" is assumed to have a 1 % chance of occurring each year. A " 1 year flood" is assumed to have a 
100% chance of occurring each year. These are mathematical relationships that ignore the natural 
variables which affect the weather. Table 5.30.1 depicts the major floods of the Rogue River at 
Grants Pass during the last 1.20 years. 
TABLE 5.3.1 
Major Floods of the Rogue River at Grants Pass 
mm/UÈrnanm 
Nov. - Dec., 1861 175,000 cfs ("100 year") 
Feb., 1890 160,000 cfs 
Feb., 1907 60,500 cfs 
Nov., 1909 . 70,000 cfs 
Feb., 1927 138,000 cfs 
Dec., 1942 54,400 cfs 
Dec., 1945 70,000 cfs 
Jan., 1948 59,900 cfs 
Oct., 1950 . 65,400 cfs 
Jan., 1953 77,000 cfs 
Dec., 1955 135,000 cfs 
Dec., 1964 152,000 cfs ("50 year") 
Dec., 1972. 82,500 cfs 
Dec., 1974 96,400 cfs 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 13 
The table reveals that there is little mathematical order to the occurrence of floods. Floods of 
similar magnitude can occur within a few years of each other, such as the February 1907 and 
November 1909 floods and the October 1950 and January 1953 floods. Floods of relatively great 
magnitude can occur within a decade of each other, such as the December 1955 and December 1964 
floods. The long range forecasting of flood occurrences would seem able to predict only that floods 
will occur at random intervals and at varying magnitudes. 
FLOODPRONE AREAS 
The Rogue River flows through the approximate center of the Urban Growth Boundary area. There 
are five confluent creeks that discharge into the Rogue River within the UGB. Map 5.30.3 shows the 
UGB and the floodprone areas (shaded). The actual areas of special flood hazard are identified 
by the Federal Emergency Management Agency in a scientific and engineering report titled 
"Flood Insurance Study" with the accompanying Flood Insurance Rate Maps for Josephine 
County and Incorporated areas effective date December 3,2009, and any revision. These areas 
were subject to flooding during the 1964 flood. Note that flood levels protruded into the channels of 
Gilbert and Allen Creeks. This phenomenon occurs because the flood level of the river is at a high 
elevation and the flood waters of the creeks are effectively "dammed" by river water. Water always 
seeks mean sea level and, therefore, is always flowing to the ocean. When the creeks are dammed by 
the river, then they overflow their banks upstream and water flows in sheets over the surface of the 
land in its relentless search for sea level. Therefore, the confluent creeks of the UGB area are also 
prone to a flood hazard relative to the magnitude of the river flooding. 
DEGREE OF FLOOD HAZARD 
The degree of flood hazard is measured in terms of loss of life and property. No deaths from 
flooding in the Grants Pass area are noted in the literature. Flood warnings usually occur in time to 
prevent loss of life* as people are able to move out of the floodprone areas. However, real property 
and improvements such as buildings are subject to the forces of flooding water. A quote from the 
Postflood Report, December 1964 Flood (Army Corps of Engineers) can dramatically relate the 
damages to property by flooding. 
"One. of the major factors causing excessive damages during this flood was the enormous quantity of 
debris brought into the channel from every source. This debris collected behind bridges resulting in 
the complete destruction of several, and major damage to nearly ever other bridge across the main 
stream. It also contributed to residential damage all along the river, knocking buildings from their 
foundations or smashing into walls." 
Within the UGB area, residential areas on both sides of the river were flooded up to 8 feet. 
(Postflood Report, 1964. Army Corps of Engineers). The city sewage treatment plant sustained 
damages estimated at about $65,000. The Postflood Report did not summarize the value of 
residential damage but did state the values of the home flooded to be between $30,000 and $50,000 
per home and estimated the average residential damage to be $900 per residence. Exhibit 5.30.2 
shows'an aerial view of the flooding of 1964. 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 14 
EXHIBIT 5.30.2 
Aerial View of 1964 Flood 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 15 
SAFEGUARDS FROM FLOODING 
Safeguards from flooding that can be implemented at the local level are warning systems, land use 
regulations and the Federal Flood Insurance Program. 
Warning Systems 
The Army Corps of Engineers operates a computer simulation model for the hydro logical 
characteristics of all the significant water drainage basins in Oregon. That simulation model can 
predict fairly accurately when a flooding river system will "crest", or reach its highest flooding 
elevation, and what the elevation will be at the "crest." That information is provided to all radio 
stations and local emergency units like the police and national guard. If elevations of floodprone 
areas are known by recognized landmarks, then people and mobile property can be removed from the 
anticipated flooding area. An emergency evacuation program that employs local police, fire 
department and other civic groups can help facilitate the relocation of persons and property from a 
floodprone area. 
Land Use Regulations 
The City and/or County can regulate the use of land within known floodprone areas. The regulations 
can range from allowing no development in floodprone areas to allowing any type of development in 
conjunction with federal floodplain laws. The regulations can also selectively designate floodprone 
areas as public open space for parks, wildlife areas and floodways. Public open spaces would allow 
active public use of the land and enhance the attractiveness and livability of the Urban Growth 
Boundary Area, while reducing fixture potential losses of life and property from flooding. 
Land use regulations can also be used to set aside land areas for the detention of storm water. Those 
lands, such as wetlands, grassed waterways, and woodlands, may reduce flood elevations of the 
frequent small floods, and prevent fixture increases in flood heights of these frequent floods. 
Flood heights have the potential for increase in proportion to the increases in urban level 
development in the Boundary area. Urban development increases the amount of storm water runoff 
by increasing the area of impervious surfaces such as streets, driveways, parking lots, and rooftops. If 
the natural storm water detention areas of the UGB area are converted to impervious surfaces by 
urban development, then the storm water runoff will flow more rapidly over the surface, into 
stormdrairis and on to the creeks and the river, thereby increasing the elevation of the flood and/or 
decreasing the elapsed time between the beginning of the flood and the flood "crest". 
Land use regulations can provide equitable transfers of land use intensities for each land use type 
from the floodprone areas and storm water detention areas to other less sensitive areas. 
For example, a proposed residential development in an area with potential for storm water detention 
may be encouraged to preserve the detention area through incentives encouraging the transfer of 
density. The potential number of dwelling units that, can be built on the detention area may be 
transferred to the remaining buildable area of the land that has less potential for detention. In this 
way, the developer retains the revenue potential of the development, and may even reduce the costs 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 16 
of development by clustering. The community retains an open space and a storm water detention 
area, reducing the hazard of flood, and reducing the size and cost of storm drain lines. 
Federal Flood Insurance Program 
The catastrophic nature of flooding and the relatively localized effect of intermittent floods caused 
the insurance industry to find it financially unfeasible to provide flood insurance at reasonable rates. 
Increasingly, the federal government was requested to act to protect and safeguard private property. 
Legislation was passed in 1956, but money was never appropriated to implement the program. 
Further studies resulted in Title XIII, National Flood Insurance, part of the Housing and Urban 
Development Act of 1968 (Public Law 90-448) and the Flood Disaster Protection Act of 1973. 
Together these acts created an enormous federal subsidy in an effort to provide reasonable flood 
insurance at affordable rates. In effect, the federal government underwrites private insurance 
companies and subsidizes insurance premiums by paying the difference between the "affordable" 
premium which is charged to the policyholder, and the actuarial or "true cost" premium. The 
actuarial premium would be the rate charged to the policy holder if the insurance policy were written 
based on the statistical likelihood of flooding combined with the potential losses resulting from flood 
damage. In exchange for the reduced rate, property owners, through state and local governments, 
agree to adopt appropriate land use control measures to bring the risk of public and private losses to 
acceptable levels. 
In 1979, work was completed on the Flood Insurance Study for the City of Grants Pass. A similar 
study was completed for Josephine County in 1980. Initial use of this information will be to convert 
Grants Pass and Josephine County to the regular flood insurance program of the Federal Insurance 
Administration. Streams in the area requiring detailed study were identified at informal meetings 
held in January 1978, between the U.S. Geological survey, the Federal Insurance Administration and 
the City of Grants Pass. The Rogue River and Gilbert Creek were studied by detailed methods. 
Although the Gilbert Creek flood plain is quite small, the density and intensity of streamside 
development j ustified establishing the flood zones by detailed methods. Most recently, the Federal 
Emergency Management Agency completed a new Flood Insurance Study for Josephine 
County and Incorporated Areas dated December 3, 2009. 
A primary purpose of the National Flood Insurance Program is to encourage state and local 
governments to adopt and enforce land use practices within flood prone areas to the degree necessary 
to reduce the risk to acceptable' levels as set forth in the program. Each Flood Insurance Study 
therefore includes a map which delineates the extent and location of areas subject to periodic 
inundation and differentiates between the floodway and 100-year and the 500-year flood boundaries. 
In order to provide a national standard without regional discrepancies, the 100-year flood has been 
adopted by the Federal Insurance Administration, as the base flood for flood management and 
insurance, purposes. The 500-year flood is indicated simply to make communities aware of 
"- additional areas in the community with perceivable levels of flood risk. Map 5:30.3 illustrates the 
approximate location of the floodway, the 100-year and 500-year flood boundaries. The actual 
areas of special flood hazard are identified by the Federal Emergency Management Agency in 
a scientific and engineering report titled "Flood Insurance Study" with the accompanying 
Flood Insurance Rate Maps for Josephine County and Incorporated areas effective date 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 17 
December 3, 2009, and any revision. 
The principal result of the Flood Insurance Study is the Flood Insurance Rate Map. This map 
contains the official delineation of flood elevation lines. The level of flood risk and therefore 
insurance premiums are determined from this map. 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 18 
MAP 5.30.3 
Floodway and 100-Year Flood Plain for 
Grants Pass Urban Growth Boundary 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 19 
The National Flood Insurance Program divides the area of the 100-year flood into a floodway and 
floodway fringe. The floodway is the actual channel of a stream or river plus any adjacent flood 
plain areas that must be free of encroachment to allow the 100-year flood to flow freely without 
substantial increases in flood heights. Maximum federal standards establish a limit for flood height 
increases of one foot, provided that hazardous velocities are not produced. The area between the 
floodway and the boundary of the 100-year flood are termed the floodway fringe. Exhibit 5.30.4 
depicts the relationship among the stream channel, floodway, floodway fringe and 100-year 
floodplain. 
EXHIBIT 5.30.4 
Floodway-Flood Plain Schematic 
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Insurance rates are based on the degree of flood risk. In order to establish actuarial insurance rates, 
the Federal Insurance Administration has developed a process to transform the data depicted in the 
floodway schematic drawing, into flood insurance criteria. That process includes the determination 
of flood hazard factors and flood insurance zone designations for each flooding river or creek. 
The city has adopted a floodplain development ordinance that is in compliance with the National 
Floo<J Insurance Program. The city ordinance identifies buildable land within the 100-year 
floodplain as the floodway fringe. The floodway is not considered buildable. Development on the 
buildable land (floodway fringe) must be constructed so that the first floor level of the building is a 
minimum of one foot above the 100-year flood elevation. This regulation anticipates that once the 
floodway fringe is fully encroached upon by development, the actual flood elevation will be raised 
one foot above the 100-year flood level. . Development in the floodway must demonstrate that 
encroachment will not raise the flood elevation beyond the one foot maximum above the 100-year 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 20 
flood elevation. The federal regulations require that a qualified surveyor determine the degree of 
displacement. The displacement of floodway water by the proposed floodway development may 
adversely affect other development on the adjacent floodway fringe, which usually precludes 
floodway development in an urban area. 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 21 
City of Grants 
PROPOSED RE 
EXHIBIT ß 
r • ---KM 
Title 9 
Chapters: 
9.01 
9.04 
9.08 
9.12 
9.13 
9.16 
9.21 
9.25 
9.28 
9.36 
9.37 
9.40 
9.44 
9.99 
LAND DEVELOPMENT AND PUBLIC IMPROVEMENTS 
I. GENERAL PROVISIONS 
City Utility Easements (Ord. 5197,2003) (Ord. 5434, §5,2008) 
City Building Code-2000 (Ord. 5012 §2,2000&Ord 5468 §152008) 
Garage Sales and Yard Sales 
Prohibition of Fireworks, UFC Section 78,102 Amended. 
Open Burning Prohibited (Ord. 4982 §1,1999; ord. 5229,2004, Ord. 5379,2006) 
Building Moving (Ord. 4833 §3,1995) 
Sign Standards (Ord. 4952 §2,1998; Ord. 4974 §1,1999, Ord. 5248,2004, 
Ord. 5325. 2005, Ord. 5393 §3. 2007) (Ord. 5434 §5, 2008) 
II. TRAILERS AND TRAILER PARKS 
Ballot Measure 37 Procedures 
Recreational Vehicles (Ord. 5349 §15,2006) 
III. PUBLIC IMPROVEMENTS 
Public Improvements 
Prequalifieation Requirements (Ord.4752 §i, 1992) 
Reimbursement Districts for Public Improvements (om 5439 §2,2008) 
Off-Street Parking Facility Assessment 
IV. MEASURE 7 
Claims Filed Under Ballot Measure 7 (Ord. 5037 §1,2000) 
Title 9: Land Development & Public Improvements 
Title 9 Last Revised 11/042009 
Page 1 of 8 
Sections: 
City of Grants icipal Code 
Cha 
CLAIMS FILED UNDER BALLOT MEASURE 
(Ord. #5037 §1,2000) 
9.99.010 Purpose. 
9.99.020 Definitions. 
9.99.030 Notice of Claim. 
9.99.040 Appraisal. 
9.99.050 Completeness Review of Notice of Claim. 
9.99.060 Procedure to Evaluate Claim. 
9.99.070 Discretion to Defer City Enforcement. (Ord. #5044 §1, 2001) 
9.99.080 Subsequent Claims. 
9.99.090 Errors. 
9.99.100 Rights of Private Attorneys General 
9.99.010 Purpose. The purpose of this chapter is: 
A. To create a process for the evaluation of claims filed under the Ballot 
Measure 7, adopted by the voters in November 2000, as an Amendment to 
Article I, Section 18, of the Oregon Constitution, and 
B. To enable persons with valid claims an adequate and fair opportunity to 
present and resolve them in a timely, efficient, thorough, and consistent 
manner. 
9.99.020 Definitions. 
For the purpose of this Chapter 9.99, the following terms, phrases, words and their 
derivations shall have the meaning given in this section. When not inconsistent with 
the context, words used in the present tense include the future, words in the plural 
number include the singular number and words in the singular number include the 
plural number. Words not defined in Chapter 9.99 shall be given the meaning 
intended in Article 18, Section 1 of the Oregon Constitution, or as those words may 
be subsequently defined by Oregon Revised Statute. If not defined there, the words 
shall be given their common and ordinary meaning. 
A. "Regulation'' means a duly adopted City ordinance as codified in the 
Municipal Code, or any law, rule, ordinance, resolution, goal, or other 
enforceable enactment of the City of Grants Pass. 
Title 9: Land Development & Public Improvements 
Title 9 Last Revised 11/042009 
Page 2 of 8 
City of Grants icipal Code 
B. 
C. 
D. 
"Property Owner" means the owner of title to affected property or the contract 
purchaser of such property, where the contract is of record. 
"Reduction in the Fair Market Value" means the difference in the fair market 
value of the property before and after application of the regulation including 
the net cost to the landowner of an affirmative obligation to protect, provide, 
or preserve wildlife habitat, natural areas, wetlands, ecosystems, scenery, 
open space, historical, archaeological or cultural resources, or low income 
housing. 
"Affected Property" means the private real property claimed to have a 
reduction in the fair market value because of a regulation which was adopted, 
first enforced or applied after the property owner became owner and includes 
contiguous units of property under the same ownership and any structure 
built or sited on the property, aggregate and other removable minerals, and 
any forest product or other crop grown on the property. 
"Exempt Regulation" means; 
5 A regulation which imposes a restriction required under federal law, 
to the minimum extent required by federal law; or 
5 A regulation prohibiting the use of a property for the purpose of 
selling pornography, performing nude dancing, selling alcoholic 
beverages or other controlled substances, or operating a casino or 
gaming parlor; or 
5 A regulation governing historically and commonly recognized 
nuisance laws, including those nuisances described in Title 5 of the 
Grants Pass Municipal Code, as amended from time to time, and the 
criminal laws of the State of Oregon and the City of Grants Pass. 
A claim arising from the Ballot Measure 7 shall not be considered a claim 
unless notice of claim is filed as required by this Section and is signed by all 
owners of fee title (or portions thereof) to the property. 
A notice of claim shall be in writing, filed with the City Manager (with a copy to 
the City Attorney) and shall contain not less than all of the following: 
9.99.030 Notice of Claim. 
Title 9 Last Revised 11/Ü42009 
Title 9: Land Development & Public Improvements Page 3 of 8 
City of Grants icipal Code 
1. 
2. 
3. 
4. 
5. 
6 . 
7. 
8. 
9. 
10. 
11. 
12. 
13. 
The name, address and telephone number of the person filing the 
claim. 
The names and addresses of all property owners and all persons who 
hold a security interest in the affected property. 
A legal description and street address of affected property including 
contiguous units of property under the same ownership. 
Preliminary title report, dated not more than 30 days from the date the 
claim is filed, from a title insurance company licensed in Oregon. 
A description of, and citation to, the regulation adopted, first applied or 
enforced on the affected property causing a reduction in the fair 
market value. 
The date regulation was adopted, applied or enforced on the affected 
property. 
The date property owner or owners obtained title to property or 
became contract purchasers of record. 
A description of the use that has been restricted by the regulation. 
The amount the affected property has suffered a reduction in the fair 
market value because of the regulation. 
Statements explaining why the regulation is not an exempt regulation. 
A written appraisal as set forth in section 9.99.040. 
Any exempt regulations, known to the claimant that may apply to the 
affected property, whether or not those exempt regulations affect the 
fair market value. 
A statement explaining how the regulation restricts the use of the 
affected property and why the regulation has the effect of reducing the 
fair market value of the property upon which the regulation is 
imposed. 
Tille 6 Last Revised 11/042009 
Title 9: Land Development & Public Improvements Page 4 of 8 
City of Grants icipal Code 
14. A statement of the effect a release of the regulation on the property 
would have on the potential development of the property, stating the 
greatest degree of development that would be permitted if the 
identified regulation were released from the property. 
15. If the regulation is a land use regulation, written demonstration that the 
claimant has previously sought an amendment, repeal, or a variance 
to the regulation. 
16. A statement of the relief sought by the claimant. 
C A notice of claim must be accompanied by an application fee of $3,000 to be 
paid in advance of acceptance for filing to cover the costs of a complete 
review of the regulation, an independent appraisal of the property by the City, 
notices to properties which could be affected by a release of the regulation, 
hearings to determine the validity of the claim and routine processing of the 
D. The application fee shall be refunded if the City or an appellate body 
determines that just compensation should be paid based on Ballot Measure 7 
or that based on discretion the regulation should not be currently enforced or 
applied. 
9.99.040 Appraisal. 
A written appraisal shall comply with the following specific requirements: 
A. The appraisal shall be performed by an appraiser certified or licensed under 
ORS Chapter 674 that provides an opinion of the difference in the fair market 
value of the affected property before and after application of the regulation. 
B. The appraisal shall specifically include and address consideration of the 
value of the property if all other properties throughout the community are 
permitted to develop without regulation. 
C. The appraisal shall include a statement that the before value of the property 
was not reduced by any regulations which were passed, adopted, first 
enforced or applied to the property on or before 
December 6, 2000. 
L 
Title 9 Last Revised 11/042009 
Title 9: Land Development & Public Improvements Page 5 of 8 
D. The appraisal must expressly note all existing infrastructure limitations and 
value the property without an assumption that the Infrastructure will be 
Improved at governmental expense or through discretionary governmental 
action. 
E. The appraisal's consideration of the reduction in fair market value shall be 
limited to the difference in the fair market value of the property before and 
after the application of the regulation. 
F. The analysis must include the net cost to the landowner of an affirmative 
obligation to protect, provide, or preserve wildlife habitat; natural areas; 
wetlands; ecosystems; scenery; open space; historical, archeological, or 
cultural resources; or low-income housing, except to the minimum extent that 
a regulation or restriction is necessary to comply with federal law. 
G. The analysis shall not include consideration of any other damage that the 
regulation may have upon the property In question or any other property 
owned by the applicant. 
H. The appraisal must expressly consider the effect of the aforesaid Ballot 
Measure 7 on the availability of other real property including the extent to 
which the supply of such other real property is or will be increased due to the 
repeal or waiver of restrictions following the passage of Measure 7. 
I. The appraisal report must clearly state: (1) the assumptions related to the 
regulation(s) restricting the use(s) of the property; (2) the dates of valuation; 
(3) the assumptions related to uses allowed on the property if the regulation 
had not been enacted, enforced, or applied; (4) any statistical, economic, 
econometric, or other calculations, models, or methods used to determine 
reduction in value; (5) the comparable properties evaluated; and (6) the 
methodology used by the appraiser to determine the reduction in fair market 
value. 
9.99.050 Completeness Review of Notice of Claim. 
A notice of claim shall not be considered a claim until determined to be complete by 
the City Manager. If the notice of claim is not complete, the City Manager shall 
inform the claimant in writing of the additional information necessary to make the 
notice of claim complete. The notice of claim shall be deemed complete at such 
time as the additional information is submitted and determined complete. 
Title 9: Land Development & Public Improvements 
Title 9 Last Revised 11/042009 
Page 6 of 8 
City of Grants icipal Code 
9.99,060 Evaluation of the Claim. 
Claims shall be processed as follows: 
A. Upon the filing of a complete notice of claim, the City Manager shall make a 
recommendation to the City Council as to disposition of the claim and 
schedule the matter for consideration by the Council. 
B. Notice of the time and date of a hearing at which the Council will consider the 
claim shall be mailed to the claimant (and all owners of record of property on 
the most recent property tax assessment roll where such property is located 
within 500 feet of the affected property) not less than 10 days prior to the 
date of consideration. Personal notice to the claimant prior to the 10 days or 
physical presence of the claimant at the hearing shall be equivalent to mailed 
notice. 
C. At a public hearing the Council shall consider the information provided by the 
claimant, information provided by the City staff, and testimony of interested 
persons testifying at the hearing, 
D. The Council shall not consider any appraisal which is not in compliance with 
the specific requirements of Chapter 9.99. 
E. If the Council determines compensation is due under Ballot Measure 7, the 
City shall pay the property owner the amount due or may exercise its 
discretion as set forth in 9.99.070. 
9.99.070 Discretion to Defer City Enforcement. 
A. After consideration by the Council of the notice of claim and in lieu of paying 
compensation to the property owner, the City may choose not to officially 
enforce or apply a regulation except zoning ordinances, the City's 
Comprehensive Plan, or Statewide Planning Goals. The application of said 
discretion shall not waive, limit, reduce, or restrict the right of the City to 
enforce said regulation at some point in the future. The application of said 
discretion shall not be considered a rescission, withdrawal, or repeal of said 
regulation. (0rd.#5044§l ,200i) 
B. Chapter 9.99 [including Section 9.99.070(A)] do not provide and shall not be 
interpreted to provide the City of Grants Pass with any legal authority to 
waive, remove, or fail to enforce or apply zoning ordinances, the City's 
Comprehensive Plan, or Statewide Planning Goals. 
(Ord. #5044 §1,2001) 
Title 9 Last Revised 11/042009 
Title 9: Land Development & Public Improvements Page 7 of 8 
City o f G r a n t s ^ ^ ^ ^ ß n i c i p a l Code 
9.99.080 Subsequent Claims. 
A. If a claim is granted and paid by the City and the claimant does not appeal 
said amount to the Circuit Court within 90 days, or if on reconsideration an 
amount is set by the Circuit Court and paid by the City, the claimant and 
subsequent property owners may not make a subsequent claim for adoption, 
application or enforcement of the same regulation or a regulation which 
affects the same use considered and decided in the original claim. 
B. If a claim is denied and the Claimant does not appeal the denial to the Circuit 
Court within 90 days, the claimant and subsequent property owners may not 
make a subsequent claim for adoption, application or enforcement of the 
same regulation or a regulation which affects the same use considered and 
decided in the original claim. 
9.99.090 Errors. 
A. The failure of the City to follow the procedures noted in Chapter 9.99 shall 
not result in a default release of the regulation, a default granting of the relief 
sought, or a default finding of compensation due. 
B. The failure of the City to provide notice to any persons, except notice to the 
owner of the date of consideration by the Council of the notice of claim, shall 
not affect or invalidate any proceedings conducted by the City under Chapter 
9.99. 
9.99.100 Rights of Private Attorneys General. 
If the City during its consideration of the notice of claim in its discretion chooses to 
defer the enforcement or application of a regulation, persons who are adversely 
affected by the use put to the property by the owner in violation of said regulation 
shall be permitted to initiate and maintain a cause of action against the owner of the 
property for damages in Municipal or Circuit Court. 
Title 9: Land Development & Public Improvements 
Tide 9 Last Revised 11/042009 
Page 8 of 8 
CITY OF GRANTS PASS COMMUNITY DEVELOPMENT DEPARTMENT 
FLOOD HAZARD DISTRICT 
ZONING MAP AMENDMENT, SPECIAL PURPOSE DISTRICT MAP AMENDMENT 
AND DEVELOPMENT CODE TEXT AMENDMENT 
FINDINGS OF FACT - CITY COUNCIL 
Procedure Type: Type IV: Planning Commission Recommendation 
and City Council Decision 
Project Number: 09-40500004 & 09-40500006 
Project Type: Zoning Map Amendment, Special Purpose District Map 
Amendment and Development Code Text Amendment 
Applicant: City of Grants Pass 
Planner Assigned: Lora Glover 
Application Received: July 17, 2009 
Application Complete: July 24, 2009 
n - i - —r. (ti.ic n t. Lfdie ui oiciii r w p u n , rv l i A A nnrtn oepieniue i i^, ¿uuy 
Date of UAPC Hrng: September 23, 2009 
Date UAPC Findings of 
Fact Signed: 
October 14, 2009 
Date of City Council 
Hearing: 
November 4, 2009 
Date City Council 
Findings of Fact Signed: 
November 18, 2009 
I. PROPOSAL: 
The proposal includes the following: 
1) Amend the Special Purpose District Map for the Flood Hazard District by adopting the 
current Flood Insurance Study (FIS) Volumes 1 and 2 and Flood Insurance Rate Maps 
(FIRM) for Josephine County, Oregon and Incorporated areas effective date December 
3, 2009, issued by the Department of Homeland Security's Federal Emergency 
Management Agency (FEMA). 
2) Amend Section 13.200 (Flood Hazard District) of the City of Grants Pass 
Development Code to be consistent with the National Flood Insurance Program (NFIP) 
and Oregon Model Code Provisions. 
3) Update Element 5 of the Comprehensive Plan, specifically the section under Flood 
Hazard (5.30) to reference the new FIS and FIRM effective December 3, 2009. The 
revision is a modification to the narrative of the Comprehensive Plan and the change is 
reviewed as a minor amendment to the database in accordance with Section 13.5.2 of 
the Comprehensive Community Development Plan Policies document. No criteria are 
reviewed with the narrative change. 
09-40500004 & 09-40500006 ~ Flood Hazard District Page 1 of 9 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
City Council - Findings of Fact 
4) The adopting ordinance for City Council adoption repealed any conflicting or duplicate 
provisions contained in the Municipal Code related to flood hazard provisions. 
II. AUTHORITY AND CRITERIA: 
Sections 4.032, 4.042 and 4.102 of the City of Grants Pass Development Code provide 
the procedures for initiation of a Special Purpose District Map Amendment and 
Development Code Text Amendment. The proposed Special Purpose District Map 
Amendment and Development Code Text Amendment were initiated by the Community 
Development Director. 
Sections 2.060, 7.040 and 7.050 authorize the Urban Area Planning Commission to 
make a recommendation to the City Council and authorize the City Council to make a 
final decision on a land use matter requiring a Type IV procedure, in accordance with 
procedures of Section 2.060. 
The applicable criteria from the Development Code to be met include the following: 
• Section 4.033 -Zoning Map Amendment 
• Section 4.044 - Special Purpose District Amendment 
• Section 4.103 - Development Code Text Amendment 
III. APPEAL PROCEDURE: 
The City Council's final decision may be appealed to the State Land Use Board of 
Appeals (LUBA) as provided in state statutes. A notice of intent to appeal must be filed 
with LUBA within twenty-one (21) days of the Council's written decision. 
IV. PROCEDURE: 
A. An application for a Comprehensive Plan Amendment, Flood Hazard 
District Zoning Map Amendment, Special Purpose District Map 
Amendment and Development Code Text Amendment was submitted and 
deemed complete on July 17, 2009. The application processed in 
accordance with Section 2.060 of the Development Code, and Sections III 
and V of the 1998 Intergovernmental Agreement. 
B. Notice of the proposed amendment was mailed to the Oregon 
Department of Land Conservation and Development (DLCD) on July 17, 
2009, in accordance with ORS 197.610 and OAR Chapter 660-Division 
18. 
C. Notice of the proposed amendment was mailed to Josephine County on 
July 17, 2009, in accordance with the 1998 Intergovernmental 
Agreement. 
09-40500004 & 09-40500006 - Flood Hazard District Page 2 of 9 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
City Council - Findings of Fact 
D. Notice of the September 23, 2009, Planning Commission hearing and the 
November 4, 2009, City Council hearing was mailed to potentially 
interested parties on September 3, 2009. 
E. Public notice of the September 23, 2009, Planning Commission hearing, 
and the November 4, 2009, City Council hearing was published in the 
newspaper on September 19, 2009, in accordance with Sections 2.053 
and 2.063 of the Development Code. 
F. A public hearing was held by the Planning Commission on September 23, 
2009, to consider the proposal and make a recommendation to City 
Council. 
G. Public notice of the November 4, 2009, City Council hearing was 
published in the newspaper on October 28, 2009, in accordance with 
Sections 2.053 and 2.063 of the Development Code. 
H. A public hearing was held by the City Council on November 4, 2009, to 
consider the matter. 
V. SUMMARY OF EVIDENCE: 
A. The basic facts and criteria regarding this application are contained in the 
staff report, which is attached as Exhibit "A" and incorporated herein. 
B. The minutes of the November 4, 2009, City Council public hearing are 
attached as Exhibit "B" and incorporated herein. 
C. PowerPoint Presentation given by staff at the November 4, 2009, public 
hearing is attached as Exhibit "C" and incorporated herein. 
D. Letter of concern received from Sandra Loghry, dated 11/03/09, attached 
to the City Council Staff Report as Exhibit 3. 
E. Letter of concern received from Nadine Ham, dated 11/04/09, attached to 
the City Council Staff Report as Exhibit 4. 
VI. FINDINGS: 
The City Council found that the request meets the criteria contained in Section 13.5.2 of 
the Comprehensive Community Development Plan Policies and the criteria contained in 
Sections 4.033, 4.044 & 4.103 of the Development Code based on the reasons stated in 
the findings below. 
09-40500004 & 09-40500006 ~ Flood Hazard District Page 3 of 9 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
City Council - Findings of Fact 
VIL GENERAL FINDINGS OF FACT - BACKGROUND AND DISCUSSION: 
The City of Grants Pass participates in the National Flood Insurance Program (NFIP). 
By having ordinances that comply with the NFIP, residents are eligible to obtain flood 
insurance through the program. 
FEMA has recently completed the process of updating the Flood Insurance Study (FIS) 
and Flood Insurance Rate Maps (FIRMs) throughout the country and state, including 
Josephine County. Both the City of Grants Pass and Josephine County will be adopting 
the complete FIS and all of the FIRM maps covering Josephine County and the 
incorporated areas. By doing so, there will not be a need to undertake an additional 
amendment in the event the Urban Growth Boundary is adjusted in the future. 
The purpose of the new FIS is to revise and update information on the existence and 
severity of flood hazards in the geographic area of Josephine County, to include the 
Cities of Cave Junction and Grants Pass. The original hydrologic and hydraulic 
analyses were performed by the U.S. Geological Survey (USGS), and completed in 
1979. The countywide updated was performed by WEST Consultants, Inc., and was 
completed in October 2008. 
On June 3, 2009, FEMA mailed their "Letter of Final Determination" instructing the City 
that the new study and maps must be adopted by December 3, 2009, to maintain its 
participation in the flood insurance program. The FIS and FIRM maps currently in effect 
are dated September 27, 1991. The floodway boundary and floodway maps have been 
incorporated into the new FIRM maps. The existing FIS and FIRM maps will be 
maintained for historical reference. 
Failure to adopt the study and maps by December 3 means the City would be 
suspended from the flood insurance program effective on that date, leaving citizens at 
risk of flood damage that would not be covered by the National Flood Insurance 
Program. 
Adoption of the new FIS and FIRM maps requires that Element 5 of the Comprehensive 
Plan, specifically the section under Flood Hazard (5.30) be amended to reference the 
new FIS and FIRM effective December 3, 2009. The revision is a modification to the 
narrative of the Comprehensive Plan and the change is reviewed as a minor amendment 
to the database in accordance with Section 13.5.2 of the Comprehensive Community 
Development Plan Policies document. No criteria are reviewed with the narrative 
change. 
In addition to adopting the new FIS and FIRMs, FEMA's "Letter of Final Determination" 
states additional requirements must be met under Section 1361 of the National Flood 
Insurance Act of 1968, as amended, within six (6) months of the date of their letter. 
Specifically, the standards of Paragraph 60.3(d) of the NFIP regulations must be met. 
The letter goes on to list the following actions in order to be in compliance: 
• Amend existing regulations to incorporate any additional requirements of 
Paragraph 60.3(d); 
• Adopt all standards of Paragraph 60.3(d) into one new, comprehensive 
set of regulations; or 
09-40500004 & 09-40500006 ~ Flood Hazard District Page 4 of 9 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
City Council - Findings of Fact 
• Show evidence that regulations have previously been adopted that meet 
or exceed the minimum requirements. 
The "Letter of Final Determination" included a "Summary of Map Actions" documenting 
previous "Letter of Map Change (LOMC) actions (including Letters of Map Amendment 
and Letters of Map Revision) which will be superseded by the revised FIRM panels. 
Many property owners will find little change in the flood information for their property, 
while others will be required to meet the new elevation requirements for all new 
structures and substantial improvements to existing structures. 
An example of the existing and amended maps are provided in the City Council Staff 
Report. 
The summary notes one LOMC for 643/645 SW Balsam Drive, Grants Pass, Oregon, 
which will be superseded by new detailed flood hazard information based upon revised 
hydrologic and hydraulic analyses. The property owners were mailed a separate notice 
concerning the revised FIRMs, but they have not responded as of the date of this report. 
The existing regulations in Article 13 of the Development Code have been reviewed 
against Paragraph 60.3 (d) and the State's Model Flood Plain Ordinance for consistency. 
The additions and changes to Section 13.200 are reflective of the regulations from the 
above documents. 
The Municipal Code also includes flood hazard regulations. All flood hazard provisions 
have been incorporated into Section 13.200 of the Development Code. The final 
ordinance for approval by the City Council will repeal any old ordinances and existing 
language that has been incorporated into the Development Code. 
VIII. FINDINGS OF FACT ~ CONFORMANCE WITH APPLICABLE CRITERIA ~ 
SECTION 4.033 OF THE DEVELOPMENT CODE 
Criteria for Amendment The Zoning Map may be amended by the review bodies 
provided that all the following criteria are met: 
(1) The proposed use, if any, is consistent with the proposed Zoning District. 
(2) The proposed Zoning District is consistent with the Comprehensive Plan 
Land Use Map designation. 
(3) A demonstration that existing or proposed levels of basic urban services 
can accommodate the proposed or potential development without 
adverse impact upon the affected service area or without a change to 
adopted utility plans. 
(4) A demonstration that the proposed amendment is consistent with the 
functions, capacities and performance standards of transportation 
facilities identified in the Master Transportation Plan. 
09-40500004 & 09-40500006 ~ Flood Hazard District Page 5 of 9 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
City Council - Findings of Fact 
(5) The natural features of the site are conducive to the proposed Zoning 
District. 
(6) The proposed zone is consistent with the requirements of all overlay 
Districts that include the subject property. 
(7) The timing of the zone change request is appropriate in terms of the 
efficient provision or upgrading of basic urban services versus the 
utilization of other buildable lands in similar zoning districts already 
provided with basic urban services. 
(8) In the case of rezoning from the Urban Reserve District, that the criteria 
for conversion are met, as provided in Section 4.034. 
City Council Response: Not Applicable. Although the proposed amendments 
do not related to zoning, it was found that review and acknowledgement of the 
criteria was important. The adoption of the new FIS and FIRM will result in a 
map change to the flood hazard, one of the special purpose districts regulated by 
the City of Grants Pass. The amendment affects properties along the Rogue 
River and Gilbert Creek. However, the above listed criteria are found not 
applicable to the amendment. 
IX. FINDINGS OF FACT ~ CONFORMANCE WITH APPLICABLE CRITERIA -
SECTION 4.044 OF THE DEVELOPMENT CODE 
(1) The Flood Hazard District map is the Flood Boundary - Floodway Map 
established by the Federal Emergency Management Agency (FEMA) in 
the scientific and engineering reports entitled "The Flood Insurance Study 
for the City of Grants Pass" and the "The Flood Insurance Study for the 
County of Josephine County, State of Oregon". The flood hazard district 
map may be amended only by FEMA in the procedure provided for Flood 
Boundaries - Floodway Maps. 
(2) Upon receipt of proper authorization from FEMA, the Director shall begin 
administering the revised Flood Hazard District, as designated by FEMA. 
City Council Response: Satisfied. As noted above, on June 3, 2009, FEMA 
mailed their "Letter of Final Determination" instructing the City that the new FIS 
and FIRM maps must be adopted by December 3, 2009, to maintain its 
participation in the flood insurance program. Upon adoption, the updated FIS, 
FIRM and Section 13.200 of the Development Code, will be used to regulate 
properties in the flood hazard area. 
09-40500004 & 09-40500006 ~ FIoodHazard District Page 6 of 9 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
City Council - Findings of Fact 
X. FINDINGS OF FACT - CONFORMANCE WITH APPLICABLE CRITERIA ~ 
SECTION 4.103 OF THE DEVELOPMENT CODE 
The text of the Development Code may be recommended for amendment and 
amended provided that all of the following criteria of Section 4.103 of the 
Development Code are met 
CRITERION 1: The proposed amendment is consistent with the purpose of the 
subject section and article. 
City Council Response: Satisfied. The proposal amends Section 13.200 
"Flood Hazard District". The purpose statement of Section 13.210 states that the 
intent of the Flood Hazard District is to designate areas that may be hazardous to 
development due to flooding. The District is to provide standards that specify 
how development will minimize public and private losses due to flood conditions 
in specific areas by provisions designed to: 
• Protect human life and health; 
• Minimize expenditure of public money; 
• Minimize need for rescue and relief efforts; 
• Minimize prolonged business interruptions; 
• Minimize damage to public facilities; 
• Help maintain a stable tax base; 
• Notify potential buyers of special flood hazard; and 
• Ensure those who occupy flood hazard areas accept responsibility 
for their actions. 
The proposed amendment is consistent with the purpose statement of Section 
13.210 because it brings the Development Code into compliance with regulations 
of the National Flood Insurance Program (NFIP, Paragraph 60.3(d)) as required 
under Section 1361 of the National Flood Insurance Act of 1968, as amended. 
Specifically, the proposed text amendment will: 
• Consolidate various flood ordinances currently located within the 
Municipal Code, into one location in the Development Code; 
• Provide additional terms and definitions for the flood hazard 
district; and 
• Brings construction standards for crawlspaces and below-grade 
crawlspaces into compliance. 
CRITERION 2: The proposed amendment is consistent with other provisions of 
this code. 
City Council Response: Satisfied. As noted under Section 13.010 of the 
Development Code, special purpose districts, to include the Flood Hazard 
District, provide standards intended to mitigate natural hazards, to protect natural 
features and to mitigate land use conflicts. The standards applicable for the 
Flood Hazard District are in addition to the standards of the underlying zoning 
09-40500004 & 09-40500006 ~ Flood Hazard District Page 7 of 9 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
City Council - Findings of Fact 
district. Therefore, the proposed amendment is internally consistent with other 
provisions of the Development Code. 
CRITERION 3: The proposed amendment is consistent with the goals and 
policies of the Comprehensive Plan, and most effectively carries out those goals 
and policies of all alternatives considered. 
City Council Response: Satisfied. The proposed amendment is consistent 
with the goals and policies of the Comprehensive Plan. Section 5.2 of Element 5 
of the Comprehensive Plan Policy document states that the Development Code 
shall: 
« Regulate development within the 100-year floodplain and 
floodway as required to maintain participation in the National 
Flood Insurance Program; 
• Provide methods to determine and appeal the location of the 100-
year floodplain and floodway boundaries when there appears to 
be discrepancies between official mapped boundaries and actual 
field conditions. 
• Facilitate flood hazard policies. 
The proposed changes to Section 13.200 of the Development Code and the 
narrative of the Comprehensive Plan help implement the policy statements. As 
noted above, the narrative of Element 5 of the Comprehensive Plan (Section 
5.30 ~ Flood Hazard) is being modified to reference the new FIS and FIRM 
effective December 3, 2009. The alternative of not adopting the new FIS, FIRM 
and Code sections is not a viable option as it would cause suspension with the 
City's participation in the NFIP. 
CRITERION 4: The proposed amendment is consistent with the functions, 
capacities, and performance standards of transportation facilities identified in the 
Master Transportation Plan. 
City Council Response: Not Applicable. The proposed amendments do not 
pertain to the performance standards of the Master Transportation Plan. 
XI. DECISION: 
A. The City Council APPROVED the amendment of the Special Purpose 
District Map for the Flood Hazard District by adopting the current Flood 
Insurance Study (FIS) Volumes 1 and 2 and Flood Insurance Rate Maps 
(FIRM) for Josephine County, Oregon and Incorporated areas effective 
date December 3, 2009, issued by the Department of Homeland 
Security's Federal Emergency Management Agency (FEMA). 
B. The City Council APPROVED the proposed amendment to Section 
13.200 (Flood Hazard District) of the City of Grants Pass Development 
Code to be consistent with the National Flood Insurance Program (NFIP) 
and Oregon Model Code Provisions. 
09-40500004 & 09-40500006 - Flood Hazard District Page 8 of 9 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
City Council-Findings of Fact 
C. The City Council APPROVED the amendment to update Element 5 of the 
Comprehensive Plan, specifically the section under Flood Hazard (5.30) 
to reference the new FIS and FIRM effective December 3, 2009. 
D. The City Council APPROVED the adoption of the ordinance repealing 
Sections 9.50-9.56 (Flood Hazard Regulations), Title 9: Land 
Development and Public Improvements of the Municipal Code. 
The vote was 8-0-0, with Councilors Webber, Renfro, Boston, Hitchcock, 
Cummings, Michelon, Wheatley and Gatlin voting in favor of the request. 
XII. APPROVED BY THE CITY COUNCIL this 18th day of November, 2009. 
09-40500004 & 09-40500006 - Flood Hazard District 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
City Council - Findings of Fact 
Page 9 o f9 
City Council Meeting 
November 4, 2009 
6:00 PM 
City Council Chambers 
The Council of the City of Grants Pass met in regular session on the above date with Mayor 
Murphy presiding. The following Councilors were present: Cummings, Wheatley, Renfro, Boston, 
Hitchcock, Gatlin, Michelon, and Webber. Absent: None. Also present and representing the City were 
Interim City Manager Samson, Interim City Attorney Bartholomew, Finance Director Reeves, Deputy 
Chief Landis, Interim Community Director Angeli Paladino, Parks and Community Services Director 
Seybold, Human Resource Coordinator Lange, and sitting in for Public Works was Tim Wilson. 
The Invocation was given by Councilor Gatlin, followed by the Pledge of Allegiance. 
PROCLAMATIONS: None 
1. PUBLIC HEARING: 
a. Ordinance amending Elements -Natural Hazards/Flood Hazard (5.30) of the 
Comprehensive Plan: the Special Purpose District Map for the Flood Hazard District; Section 
13.200 (Flood Hazard District) of the Development Code: and repealing Section 9.50-9.56 (Flood 
Hazard Regulations), TitJe 9: Land Development and Public Improvements of the Municipal Code. 
Mayor Murphy stated, this is a legislative hearing and we will begin the hearing with a Staff report 
followed by a presentation by the applicant, statements from persons in favor of the applicant, statements 
by persons in opposition to the application, and an opportunity for additional comments by the applicant 
and staff. Once that has occurred, the public comment portion will be closed and the matter will be 
discussed and acted upon by the Council. Mayor Murphy asked if there was anyone present who wished 
to challenge the authority of the Council to hear this matter. Seeing none, Mayor Murphy asked if there 
were any Council members who wished to abstain from participating in the hearing or declare a conflict, 
or a potential conflict of interest. Seeing none, he asked if there were any Council members who wished 
to disclose discussions, contacts, or other ex parte information they received prior to the meeting 
regarding the application. 
Seeing none, Mayor Murphy stated, in this hearing the decision of the Council will be based upon 
specific criteria which are set forth in the Development Code, all testimony given which apply in this case 
are noted in the Staff Report. If anyone would like a copy of the Staff Report, please write that in a note 
to me and one will be provided to you. It is Important to remember that if you fail to raise an issue with 
enough detail to afford the Council and the parties an opportunity to respond to the issue, you will not be 
able to appeal to the Land Use Board of Appeals (LUBA) based on that issue. Mayor Murphy stated, the 
hearing will now proceed with a report from staff. 
. 1 
City Council Meeting 
November4, 2009 EXHIBIT 
lb CJL P O P 
Associate Planner Glover stated, tonight before you is an ordinance. We are recommending adoption that 
will provide various amendments to the Development Code and to the Comprehensive Plan, and also 
repeal a section from the Municipal Code all relating to the new flood studies, new flood maps that have 
been prepared by FEMA. Before I get started tonight I want to make a correction in your packet just to 
make sure that it is clear that the ordinance has a number of items referencing Exhibit A on page 5, and 
they are listed out and they are in the same attachment order as in your Staff report but, inadvertently, the 
next page 6 which is actually the beginning of the Staff report is stamped as Exhibit a. The Staff report will 
not be part of the ordinance, just the exhibits to it. It's just as some housecleaning, I wanted to mention 
that. As we go through the process tonight as we are discussing this, we did receive two letters of 
concern and/or objection. They are on the dais before you, and are Exhibit 3 and 4 of the Staff report. The 
first one is concerned about the financial impact for them, if they are required to have to do flood 
insurance. Right now the existing flood map shows their home is outside of the flood hazard and the new 
maps will show that they are inside the flood hazard. Their lender may require that they obtain flood 
insurance. The second letter, is from a Mrs. Hamm. She has property on Portola. The new flood maps 
reflect that the majority of her property is in the floodway, which will put some restrictions on her property. 
She had desires to partition that in a future. She if she goes to partition it in the future, she would have to 
come in with a flood analysis, a no-rise analysis, as part of the land division process, where under the 
current map she would not have to. There will be some additional upfront expenses if she proceeds to go 
with a partition with that property in the future. I'm not sure she wants to discuss this with you tonight but 
she is here if you have questions. 
So again, tonight our proposal includes an ordinance adopting the following items: Amend the 
special purpose district map for the flood hazard district; adopt current flood insurance study's, FIS 
volumes 1 and 2, and the Flood Insurance Rate Maps for Josephine County and the incorporated areas 
of the County; amend section 13.200, the Flood Hazard District of the Development Code; update 
element 5 of the Comprehensive Plan, and then; repeal sections 9.50 through 9.56 of the Flood Hazard 
regulations of the Municipal Code. The importance of this is that we had various discussions throughout 
our Codes, our guidelines, and so now we are consolidating them into one location into the Development 
Code. 
The City Of Grants Pass participates in the National Flood Insurance Program (NFIP) and, by 
doing so, our residents are eligible to obtain flood insurance from the program. The Federal Emergency 
Management Agency, which is referred to as FEMA, has recently completed a process of updating the 
existing maps, the 1991 flood study and the FIRM maps. The purpose of the new flood study is to revise 
and update the information on the existence and severity of flood hazards in Josephine County to include 
the incorporated areas of Cave Junction and Grants Pass. On June 3, 2009, FEMA mailed their letter of 
final determination instructing the City that the maps and the study must be adopted to maintain 
participation in the flood insurance program. The study and the maps are to be adopted no later than 
December 3, the effective date of the new maps. Adoption of the new study and maps requires that 
2 
City Council Meeting 
November 4, 2009 
Element 5 of the Comprehensive Plan be updated to reference those new maps. Currently the 1991 
maps are referenced. In addition, the new study also requires that we update the Development Code, 
specifically the standards from paragraph 60.3(d) as the National Insurance Program regulations must be 
met. We had some construction standards that need to be upgraded through that. (She shows an 
example of the new flood maps and existing flood maps.) The existing map shows the hazards in the blue 
area. This is off of Lincoln and Webster Road. The new maps are colored in the yeííow highlight and it 
shows larger areas that are outside of the flood hazard now where before we were reflecting them inside 
the hazard. I can't go through and highlight every map that we have tonight but we do encourage citizens 
to come into the office if they have specific concerns. We've been fielding quite a few phone calls and 
inquiries at that level on a property-by-property basis. 
The NFIP has been in existence since the passage of the National Flood Insurance Act of 1968. 
There are over 700 communities in the Pacific Northwest alone participating in the program. In 1973, 
flood insurance became mandatory as a condition of any federal or federally related assistant's. FEMA 
conducts hydrologic and hydraulic analysis and prepares the flood plain maps provided to participating 
communities. The recent study was outsourced to West Inc., I believe was the name of the company that 
did that and completed their study last fall in 2008. The new updated maps combine the federal insurance 
rate maps and the federal insurance study reports for Josephine County and the incorporated 
communities as we mentioned. We have a countywide format now with the same flood zone references. If 
you are familiar with the flood zones, we had a zone "a" which had a series of numbered flood zones and 
now those are incorporated under zone "ae" or zone "b", which was traditionally referred to as the 500 
year floodplain is now zoned "x" with a shaded and a unshaded portion. I'm sorry, zone "b" was referred 
to as a floodway fringe. The 100 year flood way in zone "c" was the 500 year flood way. So now we have 
just the single shaded or unshaded zone "x". I think it will be a little bitsimplerfor the insurance 
companies when they are calling into see which zones their properties are in. 
The combination of insurance and mitigation through floodplain management provides a powerful 
combination to help safeguard our residents. The floodplain management, the ordinances and 
development standards is a mitigation device because insurance along cannot adequately protect homes 
and properties. Participation has benefits and consequences. Participation brings a number of benefits to 
the community. Our residents are able to purchase and renew flood insurance policies. The City of Grants 
Pass participates in a community rating system. It's a voluntary rating system that helps qualify residents 
for lower flood insurance premiums as a result of education, outreach, and measures to reduce flood 
losses. In addition the NFIP insurance provides an additional $30,000 from FEMA for 
construction to meet current standards. FEMA also has a very good, easy to use website. People can go 
on to that and literally type in their address and find out if they are at risk or not, and what level of risk 
they are. It also has lists of insurance agents in the area that help them get their insurance coverage. 
Consequences if we don't update our maps in our study programs - if we are suspended from 
the program, we face the following consequences: Existing policies will not be renewed, no federal grants 
3 
City Council Meeting 
November 4, 2009 
or loans for buildings may be made in identified flood hazard areas. Federally backed mortgages such as 
Fannie Mae and Freddie Mac require NFIP insurance, which would make it difficult for a property owner 
to sell their property to people that need to secure loans on them. No federal disaster assistance will be 
provided to repair buildings in identified flood hazard areas. There is a 30 day waiting period for flood 
insurance to become effective. If we were to lapse and didn't enact the new ordinance in time, we would 
have a 30 day waiting period before we would be able to renew our status. Of course, going now into 
December, January or February that's in our traditional flood season. Non-FIP insurance companies will 
not cover more than one claim where NFIP will. The non-FIP providers are hard to find and are 
expensive. As an example, in the information provided, Lloyd's of London is one example. They are very 
expensive and have a high risk pool. 
We were able to obtain, courtesy of Josephine County, some of the photographs that they had 
from the 1964 flood. This is the Webster and Lower River Road area which was the vicinity of the first 
example maps that I showed you. This is a picture of E. Park Street. You can see the bridge crossing 6th 
and 7th Street down there, and M Street along the north side of the picture. This is the Portola 
neighborhood. You can see quite a few homes down here off of Rogue Drive that are in the hazard area. 
Some of them had at least 6 feet of water in them. 
Conformance with applicable criteria - Section 4.033 of the Development Code for zoning map 
amendment is not applicable at this point as the proposed amendments do not relate to a specific zone. 
However, the adoption of the new flood study and the FIRM maps will result in a map change to the flood 
hazard, a special purpose district. The amendments affect properties along the Rogue River and Gilbert 
Creek. Section 4.044 of the Development Code: Our flood hazard district map. The flood boundary 
floodway is established by FEMA. The flood hazard map may be amended only by FEMA, and upon 
receipt of proper authorization from FEMA, the Director shall begin administering the revised flood hazard 
district as designated by FEMA. The criteria are satisfied. On June 3, as we mentioned, FEMA mailed 
their final letter of determination instructing the city to adopt the FIRM study and the FIRM maps. Section 
4.103 of the Development Code - the proposed amendment is consistent with the purpose of the 
subsection and article. This is satisfied as the proposal amends section 13.200 of the flood hazard district 
and is consistent with the purpose statement. The amendment will consolidate various flood ordinances 
located in the Municipal Code and the Development Code. It will provide additional terms and definitions 
for the flood hazard and bring construction standards for crawlspaces and below grade crawlspaces into 
compliance. 
The Planning Commission recommends that the City Council approve the amendments for the 
special-purpose district map, that the Council approve the amendments to section 13.200 of the flood 
district, and the Council approve the amendment to update Element 5 of the Comprehensive Plan. As we 
mentioned, includes provisions to repeal pertinent sections of the Municipal Code. At this point, if you 
have any questions for me, I will field those for you. 
City Council Meeting 
November 4, 2009 
4 
Councilor Cummings asked, is there any difference in the development standards of 100 year flood area 
and the 500 year flood plain? 
Associate Planner Glover stated, the 100 year flood area has to provide the base elevation to make sure 
the bottom floor is 1 foot above that base elevation. That is not required in the 500 year or the zone, I 
think it's the zone "x", unshaded. 
Councilor Cummings asked, what happens with the 500 year fringe when it's all blended together as one 
zone? Do they have to live with that? 
Associate Planner Glover stated, let me go back to the map and I'll show you. We have the traditional 
floodway, which is the "ae" zone now and then zone "x" is everything outside of that. And then the 
shaded, so it's kind of confusing, it's what's referred to as the 100 year, and that is the one foot elevation. 
So, everything else in the white is still zone "x". They have kind of thrown it all into one category. Only in 
the shaded areas then, would you have to meet that 1 foot elevation. 
Councilor Cummings asked, so, most of the properties in that shaded area would have a flood 
certification so that you could verify it. 
Associate Planner Glover stated, yes, they are within this yellow area where we go back to the other side 
in the blue, and all of those would've required... and then outside into the white area they do not. 
Councilor Webber stated, I just want to confirm that there are no retroactive conditions in this proposed 
change from FEMA in terms of any existing structures or properties... structures on properties that are in 
the new designated flood zones. There is nothing that requires them to upgrade, or update, or retrofit? 
Associate Planner Glover stated, that would come if they decide to remodel or rebuild, they would have to 
meet today's code requirements. An example, my folks' property was built to code but the flood is up 
higher than what we had from older map, so if they go to do anything today then they will have to elevate 
probably even more so than they originally had to because the flood is showing to be at a higher level. 
That's based on the better mapping programs that we've had with the elevations and topography maps. 
Councilor Webber asked, right, but this change in designation wouldn't require them to go back and make 
changes to maintain their insurance? 
Associate Planner Glover stated, no, but it gives them the opportunity now if they want to purchase their 
flood insurance now, or if they did have a loan on the house, they would be required to get flood 
5 
City Council Meeting 
November 4, 2009 
insurance today, we If, December 3, where today they wouldn't be. 
Mayor Murphy asked if there were any further questions for staff. Seeing none, he opened it for public 
comment. Seeing none, he closed public comment and returned it to the Council. 
Councilor Renfro stated, I should have asked this while you were still up there Associate Planner Glover 
but do you know if there are any programs available for low or fixed income people that are going to be 
required to have insurance... to help them on the insurance? 
Associate Planner Glover stated, no, that is a discussion that Senior Planner Tom Schauer and I had just 
briefly this evening before we started that we hadn't thought to look into that, and it would be worthwhile 
for us to do, so I will put that on my list to see if we can find some information and direct people a certain 
way. I'm assuming at this point their insurance provider might be able to do that for them, but it would be 
nice to have that information available at the office. 
Councilor Boston stated, well, that answers part of what I was thinking about. I'm not sure whether we 
have the Staff resources, but I would be grateful if people like these letter writers and others could get 
help from your office... one, to understand why their status is changed and perhaps have guidance of how 
they might appeal it. Is there any appeal process? Answer that and then I want to follow up. 
Associate Planner Glover stated, there are two approaches in a sense. If you're talking about appealing 
your decision, that would be through the Land Use Board of Appeals, through Salem, but for individual 
properties? 
Councilor Boston interrupted, individual properties going back to FEMA saying, 'We think you did this.,.". 
Associate Planner Glover stated, interrupted, they would go through a process referred to as a map 
amendment. Their surveyor would provide elevation information to show that they are above that hazard 
area, and we can do that. There was a reference in the report about some of those previous map 
amendments being incorporated into the new study or not, so there are approaches to do that with FEMA. 
Councilor Boston continued, and you could help guide people into how to do that process, I gather. That, 
plus exploring and having available information on folks that have a particular hardship and see if there 
are any sources to mitigate, I think we essentially have to do this. I think it is an overall good thing that 
there are individuals that are obviously going to find it very difficult, and if we can help them work that 
through, I would be very pleased. 
City Council Meeting 
November 4, 2009 
6 
Councilor Webber stated, I just want to put into the record that we have received these letters and i 
certainly understand the concerns, and especially from the elderly couple on a fixed income and 
concerned about how this affects them, but recognizing that my concern or compassion for them doesn't 
override the power of the Federal government and this report is going to come either way. I certainly have 
sympathies for them, but believe this is something we need to do for the good of the community. I would 
move for the first reading of the ordinance. 
Councilor Renfro seconded the motion. 
Mayor Murphy called for further discussion. Seeing none, he called for a vote. 
ORDINANCE NO. 5498 
Councilor Webber moves that the Council adopt the ordinance by the first reading. The motion 
seconded by Councilor Renfro. The vote resulted as follows: "AYES": Wheatlev, Renfro, Boston, 
Hitchcock, Cummings, Webber, Gatlin, and Michelon. "NAYS": None. Abstain: None. Absent: 
None. The ordinance is read. 
Councilor Cummings moves that the ordinance be read by title only, second reading. The motion 
seconded by Councilor Wheatley. The vote resulted as follows: "AYES": Wheatley, Renfro, 
Boston, Hitchcock, Cummings, Webber, Gatlin, and Michelon. "NAYS": None. Abstain: None. 
Absent: None. The ordinance is read. 
May or Murphy stated, for about 20 years, at this point we just called for a vote but it has been pointed out 
to me that we probably should have a motion before we do that, so starting tonight we are doing this 
slightly differently. 1 need a motion to adopt the ordinance. 
Councilor Cummings stated, I will make a motion that we adopt the ordinance. Councilor Renfro 
seconded the motion and Mayor Murphy called for a vote. 
Mayor Murphy asks if the ordinance should be adopted, signified by roll call vote as follows: 
Councilor Michelon - yes; Councilor Wheatley- yes; Councilor Cummings- yes; Councilor Webber-
yes; Councilor Boston- yes; Councilor Hitchcock- yes; Councilor Gatlin- yes; Councilor Renfro-
yes. 
Mayor Murphy declares Ordinance Number 5498 is adopted. 
b. Ordinance f11 amending the Development Code and Comprehensive Plan to revise 
provisions governing jhe Urban Area Planning Commission. (2) amending the Development Code 
to revise the timeframBlfrcissuance of a Director's interpretation, and (3) repealing Ordinance 
4399 and Resolution 4126. ~ 
Mayor Murphy stated, we have already given notice for a lanfriisejTearing. Does anybody have any 
abstentions or conflict of interest they want to declare on that? Seeing noile>grewe okay with just doing 
that much? [He was advised that it was all right, off microphone.] 
! 7 
City Council Meeting 
November 4, 2009 
6. EXECUTIVE SESSION 192.660 (2)(h): To consult with counsel concerning the legal rights and 
duties oTsa public body with regard to current litigation or litigation likely to be filed. 
MOTION 
It was moved by Cotmcilor Ren fro and seconded by Councilor Gatlin to go into executive 
session. The vote resulted asfollows: Renfro, Cummings, Michelon, Wheatley, Hitchcock, Gatlin, 
Boston and Webber. "NAYS": Nhne. Abstain: None. Absent: None. The motion has passed. 
Interim City Attorney Bartholomew statecvthe Council will now meet in executive session for the purpose 
of discussing those subjects previously noticefckfar this session. This executive session is held pursuant to 
ORS 192.660, and more specifically, under the sebtjons of that statute which had been publically noticed 
for this meeting. Representatives of the news media ar^ d designated Staff are allowed to attend the 
executive session. All other members of the audience arenasked to leave the room. Representatives of 
the news media are specifically directed not to report on any oi^he deliberations during the executive 
session, except to state the general subject of the session as previously announced. No decision making 
will be made in executive session. At the end of executive session, we^will return to open session and 
welcome the audience back into the room. 
MOTION 
It was moved by Councilor Gatlin and seconded by Councilor Renfro to^go out of 
executive session. The vote resulted as follows: Renfro, Cummings, Michelon, Wt^ eatley, 
Hitchcock, Gatlin, Boston and Webber. "NAYS": None. Abstain: None. Absent: Nbue. The 
motion has passed. 
7. ADJOURN: 
There being no further business to come before the Council, Mayor Murphy adjourned the 
meeting at 8:30 p.m 
The ordinances, resolutions, and motions contained herein and the accompanying votes have been 
verified by: 
Finance Director 
These minutes were prepared by contracted minute taker, Wendy Hain. 
City Council Meeting 
November 4, 2009 
35 
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CITY OF GRANTS PASS COMMUNITY DEVELOPMENT DEPARTMENT 
FLOOD HAZARD DISTRICT 
ZONING MAP AMENDMENT, SPECIAL PURPOSE DISTRICT MAP AMENDMENT 
AND DEVELOPMENT CODE TEXT AMENDMENT 
STAFF REPORT - CITY COUNCIL 
Procedure Type: Type IV: Planning Commission Recommendation 
and City Council Decision 
Project Number: 09-40500004 & 09-40500006 
Project Type: Zoning Map Amendment, Special Purpose District Map 
Amendment and Development Code Text Amendment 
Applicant: City of Grants Pass 
Planner Assigned: Lora Glover 
Application Received: July 17, 2009 
Application Complete: July 24, 2009 
Date of Staff Report: September 14, 2009 
Date of UAPC Hrng: September 23, 2009 
Date UAPC Findings of 
Fact Signed: 
October 14, 2009 
Date of City Council 
Hearing: 
November 4, 2009 
I. PROPOSAL: 
The proposal includes the following: 
1) Amend the Special Purpose District Map for.the Flood Hazard District by adopting the 
current Flood Insurance Study (FIS) Volumes 1 and 2 and Flood Insurance Rate Maps 
(FIRM) for Josephine County, Oregon and Incorporated areas effective date December 
3, 2009, issued by the Department of Homeland Security's Federal Emergency 
Management Agency (FEMA). 
2) Amend Section 13.200 (Flood Hazard District) of the City of Grants Pass 
Development Code to be consistent with the National Flood Insurance Program (NFIP) 
and Oregon Model Code Provisions. 
3) Update Element 5 of the Comprehensive Plan, specifically the section under Flood 
Hazard (5.3Ó) to reference the new FIS and FIRM effective December 3, 2009. The 
revision is a modification to the narrative of the Comprehensive Plan and the change is 
reviewed as a minor amendment to the database in accordance with Section 13.5.2 of 
the Comprehensive Community Development Plan Policies document. No criteria are 
reviewed with the narrative change. 
09-40500004 & 09-40500006 ~ Flood Hazard District 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
City Council - Staff Report 
Page 1 o f 4 
75 W 
4) The adopting ordinance for City Council adoption will repeal any conflicting or 
duplicate provisions contained in the Municipal Code related to flood hazard provisions. 
II. AUTHORITY AND CRITERIA: 
Sections 4.032, 4.042 and 4.102 of the City of Grants Pass Development Code provide 
the procedures for initiation of a Special Purpose District Map Amendment and 
Development Code Text Amendment. The proposed Special Purpose District Map 
Amendment and Development Code Text Amendment were initiated by the Community 
Development Director. 
Sections 2.060, 7.040 and 7.050 authorize the Urban Area Planning Commission to 
make a recommendation to the City Council and authorize the City Council to make a 
final decision on a land use matter requiring a Type IV procedure, in accordance with 
procedures of Section 2.060. 
The applicable criteria from the Development Code to be met include the following: 
• Section 4.033 -Zoning Map Amendment 
Section 4.044 — Special Purpose District Amendment 
• Section 4.103 - Development Code Text Amendment 
III. APPEAL PROCEDURE: 
The City Council's final decision may be appealed to the State Land Use Board of 
Appeals (LUBA) as provided in state statutes. A notice of intent to appeal must be filed 
with LUBA within twentyrone (21) days of the Council's written decision. 
IV. BACKGROUND AND DISCUSSION: 
Detailed background and discussion are provided in the Planning Commission's 
Findings of Fact. The Planning Commission recommends the City Council approve the 
proposed amendments. 
V. CONFORMANCE WITH APPLICABLE CRITERIA: 
The Planning Commission found that the request was in conformance with the criteria 
contained in Section 13.5.2 of the Comprehensive Community Development Plan 
Policies and the criteria contained in Sections 4.033, 4.044 & 4.103 of the Development 
Code. 
VI. RECOMMENDATION: 
The Urban Area Planning Commission found that the request meets the criteria 
contained in Section. 13.5.2 of the Comprehensive Community Development Plan 
Policies and the criteria contained in Sections 4.033, 4.044 & 4.103 of the Development 
Code, and recommends the City Council: 
09-40500004 & 09-40500006-Flood Hazard District Page 2 of 4 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
City Council - Staff Report 
1. Approve the amendment of the Special Purpose District Map for the 
Flood Hazard District by adopting the current Flood Insurance Study (FIS) 
Volumes 1 and 2 and Flood Insurance Rate Maps (FIRM) for Josephine 
County, Oregon and Incorporated areas effective date December 3, 2009, 
issued by the Department of Homeland Security's Federal Emergency 
Management Agency (FEMA); 
2. Approve the amendment to Section 13.200 (Flood Hazard District) of the 
City of Grants Pass Development Code to be consistent with the National 
Flood Insurance Program (NFIP) and Oregon Model Code Provisions; 
and 
3. Approve the amendment to update Element 5 of the Comprehensive 
Plan, specifically the section under Flood Hazard (5.30) to reference the 
new FIS and FIRM effective December 3, 2009. 
VII. CITY COUNCIL ACTION: 
A. Positive Action: 
1. Approve the proposal as recommended. 
2. Approve the proposal with revisions (list): 
B. Negative Action: deny the request and adopt no amendments for the 
following reasons (list): 
C. Postponement: Continue item 
1. Indefinitely. 
2. To a date and time certain. 
VIII. INDEX TO EXHIBITS: 
1. Planning Commission's Findings of Fact and the Attached Record. 
Index to Exhibits: 
A. UAPC Staff Report: 
1. Flood Insurance Study (FIS) for Josephine County, Oregon 
and Incorporated areas, dated December 3, 2009 (full 
report is available in the Planning file). 
2. Flood Insurance Rate Maps (FIRM) dated December 3, 
2009 (full set of maps is available in the Community 
Development office). 
3. Revised Section 13.200 ~ Flood Hazard District 
Development Code. 
09-40500004 & 09-40500006 ~ Flood Hazard District Page 3 of 4 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
City Council - Staff Report 
4. Revised Element 5, Section 5.30, Flood Hazard located in 
the Comprehensive Plan. 
5. FEMA's "Letter of Final Determination" dated June 3, 2009. 
B. Minutes from September 23. 2009. UAPC hearing 
C. PowerPoint Presentation 
2. Revised Title 9 of the Municipal Code (fulf text is available in the Planning 
file). 
3. Letter of concern received from Sandra Loghry, dated 11/03/09. 
4. Letter of concern received from Nadine Ham, dated 11/04/09. 
NOTE: The application is not subject to the 120 day requirement per ORS 227.178. 
09-40500004 & 09-40500006 ~ Flood Hazard District Page 4 of 4 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
City Council - Staff Report 
CITY OF GRANTS PASS COMMUNITY DEVELOPMENT DEPARTMENT 
FLOOD HAZARD DISTRICT 
ZONING MAP AMENDMENT, SPECIAL PURPOSE DISTRICT MAP AMENDMENT 
AND DEVELOPMENT CODE TEXT AMENDMENT 
FINDINGS OF FACT ~ URBAN AREA PLANNING COMMISSION 
Procedure Type: Type IV: Planning Commission Recommendation 
and City Council Decision 
Project Number: 09-40500004 & 09-40500006 
Project Type: Zoning Map Amendment, Special Purpose District Map 
Amendment and Development Code Text Amendment 
Applicant: City of Grants Pass 
Planner Assigned: Lora Glover 
Application Received: July 17, 2009 
Application Complete: July 24, 2009 
Date of Staff Report: September 14, 2009 
Date of UAPC Hrng: September 23, 2009 
Date Findings of Fact 
Signed: 
October 14, 2009 
I. PROPOSAL: 
The proposal includes the following: 
1) Amend the Special Purpose District Map for the Flood Hazard District by adopting the 
current Flood Insurance Study (FIS) Volumes 1 and 2 and Flood Insurance Rate Maps 
(FIRM) for Josephine County, Oregon and incorporated areas effective date December 
3, 2009, issued by the Department of Homeland Security's Federal Emergency 
Management Agency (FEMA). 
2) Amend Section 13.200 (Flood Hazard District) of the City of Grants Pass 
Development Code to be consistent with the National Flood Insurance Program (NFIP) 
and Oregon Model Code Provisions. 
3) Update Element 5 of the Comprehensive Plan, specifically the section under Flood 
Hazard (5.30) to reference the new FIS and FIRM effective December 3, 2009. The 
revision is a modification to the narrative of the Comprehensive Plan and the change is 
reviewed as a minor amendment to the database in accordance with Section 13.5.2 of 
the Comprehensive Community Development Plan Policies document. No criteria are 
reviewed with the narrative change. 
4) The adopting ordinance for City Council adoption will repeal any conflicting or 
duplicate provisions contained in the Municipal Code related to flood hazard provisions. 
09-40500004 & 09-40500006 ~ Flood Hazard District 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
UAPC - Findings of Fact 
Page 1 of 11 
EXHIBIT I 
to ôc srm= HEfmr 
II. AUTHORITY AND CRITERIA: 
Sections 4.032, 4.042 and 4.102 of the City of Grants Pass Development Code provide 
the procedures for initiation of a Special Purpose District Map Amendment and 
Development Code Text Amendment. The proposed Special Purpose District Map 
Amendment and Development Code Text Amendment were initiated by the Community 
Development Director. 
Sections 2.060, 7.040 and 7.050 authorize the Urban Area Planning Commission to 
make a recommendation to the City Council and authorize the City Council to make a 
final decision on a land use matter requiring a Type IV procedure, in accordance with 
procedures of Section 2.060. 
The applicable criteria from the Development Code to be met include the following: 
• Section 4.033 -Zoning Map Amendment 
• Section 4.044 - Special Purpose District Amendment 
• Section 4.103 - Development Code Text Amendment 
III. APPEAL PROCEDURE: 
The City Council's final decision may be appealed to the State Land Use Board of 
Appeals (LUBA) as provided in state statutes. A notice of intent to appeal must be filed 
with LUBA within twenty-one (21) days of the Council's written decision. 
IV. PROCEDURE: 
A. An application for a Comprehensive Plan Amendment, Flood Hazard 
District Zoning Map Amendment, Special Purpose District Map 
Amendment and Development Code Text Amendment was submitted and 
deemed complete on July 17, 2009. The application processed in 
accordance with Section 2.060 of the Development Code, and Sections III 
and V of the 1998 Intergovernmental Agreement. 
B. Notice of the proposed amendment was mailed to the Oregon 
Department of Land Conservation and Development (DLCD) on July 17, 
2009, in accordance with ORS 197.610 and OAR Chapter 660-Division 
18. 
C. Notice of the proposed amendment was mailed to Josephine County on 
July 17, 2009, in accordance with the 1998 Intergovernmental 
Agreement. 
D. Notice of the September 23, 2009, Planning Commission hearing was 
mailed to potentially interested parties on September 3, 2009. 
09-40500004 & 09-40500006 - Flood Hazard District Page 2 of 11 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
UAPC - Findings of Fact 
E. Public notice of the September 23, 2009, Planning Commission hearing 
was published in the newspaper on September 19, 2009, in accordance 
with Sections 2.053 and 2.063 of the Development Code. 
F. A public hearing was held by the Planning Commission on September 23, 
2009, to consider the proposal and make a recommendation to City 
Council. 
V. SUMMARY OF EVIDENCE: 
A. The basic facts and criteria regarding this application are contained in the 
staff report, which is attached as Exhibit "A" and incorporated herein. 
B. The minutes of the September 23, 2009, Urban Area Planning 
Commission public hearing are attached as Exhibit "B" and incorporated 
herein. 
C. The PowerPoint Presentation given by staff at the September 23, 2009, 
public hearing is attached as Exhibit "C" and incorporated herein. 
VI. FINDINGS: 
The Urban Area Planning Commission found that the request meets the criteria 
contained in Section 13.5.2 of the Comprehensive Community Development Plan 
Policies and the criteria contained in Sections 4.033, 4.044 & 4.103 of the Development 
Code based on the reasons stated in the findings below. The vote was 7-0-0, with 
Commissioners Berlant, Kellenbeck, Arthur, Fowler, Fitzgerald, Fedosky and Richardson 
in favor. (Note: There is currently one vacancy on the commission.) 
VII. GENERAL FINDINGS OF FACT - BACKGROUND AND DISCUSSION: 
The City of Grants Pass participates in the National Flood Insurance Program (NFIP). 
By having ordinances that comply with the NFIP, residents are eligible to obtain flood 
insurance through the program. 
FEMA has recently completed the process of updating the Flood Insurance Study (FIS) 
and Flood insurance Rate Maps (FIRMs) throughout the country and state, including 
Josephine County. Both the City of Grants Pass and Josephine County will be adopting 
the complete FIS and all of the FIRM maps covering Josephine County and the 
incorporated areas. By doing so, there will not be a need to undertake an additional 
amendment in the event the Urban Growth Boundary is adjusted in the future. 
The purpose of the new FIS is to revise and update information on the existence and 
severity of flood hazards in the geographic area of Josephine County, to include the 
Cities of Cave Junction and Grants Pass. The original hydrologic and hydraulic 
analyses were performed by the U.S. Geological Survey (USGS), and completed in 
09-40500004 & 09-40500006 ~ Flood Hazard District Page 3 of 11 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
UAPC - Findings of Fact 
1979. The countywide updated was performed by WES i uonsultanis, inc., and was 
completed in October 2008. 
On June 3, 2009, FEMA mailed their "Letter of Final Determination" instructing the City 
that the new study and maps must be adopted by December 3, 2009, to maintain its 
participation in the flood insurance program. The FIS and FIRM maps currently in effect 
are dated September 27, 1991. The floodway boundary and floodway maps have been 
incorporated into the new FIRM maps. The existing FIS and FIRM maps will be 
maintained for historical reference. 
Failure to adopt the study and maps by December 3 means the City would be 
suspended from the flood insurance program effective on that date, leaving citizens at 
risk of flood damage that would not be covered by the National Flood Insurance 
Program. 
Adoption of the new FIS and FIRM maps requires that Element 5 of the Comprehensive 
Plan, specifically the section under Flood Hazard (5.30) be amended to reference the 
new FIS and FIRM effective December 3, 2009. The revision is a modification to the 
narrative of the Comprehensive Plan and the change is reviewed as a minor amendment 
to the database in accordance with Section 13.5.2 of the Comprehensive Community 
Development Plan Policies document. No criteria are reviewed with the narrative 
change. 
In addition to adopting the new FIS and FIRMs, FEMA's "Letter of Final Determination" 
states additional requirements must be met under Section 1361 of the National Flood 
Insurance Act of 1968, as amended, within six (6) months of the date of their letter. 
Specifically, the standards of Paragraph 60.3(d) of the NFIP regulations must be met. 
The letter goes on to list the following actions in order to be in compliance: 
• Amend existing regulations to incorporate any additional requirements of 
Paragraph 60.3(d); 
• Adopt all standards of Paragraph 60.3(d) into one new, comprehensive 
set of regulations; or 
• Show evidence that regulations have previously been adopted that meet 
or exceed the minimum requirements. 
The "Letter of Final Determination" included a "Summary of Map Actions" documenting 
previous "Letter of Map Change (LOMC) actions (including Letters of Map Amendment 
and Letters of Map Revision) which will be superseded by the revised FIRM panels. 
Many property owners will find little change in the flood information for their property, 
while others will be required to meet the new elevation requirements for all new 
structures and substantial improvements to existing structures. 
An example of the existing and amended maps is provided: 
09-40500004 & 09-40500006 ~ Flood Hazard District Page 4 of 11 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
UAPC - Findings of Fact 
EXISTING FLOOD MAPS 
A 
09-40500004 & 09-40500006 ~ Flood Hazard District Page 5 of 11 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
UAPC - Findings of Fact 
09-40500004 & 09-40500006 ~ Flood Hazard District Page 6 of 11 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
UAPC - Findings of Fact 
The summary notes one LOMC for 643/645 SW Balsam Drive, Grants Pass, Oregon, 
which will be superseded by new detailed flood hazard information based upon revised 
hydrologic and hydraulic analyses. The property owners were mailed a separate notice 
concerning the revised FIRMs, but they have not responded as of the date of this report. 
The existing regulations in Article 13 of the Development Code have been reviewed 
against Paragraph 60.3 (d) and the State's Model Flood Plain Ordinance for consistency. 
The additions and changes to Section 13.200 are reflective of the regulations from the 
above documents. 
The Municipal Code also includes flood hazard regulations. All flood hazard provisions 
have been incorporated into Section 13.200 of the Development Code. The final 
ordinance for approval by the City Council will repeal any old ordinances and existing 
language that has been incorporated into the Development Code. 
VIII. FINDINGS OF FACT - CONFORMANCE WITH APPLICABLE CRITERIA ~ 
SECTION 4.033 OF THE DEVELOPMENT CODE 
Criteria for Amendment. The Zoning Map may be amended by the review bodies 
provided that all the following criteria are met: 
(1) The proposed use, if any, is consistent with the proposed Zoning District. 
(2) The proposed Zoning District is consistent with the Comprehensive Pian 
Land Use Map designation. 
(3) A demonstration that existing or proposed levels of basic urban services 
can accommodate the proposed or potential development without 
adverse impact upon the affected service area or without a change to 
adopted utility plans. 
(4) A demonstration that the proposed amendment is consistent with the 
functions, capacities and performance standards of transportation 
facilities identified in the Master Transportation Plan. 
(5) The natural features of the site are conducive to the proposed Zoning 
District. 
(6) The proposed zone is consistent with the requirements of all overlay 
Districts that include the subject property. 
(7) The timing of the zone change request is appropriate in terms of the 
efficient provision or upgrading of basic urban services versus the 
utilization of other buildable lands in similar zoning districts already 
provided with basic urban services. 
(8) In the case of rezoning from the Urban Reserve District, that the criteria 
for conversion are met, as provided in Section 4.034. 
09-40500004 & 09-40500006 ~ Flood Hazard District Page 7 of 11 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
UAPC - Findings of Fact 
Planning Commission Response: Not Applicable. Although the proposed 
amendments do noi related to zoning, it was found that review and 
acknowledgement of the criteria was important. The adoption of the new FIS and 
FIRM will result in a map change to the flood hazard, one of the special purpose 
districts regulated by the City of Grants Pass. The amendment affects properties 
along the Rogue River and Gilbert Creek. However, the above listed criteria are 
found not applicable to the amendment. 
IX. FINDINGS OF FACT - CONFORMANCE WITH APPLICABLE CRITERIA ~ 
SECTION 4.044 OF THE DEVELOPMENT CODE 
(1) The Flood Hazard District map is the Flood Boundary - Floodway Map 
established by the Federal Emergency Management Agency (FEMA) in 
the scientific and engineering reports entitled "The Flood Insurance Study 
for the City of Grants Pass" and the "The Flood Insurance Study for the 
County of Josephine County, State of Oregon". The flood hazard district 
map may be amended only by FEMA in the procedure provided for Flood 
Boundaries - Floodway Maps. 
(2) Upon receipt of proper authorization from FEMA, the Director shall begin 
administering the revised Flood Hazard District, as designated by FEMA. 
Planning Commission Response: Satisfied. As noted above, on June 3, 
2009, FEMA mailed their "Letter of Final Determination" instructing the City that 
the new FIS and FIRM maps must be adopted by December 3, 2009, to maintain 
its participation in the flood insurance program. Upon adoption, the updated FIS, 
FIRM and Section 13.200 of the Development Code, will be used to regulate 
properties in the flood hazard area. 
X. FINDINGS OF FACT - CONFORMANCE WITH APPLICABLE CRITERIA ~ 
SECTION 4.103 OF THE DEVELOPMENT CODE 
The text of the Development Code may be recommended for amendment and 
amended provided that all of the following criteria of Section 4.103 of the 
Development Code are met. 
CRITERION 1: The proposed amendment is consistent with the purpose of the 
subject section and article. 
Planning Commission Response: Satisfied. The proposal amends Section 
13.200 "Flood Hazard District". The purpose statement of Section 13.210 states 
that the intent of the Flood Hazard District is to designate areas that may be 
hazardous to development due to flooding. The District is to provide standards 
that specify how development will minimize public and private losses due to flood 
conditions in specific areas by provisions designed to: 
09-40500004 & 09-40500006 ~ Flood Hazard District Page 8 of 11 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
UAPC - Findings of Fact 
• Protect human life and health; 
• Minimize expenditure of public money; 
• Minimize need for rescue and relief efforts; 
• Minimize prolonged business interruptions; 
• Minimize damage to public facilities; 
• Help maintain a stable tax base; 
• Notify potential buyers of special flood hazard; and 
• Ensure those who occupy flood hazard areas accept responsibility 
for their actions. 
The proposed amendment is consistent with the purpose statement of Section 
13.210 because it brings the Development Code into compliance with regulations 
of the National Flood Insurance Program (NFIP, Paragraph 60.3(d)) as required 
under Section 1361 of the National Flood Insurance Act of 1968, as amended. 
Specifically, the proposed text amendment will: 
• Consolidate various flood ordinances currently located within the 
Municipal Code, into one iocation in the Development Code; 
• Provide additional terms and definitions for the flood hazard 
district; and 
• Brings construction standards for crawlspaces and below-grade 
crawlspaces into compliance. 
CRITERION 2: The proposed amendment is consistent with other provisions of 
this code. 
Planning Commission Response: Satisfied. As noted under Section 13.010 
of the Development Code, special purpose districts, to include the Flood Hazard 
District, provide standards intended to mitigate natural hazards, to protect natural 
features and to mitigate land use conflicts. The standards applicable for the 
Flood Hazard District are in addition to the standards of the underlying zoning 
district. Therefore, the proposed amendment is internally consistent with other 
provisions of the Development Code. 
CRITERION 3: The proposed amendment is consistent with the goals and 
policies of the Comprehensive Plan, and most effectively carries out those goals 
and policies of all alternatives considered. 
Planning Commission Response: Satisfied. The proposed amendment is 
consistent with the goals and policies of the Comprehensive Plan. Section 5.2 of 
Element 5 of the Comprehensive Plan Policy document states that the 
Development Code shall: 
09-40500004 & 09-40500006 ~ Flood Hazard District Page 9 of 11 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
UAPC - Findings of Fact 
• Regulate development within the 100-yearfloodplain and 
floodway as required to maintain participation in the National 
Flood Insurance Program; 
• Provide methods to determine and appeal the location of the 100-
year floodplain and floodway boundaries when there appears to 
be discrepancies between official mapped boundaries and actual 
field conditions. 
• Facilitate flood hazard policies. 
The proposed changes to Section 13.200 of the Development Code and the 
narrative of the Comprehensive Plan help implement the policy statements. As 
noted above, the narrative of Element 5 of the Comprehensive Plan (Section 
5.30 ~ Flood Hazard) is being modified to reference the new FIS and FIRM 
effective December 3, 2009. The alternative of not adopting the new FIS, FIRM 
and Code sections is not a viable option as it would cause suspension with the 
City's participation in the NFIP. 
CRITERION 4: The proposed amendment is consistent with the functions, 
capacities, and performance standards of transportation facilities identified in the 
Master Transportation Plan. 
Planning Commission Response: Not Applicable. The proposed 
amendments do not pertain to the performance standards of the Master 
Transportation Plan. 
XI. RECOMMENDATION: 
A. The Urban Area Planning Commission recommends that City Council 
APPROVE the amendment of the Special Purpose District Map for the 
Flood Hazard District by adopting the current Flood Insurance Study (FIS) 
Volumes 1 and 2 and Flood Insurance Rate Maps (FIRM) for Josephine 
County, Oregon and Incorporated areas effective date December 3, 2009, 
issued by the Department of Homeland Security's Federal Emergency 
Management Agency (FEMA). 
B. The Urban Area Planning Commission recommends that City Council 
APPROVE the proposed amendment to Section 13.200 (Flood Hazard 
District) of the City of Grants Pass Development Code to be consistent 
with the National Flood Insurance Program (NFIP) and Oregon Model 
Code Provisions. 
C. The Urban Area Planning Commission recommends that City Council 
APPROVE the amendment to update Element 5 of the Comprehensive 
Plan, specifically the section under Flood Hazard (5.30) to reference the 
new FIS and FIRM effective December 3, 2009. 
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UAPC - Findings of Fact 
XII. APPROVED BY THE URBAN AREA PLANNING COMMISSION this 14,h day of 
October, 2009. 
Commissioner Gary Beriant, Chair 
NOTE: The application is not subject to the 120 day requirement per ORS 
227.178. 
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UAPC - Findings of Fact 
CITY OF GRANTS PASS COMMUNITY DEVELOPMENT DEPARTMENT 
FLOOD HAZARD DISTRICT 
ZONING MAP AMENDMENT, SPECIAL PURPOSE DISTRICT MAP AMENDMENT 
AND DEVELOPMENT CODE TEXT AMENDMENT 
STAFF REPORT-URBAN AREA PLANNING COMMISSION 
Procedure Type: Type IV: Planning Commission Recommendation 
and City Council Decision 
Project Number: 09-40500004 & 09-40500006 
Project Type: Zoning Map Amendment, Special Purpose District Map 
Amendment and Development Code Text Amendment 
Applicant: City of Grants Pass 
Planner Assigned: Lora Glover 
Application Received: July 17, 2009 
Application Complete: July 24, 2009 
Date of Staff Report: September 14, 2009 
Date of UAPC Hrng: September 23, 2009 
I. PROPOSAL: 
The proposal includes the following: 
1) Amend the Special Purpose District Map for the Flood Hazard District by adopting the 
current Flood Insurance Study (FIS) Volumes 1 and 2 and Flood Insurance Rate Maps 
(FIRM) for Josephine County, Oregon and Incorporated areas effective date December 
3, 2009, issued by the Department of Homeland Security's Federal Emergency 
Management Agency (FEMA). See Exhibit 1 for FIS and See Exhibits for FIRMs 
Note: FIS Volume 1 is attached in its .entirety; Volume 2 contains all the flood profiles 
. and is available at the Community Development office for review. 
2). Amend Section 13.200 (Flood Hazard .District) of the City of Grants Pass 
Development Code to be consistent with the National Flood Insurance Program (NFIP) 
and Oregon Model Code Provisions. See Exhibit 3 
3) Update Element 5 of the Comprehensive Plan, specifically the section under Flood 
Hazard (5.30) to reference the new FIS and FIRM.effective December 3, 2009. The 
revision is a modification to the narrative of the Comprehensive Plan and the change is 
reviewed as a minor amendment to the database in accordance with Section 13.5.2 of 
the Comprehensive Community Development Plan Policies document. No criteria are 
reviewed with the narrative change. See Exhibit 4 
4) The adopting ordinance for City Council adoption will repeal any conflicting or 
duplicate provisions contained in the Municipal Code related to flood hazard provisions. 
09-40500004 & 09-40500006 ~ Flood Hazard District 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
UAPC-Staff Report 
Page 1 of 10 
TÒ UtifcJFtp 
II. AUTHORITY AND CRITERIA: 
Sections 4.032, 4.042 and 4.102 of the City of Grants Pass Development Code provide 
the procedures for initiation of a Special Purpose District Map Amendment and 
Development Code Text Amendment. The proposed Special Purpose District Map 
Amendment and Development Code Text Amendment were initiated by the Community 
Development Director. 
Sections 2.060, 7.040 and 7.050 authorize the Urban Area Planning Commission to 
make a recommendation to the City Council and authorize the City Council to make a 
final decision on a land use matter requiring a Type IV procedure, in accordance with 
procedures of Section 2.060. 
The applicable criteria from the Development Code to be met include the following: 
• Section 4.033 -Zoning Map Amendment 
Section 4.044 - Special Purpose District Amendment 
Section 4.103 - Development Code Text Amendment 
III. APPEAL PROCEDURE: 
The City Council's final decision may be appealed to the State Land Use Board of 
Appeals (LUBA) as provided in state statutes. A notice of intent to appeal must be filed 
with LUBA within twenty-one (21) days of the Council's written decision. 
IV. BACKGROUND AND DISCUSSION: 
The City of Grants Pass participates in the National Flood Insurance Program (NFIP). 
By having ordinances that comply with the NFIP, residents are eligible to obtain flood 
insurance through the program. 
FEMA has recently completed the process of updating the Flood Insurance Study (FIS) 
and Flood Insurance Rate Maps (FIRMsj throughout the country and state, including 
Josephine County. Both the City of Grants Pass and Josephine County will be adopting 
the complete FIS and all of the FIRM maps covering Josephine County and the 
incorporated areas. By doing so, there will not be a need to undertake an additional 
amendment in the event the Urban Growth Boundary is adjusted in the future. 
The,purpose of the new FIS is to revise and update information on the existence and 
severity of flood hazards in the geographic area of Josephine County, to include the 
Cities of Cave Junction and Grants Pass, The original hydrologic and hydraulic 
analyses were performed by the U.S. Geological Survey (USGS), and completed in 
1979. The countywide updated was performed by WEST Consultants, Inc., and was 
completed in October 2008. 
On June 3, 2009, FEMA mailed their "Letter of Final Determination" instructing the City 
that the new study and maps must be adopted by December 3, 2009, to maintain its 
09-40500004 & 09-40500006 ~ Flood Hazard District Page 2 of 10 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
UAPC-Staff Report 
participation in the flood insurance program (See Exhibit 5). The FIS and FIRM maps 
currently in effect are dated September 27, 1991. The floodway boundary and floodway 
maps have been incorporated into the new FIRM maps. The existing FIS and FIRM 
maps will be maintained for historical reference. 
Failure to adopt the study and maps by December 3 means the City would be 
suspended from the flood insurance program effective on that date, leaving citizens at 
risk of flood damage that would not be covered by the National Flood Insurance 
Program. 
Adoption of the new FIS and FIRM maps requires that Element 5 of the Comprehensive 
Plan, specifically the section under Flood Hazard (5.30) be amended to reference the 
new FIS and FIRM effective December 3, 2009. The revision is à modification to the 
narrative of the Comprehensive Plan and the change is reviewed as a minor amendment 
to the database in accordance with Section 13.5.2 of the Comprehensive Community 
Development Plan Policies document. No criteria are reviewed with the narrative 
change. 
In addition to adopting the new FIS and FIRMs, FEMA's "Letter of Final Determination" 
states additional requirements must be met under Section 1361 of the National Flood 
Insurance Act of 1968, as amended, within six (6) months of the date of their letter. 
Specifically, the standards of Paragraph 60.3(d) of the NFIP regulations must be met. 
The letter goes on to list the following actions in order to be in compliance: 
• Amend existing regulations to incorporate any additional requirements of 
Paragraph 60.3(d); 
• Adopt all standards of Paragraph 60.3(d) into one new, comprehensive 
set of regulations; or 
• Show evidence that regulations have previously been adopted that meet 
' or exceed the minimum requirements. 
Thé "Letter of Final Determination" included a "Summary of Map Actions" documenting 
previous "Letter of Map Change (LOMC) actions (including Letters of Map Amendment 
and Letters of Map Revision) which will be superseded by the revised FIRM panels.. 
Many property owners will find little change in the flood information for their property, 
while others will be required to meet the new elevation requirements for all new 
structures and substantial improvements to existing structures. 
An example of the existing and amended maps is provided: 
09-40500004 & 09-40500006-Flood Hazard District Page 3 of 10 
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UAPC-Staff Report 
EXISTING FLOOD MAPS 
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Development Text Amendment 
UAPC-Staff Report 
09-40500004 & 09-40500006 ~ Flood Hazard District 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
UAPC-Staff Report 
Page 5 of 10 
The summary notes one LOMC for 643/645 SW Balsam Drive, Grants Pass, Oregon, 
which will be superseded by new detailed flood hazard information based upon revised 
hydrologic and hydraulic analyses. The property owners were mailed a separate notice 
concerning the revised FIRMs, but they have not responded as of the date of this report. 
The existing regulations in Article 13 of the Development Code have been reviewed 
against Paragraph 60.3 (d) and the State's Model Flood Plain Ordinance for consistency. 
The additions and changes to Section 13.200 are reflective of the regulations from the 
above documents. 
The Municipal Code also includes flood hazard regulations. All flood hazard provisions 
have been incorporated into Section 13.200 of the Development Code. The final 
ordinance for approval by the City Council will repeal any old ordinances and existing 
language that has been incorporated into the Development Code. 
V. CONFORMANCE WITH APPLICABLE CRITERIA ~ SECTION 4,033 OF THE 
DEVELOPMENT CODE 
Criteria for Amendment. The Zoning Map may be amended by the review bodies 
provided that all the following criteria are met: 
(1) The proposed use, if any, is consistent with the proposed Zoning District. 
(2) The proposed Zoning District is consistent with the Comprehensive Plan 
Land Use Map designation. 
(3) A demonstration that existing or proposed levels of basic urban services 
can accommodate the proposed or potential development without 
adverse impact upon the affected service area or without a change to 
adopted utility plans. 
(4) A demonstration that the proposed amendment is consistent with the 
functions, capacities and performance standards of transportation 
facilities identified in the Master Transportation Plan. 
(5) The natural features of the site are conducive to the proposed Zoning 
District. 
(6) The proposed zone is consistent with the requirements of all overlay 
Districts that include the subject property. 
(7) The timing of the zone change request is appropriate in terms of the 
efficient provision orupgrading of basic urban services versus the 
utilization of other buildable lands in similar zoning districts already 
provided with basic urban services. 
(8) In the case of rezoning from the Urban Reserve District, that the criteria 
for conversion are met, as provided in Section 4.034. 
09-40500004 & 09-40500006- Flood Hazard District Page 6 of 10 
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UAPC-Staff Report 
Staff Response: Not Applicable. Although the proposed amendments do not 
related to zoning, it was found that review and acknowledgement of the criteria 
was important. The adoption of the new FIS and FIRM will result in a map 
change to the flood hazard, one of the special purpose districts regulated by the 
City of Grants Pass. The amendment affects properties along the Rogue River 
and Gilbert Creek. However, the above listed criteria are found not applicable to 
the amendment. 
VI. CONFORMANCE WITH APPLICABLE CRITERIA - SECTION 4.044 OF THE 
DEVELOPMENT CODE 
(1) The Flood Hazard District map is the Flood Boundary - Floodway Map 
established by the Federal Emergency Management Agency (FEMA) in 
the scientific and engineering reports entitled "The Flood Insurance Study 
for the City of Grants Pass" and the "The Flood Insurance Study for the 
County of Josephine County, State of Oregon". The flood hazard district 
map may be amended only by FEMA in the procedure provided for Flood 
Boundaries - Floodway Maps. 
(2) Upon receipt of proper authorization from FEMA, the Director shall begin 
administering the revised Flood Hazard District, as designated by FEMA. 
Staff Response: Satisfied. As noted above, on June 3, 2009, FEMA mailed 
their "Letter of Final Determination" instructing the City that the new FIS and 
FIRM maps must be adopted by December 3, 2009, to maintain its participation 
in the flood insurance program. Upon adoption, the updated FIS, FIRM and 
Section 13.200 of the Development Code, will be used to regulate properties in 
the flood hazard area. 
VII. CONFORMANCE WITH APPLICABLE CRITERIA - SECTION 4.103 OF THE 
DEVELOPMENT CODE 
The text of the Development Code may be recommended for amendment and 
amended provided that all of the following criteria of Section 4.103 of the 
Development Code are met. 
CRITERION 1: The proposed amendment is consistent with the purpose of the 
subject section and article. 
Staff Response: Satisfied. The proposal amends Section 13.200 "Flood 
Hazard District". The purpose statement of Section 13.210 states that the intent 
of the Flood Hazard District is to designate areas that may be hazardous to 
development due to flooding. The District is to provide standards that specify 
how development will minimize public and private losses due to flood conditions 
in specific areas by provisions designed to: 
09-40500004 & 09-40500006 ~ Flood Hazard District Page 7 of 10 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment 
UAPC-Staff Report 
• Protect human life and health; 
• Minimize expenditure of public money; 
• Minimize need for rescue and relief efforts; 
• Minimize prolonged business interruptions; 
• Minimize damage to public facilities; 
• Help maintain a stable tax base; 
• Notify potential buyers of special flood hazard; and 
• Ensure those who occupy flood hazard areas accept responsibility 
for their actions. 
The proposed amendment is consistent with the purpose statement of Section 
13.210 because it brings the Development Code into compliance with regulations 
of the National Flood Insurance Program (NFIP, Paragraph 60.3(d)) as required 
under Section 1361 of the National Flood Insurance Act of 1968, as amended. 
Specifically, the proposed text amendment will: 
• Consolidate various flood ordinances currently located within the 
Municipal Code, into one location in the Development Code, 
• Provide additional terms and definitions for the flood hazard 
district; and 
• Brings construction standards for crawlspaces and below-grade 
, crawlspaces into compliance. 
CRITERION 2: The proposed amendment is consistent with other provisions of 
this code. 
Staff Response: Satisfied. As noted under Section 13.010 of the Development 
Code, special purpose districts, to include the Flood Hazard District, provide 
standards intended to mitigate natural hazards, to protect natural features and to 
mitigate land use conflicts. The standards applicable for the Flood Hazard 
District are in addition to the standards of the underlying zoning district. 
Therefore, .the proposed amendment is internally consistent with other provisions 
of the Development Code. 
CRITERION 3: The proposed amendment is consistent with the goals and 
policies of the Comprehensive Plan, and most effectively carries out those goals 
and policies of all alternatives considered. 
Staff Response: Satisfied. The proposed amendment is consistent with the 
goals and policies of the Comprehensive Plan. Section 5.2 of.Element.5 of the 
Comprehensive Plan Policy document states that the Development Code shall: 
• Regulate development within the 100-year floodplain and 
floodway as required to maintain participation in the National 
Flood Insurance Program; 
0940500004 & 09-40500006 ~ Flood Hazard District Page 8 of 10 
Zoning Map Amendment, Special Purpose District Map Amendment, and 
Development Text Amendment . 
UAPC-Staff Report 
• Provide methods to determine and appeal the location of the 100-
year floodplain and floodway boundaries when there appears to 
be discrepancies between official mapped boundaries and actual 
field conditions. 
® Facilitate flood hazard policies. 
The proposed changes to Section 13.200 of the Development Code and the 
narrative of the Comprehensive Plan help implement the policy statements. As 
noted above, the narrative of Element 5 of the Comprehensive Plan (Section 
5.30 - Flood Hazard) is being modified to reference the new FIS and FIRM 
effective December 3, 2009. The alternative of not adopting the new FIS, FIRM 
and Code sections is not a viable option as it would cause suspension with the 
City's participation in thè NFIP. 
CRITERION 4: The proposed amendment is consistent with the functions, 
capacities, and performance standards of transportation facilities identified in the 
Master Transportation Plan. 
Staff Response: Not Applicable. The proposed amendments do not pertain to 
the performance standards of the Master Transportation Plan. 
VIII. RECOMMENDATION: 
A. It is recommended that the Urban Area Planning Commission 
recommend that City Council APPROVE the amendment of the Special 
Purpose District Map for the Flood Hazard District by adopting the current 
Flood Insurance Study (FIS) Volumes 1 and 2 and Flood Insurance Rate 
Maps (FIRM) for Josephine County, Oregon and Incorporated areas 
effective date December 3, 2009, issued by the Department of Homeland 
Security's Federal Emergency Management Agency (FEMA). 
B. It is recommended that the Urban Area Planning Commission 
recommend that City Council APPROVE the proposed amendment to 
Section 13.200 (Flood Hazard District) of thé City of Grants Pass 
Development Code to be consistent with the National Flood Insurance 
Program (NFIP) and Oregon Model Code Provisions. 
C. It is recommended that the Urban Area Planning Commission 
recommend that City Council APPROVE the amendment to update 
Element 5 of the Comprehensive Plan, specifically the section under 
Flood Hazard (5.30) to reference the new FIS and FIRM effective 
December 3, 2009. 
09-40500004 & 09-40500006 -Flood Hazard District Page 9 of 10 
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UAPC-Staff Report 
IX. PLANNING COMMISSION ACTION: 
A. Positive Action: Recommend approval of the request: 
1. as submitted. 
2. as modified by the Planning Commission (list): 
B. Negative Action: Recommend denial of the request for the following 
reasons (list): 
C. Postponement: Continue item 
1. indefinitely. 
2. to a time certain. 
NOTE: The application is not subject to the 120 day requirement per ORS 
227.178. 
X. INDEX TO EXHIBITS: 
1. Flood Insurance Study (FIS) for Josephine County, Oregon and 
Incorporated areas, dated December 3, 2009 (full report is 
available in the Planning file). 
2. Flood Insurance Rate Maps (FIRM) dated December 3, 2009 (full 
set of maps is available in the Community Development office). 
3. Revised Section 13.200 ~ Flood Hazard District Development 
Code. 
4. Revised Element 5, Section 5.30, Flood Hazard located in the 
Comprehensive Plan 
5. FEMA's "Letter of Final Determination" dated June 3, 2009. 
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UAPC - Staff Report 
FLOOD 
INSURANCE 
STUDY 
JOSEPHINE COUNTY, OREGON 
AND INCORPORATED AREAS 
VOLUME 1 OF 2 
COMMUNITY COMMUNITY 
NAME NUMBER 
CAVE JUNCTION, CITY OF 410107 
GRANTS PASS, CITY OF 410108 
JOSEPHINE COUNTY UNINCORPORATED AREAS 415 5 90 
Effective: 
December 3, 2009 
Federal Emergency Management Agency 
Flood Insurance Study Number 
41033CV001A 
i 
NOTICE TO 
FLOOD INSURANCE STUDY USERS 
Communities participating in the National Flood Insurance Program have established repositories of flood 
hazard data for floodplain management and flood insurance purposes. This Flood Insurance Study (FIS) 
report may not contain all data available within the Community Map Repository. Please contact the 
Community Map Repository for any additional data. 
Selected Flood Insurance Rate Map panels for the community contain information that was previously shown 
separately on the corresponding Flood Boundary and Floodway Map panels (e.g. floodways, cross sections). 
In addition, former flood hazard zone designations have been changed as follows: 
Old Zone New Zone 
Al through A30 AE 
VI through V30 VE 
B X (shaded) 
C X (unshaded) 
Part or all of this maybe revised and republished at any time. In addition, part of this FIS may be revised by 
a Letter of Map Revision process, which does not involve republication or redistribution of the FIS. It is, 
therefore, the responsibility of the user to consult with community officials and to check the community 
repository to obtain the most current FIS report components. 
This FIS report was revised on December 3,2009. User should refer to Section 10.0, Revision Descriptions, 
for further information. Section 10.0 is intended to present the most up-to-date information for specific 
portions of this FIS report. Therefore, users of this FIS report should be aware that the information presented 
in Section 10.0 supersedes information in Sections 1.0 through 9.0 of this FIS report 
TABLE OF CONTENTS - VOLUME 1 
- " Page 
1.0 INTRODUCTION 1 
1.1 Purpose of Study 1 
1.2 Authority and Acknowledgements 1 
1.3 Coordination 1 
2,0 AREA STUDIED 3 
2.1 Scope of Study 3 
2.2 Community Description 5 
2.3 Principal Flood Problems 7 
2.4 Flood Protection Measures 9 
3.0 ENGINEERING METHODS 10 
3.1 Hydrologie Analyses 10 
3.2 Hydraulic Analyses 15 
3.3 Vertical Datum 24 
4.0 FLOODPLAIN MANAGEMENT APPLICATIONS 24 
4.1 Floodplain Boundaries 25 
4.2 . Floodways 26 
5.0 INSURANCE APPLICATION 47 
6.0 FLOOD INSURANCE RATE MAP - 4 7 -
7.0 OTHER STUDIES 48 
8.0 LOCATION OF DATA 50 
9.0 BIBLIOGRAPHY AND REFERENCES 50 
10.0 REVISION DESCRIPTION 53 
FIGURES 
Figure 1 - Flo.odway Schematic 27 
TABLES 
Table ! - Initial, Intermediate, and Final CCO Meetings 
Table 2 - Flooding Sources Studied by Detailed Methods 
Table 3 - Flooding Sources Studied by Approximate Methods 
Table 4 - Summary of Discharges 
Table 5 - Range of Manning's Roughness Values 
Table 6 - Floodway Data 
Table 7 - Flood Insurance Zones Within Each Community 
Table 8 - Community Map History 
2 
3 . 
4 
11 
15 
28 
47 
49 
TABLES (continued^ 
Table 9 - Revised Study Descriptions . 53 
TABLE OF CONTENTS - VOLUME 2 
EXHIBITS 
Exhibit 1 - Flood Profiles 
Applegate River 
Deer Creek 
Gilbert Creek 
Illinois River 
East Fork Illinois River 
West Fork Illinois River 
Jumpoff Joe Creek 
Louse Creek 
Murphy Creek 
Rogue Rive-
Rogue River Right Overbank 
Slate Creek 
Waters Creek • 
Panels 
Panels 
Panels 
Panels 
Panels 
Panels 
Panels 
Panels 
Panels 
Panels 
Panel 
Panels 
Panels 
01P-18P 
19P-23P 
24P-29P 
30P-35P 
36P-47P 
48P-59P 
60P-66P 
67P-80P 
81P-86P 
S7P-IÖ0P 
101P 
102P-108P 
109P-U1P 
PUBLISHED SEPARATELY 
Flood Insurance Rate Map Index 
Flood Insurance Rate Map 
i l 
FLOOD INSURANCE STUDY 
JOSEPHINE COUNTY, OREGON AND INCORPORATED AREAS 
1.0 INTRODUCTION 
1.1 Purpose of Study 
This Flood Insurance Study revises and updates information on the existence and severity of 
flood hazards in the geographic area of Josephine County, including the Cities of Cave 
Junction and Grants Pass; and the unincorporated areas of Josephine County (referred to 
collectively herein as Josephine County), and aids in the administration of the National Flood 
Insurance Act of 1968 and the Flood Disaster Protection Act of 1973. This study has 
developed flood-risk data for various areas of the community that will be used to establish 
actuarial flood insurance rates and to assist the community in its efforts to promote sound 
floodplain management. Minimum floodplain management requirements for participation in 
the National Flood Insurance Program (NFIP) are set forth in the Code of Federal 
Regulations at 44 CFR, 60.3. 
In some states or communities, floodplain management criteria or regulations may exist that 
are more restrictive or comprehensive than the minimum Federal requirements. In such 
cases, the more restrictive criteria take precedence and the State (or other jurisdictional 
agency) will be able to explain them. 
1.2 Authority and Acknowledgments 
The sources of authority for this Flood Insurance Study are the National Flood Insurance Act 
of 1968 and the Flood Disaster Protection Act of 1973. 
The hydrologic and hydraulic analyses for the studies in Grants Pass and unincorporated 
Josephine County were performed by the U.S. Geological Survey (USGS) for the Federal 
Emergency Management Agency (FEMA) under Interagency Agreement No. IAA-H-14-78, 
Project Order No. 8. The analysis for the City of Cave Junction was performed under 
Amendment 1-2 of the same contract. Analyses for the City of Cave Junction and 
unincorporated Josephine County were completed in July 1980. The original analysis for the 
. City of Grants Pass was completed in July 1979. The restudy of the reach of the Rogue 
River flowing through Grants Pass was performed by OTÁK, Incorporated. This additional 
work was completed in December 1989 for FEMA under Contract No. EMW-89-C-2847. 
The countywide update was performed by WEST Consultants, Inc. for FEMA under 
ContractNo. EMS-20010-CO-0068.. Updated aerial photography daied 2005 was used in the 
analysis. Work on the countywide update was completed in October 2008. 
1.3 Coordination 
The dates of the initial, intermediate, and final CCO meetings held for the previous FIS 
reports for "Josephine County and the incorporated communities within its boundaries are 
shown in Table 1, "Initial, Intermediate, and Final CCO Meetings". They were attended by 
representatives of FEMA, the U.S. Geological Survey, the communities, and the study 
contractor. 
1 
Table 1. Initial, Intermediate, and Final CCO Meetings 
Community Initial CCO Date Final CCO Date 
Cave Junction, City of January 12, 1978 May 12, 1980 June 3, 1981 
Grants Pass, City of January 1978 ^ J 9 , 8 ^ " d September 19, 1990 
Josephine County, 
unincorporated areas 
May 25, 1988 
January 12, 1978 May 12, 1980 June3, 1981 
Streams requiring detailed study were identified at a meeting held on January 12,1978. In 
attendance were representatives of the U.S. Geological Survey, FEMA, Josephine County, 
and the communities of Cave Junction and Grants Pass. The U.S. Army Corps of Engineers 
(COE) provided hydrologic data for the original Rogue River study, reflecting anticipated 
flood-control regulation from Lost Creek Dam, located 55.4 miles upstream from the city. 
Results of the hydrologic analyses were coordinated with the COE. Ending water-surface 
elevations at Savage Rapids Dam on the Rogue River were consistent with data furnished by 
the U.S. Geological Survey for the Jackson County Flood Insurance Study (Reference 1), 
On May 12, 1980, an intermediate meeting reviewing preliminary work done by the study 
contractor was attended by representatives of the study contractor, FEMA, the City of Cave 
Junction, and Josephine County. 
On May 27,1980, the results of the original study for the City of Grants Pass were reviewed 
at the final community coordination meeting attended by representatives of FEMA, the city, 
and the study contractor. No problems were raised at die meeting. 
A final coordination meeting for the City of Cave Junction and Josephine County was held 
on June 3, 1981. The meeting was attended by representatives of the FEMA, the study 
contractor, the City of Cave Junction, and Josephine County. All problems raised at the 
meeting were resolved. 
Several flooding sources within Grants Pass, including portions of the Rogue and Applegate 
Rivers, and portions of Louse and Waters Creeks were selected for restudy at a meeting 
attended by representatives of FEMA, Josephine County, the City of Grants Pass, and the 
study contractor on May 25,1988. Results of the hydrologic analyses performed by OTAK, 
Incorporated were coordinated with the COE, USGS, Soil Conservation Service, Oregon 
Department of Land Conservation and Development, and Josephine County. On September 
19, 1990, the results.of the restudy were reviewed at the final community coordination 
meeting attended by representatives of FEMA, the city, and the study contractor. 
Countvwide Update 
An initial community coordination meeting for Josephine County was held on March 6, 
2006. This meeting was attended by representatives of the Cities of Grants Pass and Cave 
Junction, Josephine County, FEMA, and WEST Consultants, Inc. The results of the study 
were reviewed at the final Consultation Coordination Officer [CCO] meeting held on March 
5, 2009, and attended by representatives of the Cities of Cave Junction and Grants Pass, 
Josephine County, The Oregon Department of Land Conservation and Development and 
FEMA. All problems raised at that meeting have been addressed in this study. 
2 
2,0 AREA STUDIED 
2.1 Scope of Study 
This Flood Insurance Study covers the geographic area of Josephine County, Oregon, 
including the incorporated communities listed in Section 1.1. 
The flooding sources studied by detailed methods in unincorporated Josephine County and 
the City of Cave Junction were selected with priority given to all known flood hazards and 
areas of projected development or proposed construction through 1985. Projected 
development or proposed construction were considered through 1995 within the City of 
Grants Pass, 
The limits of detailed studies in Josephine County were determined by FEMA with 
community and study contractor consultation at meetings in January 1978 and May 1988. 
Table 2 lists the flooding sources studied in detail and the included segments. River 
mileages used in this discussion are based on data published by the Hydrology Committee of 
the Columbia Basin Inter-Agency Committee (Reference 2), 
Table 2. Flooding Sources Studied by Detailed Methods 
Limits of Detailed Study 
From its confluence with the Rogue River to approximately 
4,000 feet upstream of Wildcat Gulch near Murphy. 
From a point approximately one mile southwest of Selma (RM 
3.5) to Crooks Creek. 
From SW Rogue River Avenue to approximately 875 feet 
upstream from NW North Hill Drive. 
From the stream gaging station north ofKerby (near RM 50.0) 
to the confluence of the East and West Forks of the Illinois 
River. 
From its confluence with the Illinois River to approximately 
500 feet downstream from Sucker Creek near Cave Junction 
and from Little Elder Creek (RM 65.6) to Page Creek south of 
Takilma. 
From its confluence with the Illinois River to the Redwood 
Highway bridge and from a noint 870 feet downstream from . 
Hugo Road at.O'Brien (RM 7.8) to a point approximately 2.4 
miles further upstream. 
From its confluence with the Rogue River to Monument Drive • 
near Merlin. 
From its confluence with Jumpoff Joe Greek to Granite Hill 
Road. 
From its confluence with the Applegate River to 
approximately 7,000 feet upstream from its mouth. 
Flooding Source 
1. Applegate River 
2. Deer Creek 
3. Gilbert Creek 
4. Illinois River 
5. East Fork 
Illinois River 
6. West Fork 
Illinois River 
7. Jumpoff Joe 
Creek 
8; Louse Creek 
9. Murphy Creek 
3 
Table 2. Flooding Sources Studied by Detailed Methods (continued) 
10. Rogue River 
11. Rogue River 
Right Overbank 
12. Slate Creek 
13. Waters Creek 
From Maple Creek near Galice (RM 75.2) to the Josephine-
Jackson County limits at Savage Rapids Dam.. 
From its confluence with the main stem of the Rogue River to 
its divergence from the main stem of the . Rogue River 
approximately 1,300 feet upstream from Lincoln Avenue. 
From its confluence with the Applegate River to 
approximately the intersection of Round Prairie Road and 
Redwood Highway. 
From its confluence with Slate Creek to approximately 6,200 
feet upstream from its mouth. 
Flows in Skunk Creek and Blue Gulch are well contained in rectified channels or 
underground conduits and were not included in the original study. 
The consultation meetings in January 1978 andMay 1988 further identified flooding sources 
for which the extent of floodway analysis would be limited or excluded. The Rogue River 
floodway was determined only from Pass Creek downstream of Grants Pass to the Josephine-
Jackson County boundary. Hie Louse Creek floodway analysis was terminated at a point 
2,100 feet downstream from the Interstate Highway 5 bridge. The detailed analysis of 
Murphy Creek did not include a floodway analysis. Floodway delineations were considered 
unnecessary in the areas already having multiple. Federal, State, and county permit 
requirements for new construction (such as the area downstream from Pass Creek on the 
Rogue River). 
Approximate analyses were used to study flooding sources in areas having a low 
development potential or minimal flood hazards. The scopes and methods of analysis were 
proposed to, and agreed upon by FEMA, Josephine County , and the Cities of Cave Junction 
and Grants Pass. These analyses wete adopted from previously effective flood hazard 
boundary maps (Reference 3). Table 3 lists the flooding sources, grouped by watershed, 
which were studied by approximate methods. . 
Table 3. Flooding Sources Studied by Approximate Methods 
1. Rogue River, Grave Creek, Wolf Creek, Coyote Creek, Lirnpy Creek, and Dutcher 
Creek. 
2. Jumpoff Joe Creek, Quartz Creek, Bummer Creek, Bannister Creek, Schoolhouse 
Creek, and Hairris Creek. 
3. Slate Creek, Cheney Creek, Murphy Creek, Williams Creek, Banning Creek, and 
the East and West Forks of Williams Creek. 
4. Deer Creek, Clear Creek, Draper Creek, Davis Creek, McMullin Creek, and Crooks 
Creek. 
5. Illinois River, West Fork Illinois River, MendenhalJ Creek, Rough and Ready 
Creek, Elk Creek, East Fork Illinois River, Kelly Greek, Tycer Creek, Sucker Creek, 
Democrat Guleh, Mulvaney Gulch, Althouse Creek, and Althouse Slough. 
4 
2.2 Community Description 
Josephine County is located in southwestern Oregon, sharing its southern boundary with the 
State of California. Established in 1856, the county has an area of 1,625 square miles. 
Residential land development is present throughout the county due to the moderate climate 
and recreational features of the region. The estimated population of the county was 52,100 
in 1978 (Reference 4). The population as of the 2000 census was 75,726 (Reference 5). 
The climate of Josephine County is typical of other areas of Oregon west of the Cascade 
Range. The average July temperature is 71.2°F; in January, the average temperature is 
39.9°F. The Klamath Mountain Range to the west provides a minor orographic barrier to 
winter storms moving inland from the Pacific Ocean. Heavy winter rainfall usually occurs in 
the interior valleys, and deep snow accumulates at the higher elevations of the Cascade, 
Siskiyou, and Klamath Mountain Ranges. The average annual rainfall varies from 
approximately 30 inches in Grants Pass to over 60 inches in the Siskiyou Mountains. The 
Cascade Range, far to the east, accumulates almost 80 inches of precipitation (Reference 6). 
Josephine County is drained almost entirely by the Rogue River and its two principal 
tributaries, the Applegate and Illinois Rivers. Steep, mountainous terrain lends to rapid 
runoff when mild temperatures and heavy rainfall melt snow at the.higher elevations. 
The Rogue River originates in the Cascade Range where the highest elevations exceed 8,000 
feet. The drainage area of the river as it enters Josephine County at Savage Rapids Dam is 
2,430 square miles. As the river flows westerly through the county, flood flows are fairly 
well contained by both banks until reaching the City of Grants Pass, 5.5 miles downstream of 
the dam. From Grants Pass to Finely Bend (9.9 miles west of the city), vast areas of low-
lying terrain are subject to severe flooding. From Finley Bend, the river meanders north of 
Jumpoff Joe Creek (8.5 miles downstream). In these reaches, flood flows are subject to 
natural bank constrictions which result in sizable ponding of water. Beyond Jumpoff Joe 
Creek, the Rogue River flows northwesterly toward the resort community of Galice. In this 
reach, flood flows are totally contained by steep canyon walls, especially at Hellgate Canyon 
and at an unnamed canyon ending at Taylor Creek. In these canyons, flood flows become 
constricted to a few hundred feet in width. Beyond Galice, the river continues its westward 
passage through the Klamath Mountain Range until it eventually reaches the Pacific Ocean, 
The Applegate River originates in the Siskiyou Mountains which form all but the northern 
boundary of the basin. The summit of the range reaches elevations of over 7,000 feet in 
some areas. The river enters Josephine County from the southeast at a point 7.5 miles 
upstream from the small community of Murphy. The drainage area at a discontinued gaging 
station at the bridge in Murphy, is 663 square miles. Flood flows in a sharply meandering 
channel inundate wideportions of the floodplain that lie upstream from natural constrictions. 
Five miles downstream from Murphy, the river passes through a short, narrow eanyon. 
After leaving the canyon, overbarik flooding is moderate until the river becomes affectedby 
backwater from the Redwood Highway (U.S. Highway 199) bridge near Wilderville. Here, 
extensive flooding occurs. Approximately 0.6 miles downstream from the bridge, the 
Applegate River becomes affected by backwater from the Rogue River. The inundated 
Applegate River flood plain width exceeds 4,000 feet at its mouth (6.4 miles west of the City 
of Grants Pass). 
The eastern boundary of the Illinois River basin is also formed by the Siskiyou Mountains. 
The southern and western boundaries are formed by the Che.tco Divide of the Kiamath 
Mountain Range. Summit elevations vary from 4,000 to 6,000 feet. The headwaters of 
Illinois River consist of two principal tributaries, the East and West Forks. Illinois River. The 
5 
East Fork Illinois River enters Josephine County from the south at a point 3,9 miles upstream 
from the community'of Takilma', The drainage area at a gaging station located 0.3 miles 
north of the county limits is 42.3 square miles. General flooding occurs in most areas near 
Takilma except in a gorge east of the community. Farther north, extensive flooding occurs 
in thè wide, flat floòdplain downstream from the Redwood Highway Bridge near Cave 
Junction. The East Fork Illinois River joins the West Fork Illinois River to form the main 
stein of the Illinois River at the City of Cave Junction. 
The West Fork Illinois River also flows northerly into Josephine County at a point 7.1 miles 
upstream from the community of O'Brien. The drainage area of a gaging station located 
approximately 4 miles north of the county limits is 42.4 square miles. The most significant 
flooding in O'Brien occurs at the Redwood Highway Bridge. Overflow inundates portions 
of the community before re-entering the channel downstream from the bridge. Farther north, 
near Cave Junction, flooding is much more severe. Wide areas are inundated, especially near 
the drive-in theater located 2.5 miles south of the community. 
Below the confluence of its East and West Forks, the Illinois River flows northerly through 
fertile agricultural areas. Wide floodplains between Cave Junction and Kerby (2 miles to the 
north) become completely flooded. The flooding north of Kerby is equally severe, eaused in 
part by a sharp bend in the river as it enters a narrow canyon. Beyond the mouth of the 
canyon (2.5 miles north of Kerby), the Illinois River continues westward through the 
Klamath Mountain Range until it meets the Rogue Ri ver at the summer resort community of 
Agness in Curry County, 50.2 miles downstream. 
Deer Creek, a tributary of the Illinois River, is located entirely within Josephine County. The 
creek originates in the Siskiyou Mountain foothills, south of Grants Pass, and flows westerly 
toward the community of Selma. The drainage area of the stream at a point 3.5 miles 
upstream from its mouth is 101 square miles. Flood plains in the Selma area are low and flat. 
Extensive flooding occurs in this agricultural area. 
City of Cave Junction 
The City df Cave Junction is in the southwestern portion of Josephine County. The city, 
surrounded by unincorporated areas of Josephine County ^  is approximately 25 miles 
southwest of Grants Pass, Oregon, and 12 miles north of the Oregon-California State 
boundary. 
Cave Junction, incoiporated in 1948, is the second largest city in thé county, with an 
estimated 1978 population of over 800. Its population as of the 2000 census was 1,363 
(Reference 5). Residential development is present throughout the area due to the moderate 
climate and recreational features of the region. 
The climate of Cave Junction is typical of other areas of Oregon west of the Cascade Range. 
The average July temperature is 71.2°F; in January, 39.3°F. The Klamath Range to the west 
provides a minor orographic barrier to winter storms moving inland from the Pacific Ocean. 
Heavy winter rainfall usually occurs in the interior valleys, and deep snow accumulates at 
higher elevations of the Cascade, Siskiyou, and Klamath Mountain Ranges. (Reference 6). 
City.of Grants Pass 
The City of Grants Pass is situated along the Rogue River in eastern Josephine County 
approximately 25 miles northwest of Medford, Oregon, and 30 miles north of the Oregon-
California State boundary. 
incorporated in 1887, Grants Pass is the county seat and had a population of23,023 as of the 
2000 census. The city extends across a 3-mile-wide valley and is bounded by densely 
wooded hills to the north and south. Fertile lowland areas support a sizable agricultural 
industry; timber and related byproducts are also important to the economy. Seasonal 
recreation fishing and character excursion trips on the Rogue River make Grants Pass a very 
popular tourist center. 
The Rogue River floodplain within the city has areas of dense residential and commercial 
development. Aerial photographs show that some small tracts of land are undeveloped, but 
local land use measures may dictate the type and extent of future development. Gilbert 
Creek has a very high density of residential development. 
The drainage area of the Rogue River at the gage in Grants Pass is 2,459 square miles. The 
river originates in the Cascade Range, where heavily forested slopes reach elevations 
exceeding 8,000 feet. These steep slopes usually accumulate heavy winter snowfall, and 
stonn runoff is rapid when mild temperatures and sustained rainfall occur during the passage 
of a Pacific storm front. An exception to. this general runoff characteristic occurs above an. 
elevation of 5,000 feet in the vicinity of Crater Lake. Highly permeable pumice soils and 
lava formations allow much of the rainfall and snowmelt to infiltrate the ground, thus 
reducing surface runoff (Reference 7). 
The drainage area of.Gilbert Creek is 5.68 square miles at its mouth. The creek originates in 
the foothills north of the city, where the highest elevation is approximately 3,100 feet. The 
channel gradient is very steep until reaching the city, and peak flows usually occur within 
hours after the passage of a storm front. 
Topography varies from the steep, forested slopes of Blue Gulch in the northwestern part of 
the city to the more gently sloping floodplain of the rest of Grants Pass. Elevations range 
from approximately 900 feet along the Rogue River to over 1,500 feet in the northwestern 
portion of the city (Reference 8). 
The average annual temperature is 54°F, with historic extremes ranging from 114°F in 1928 
to -1°F in 1972 (Reference 9). Average annual rainfall varies from approximately 30 inches 
in the vicinity of Grants Pass to almost 80 inches in the extreme northeastern corner of the 
basin near Crater Lake (Reference 6). 
2.3 Principal Flood Problems 
Abnormally heavy or prolonged rainfall, sometimes combined with snowmelt and frozen or 
nearly saturated ground, may cause flooding in Josephine County. 
All streams in Josephine County usually respond to the same storm event, but the 
(quantitative response ean vary considerably. For example, most steams reached record 
stages during the devastating floods of December 1964; peak stages on the Applegate River, 
although high in 1964, were exceeded in January 1974. 
7 
A comparison of historical floods at gaging stations must consider the possibility of changes 
that might occur in the stream channels between storm events. The scouring of a stream 
channel could result in the greater flood having a Lower recorded elevation. 
Flood flows tend to attenuate as they move downstream due toglie lessening qf the channel 
gradient and to the storage of water in the flood plains. Gaging-station records collected in 
the upper part of a basin are, therefore, seldom representative of the runoff characteristics in 
the lower basin. 
The largest flood in recent times occurred on the Rogue River on December 23, 1964. A 
peak flow of 152,000 cubic feet per second (cfs) inundated large residential areas in and 
around the City of Grants Pass. A storm hydrograph at the Grants Pass gaging station 
showed the maximum stage was reached within 2 days after the initial raise in stage, and 
overbank flows remained for almost 4 days after the peak occurred. Antecedent 
climatologi cai conditions were: 90 inches of snow had accumulated at Crater Lake by 
December 21, the freezing level rose to 11,000 feet on December 22, and rainfall totaled 8 to 
10 inches at several reporting stations on December 21 and 22. The Crater Lake snow depth 
decreased to 68 inches by December 23 with a loss of 4 to 5 inehes in water content 
(Reference 10). Downstream from the city to approximately Finley Bend, thousands of acres 
of productive farmland were under as much as 10 feet of water. Severe erosion and siltation 
occurred, and extensive irrigation systems were destroyed. It is estimated that 360 
residences, 19 commercial establishments, and 2 industries were damaged in this area 
(Reference 10). 
Downstream from Finley Bend, the river meanders in and out of deep canyons where 
development consists of ranches, summer homes, and recreational facilities. In December 
1964, it is estimated 70 residences were flooded, and 18 were completely destroyed 
(Reference 10). 
Based on 38 years of records collected at a gaging station in Grants Pass, it is estimated that 
a flood of that magnitude would have occurred on the average of once every 50 years prior to ' 
the construction of Lost Creek Dam. It would now occur oh the average of once every 120 
years with anticipated flood regulation in effect (Reference II). 
In the past 120 years, the December 1964 flood is believed to have been exceeded twice in 
Grants Pass. The U.S. Army Corps of Engineers estimates a flood in December 1861 had a 
discharge of 175,000 cfs; in February 1890, 160,000 cfs (Reference 10). They estimated 
that, due to upstream storage, discharges of that magnitude would now occur on the average 
of once every 180 years and 140 years, respectively (Reference 11), 
Gilbert Creek in Grants Pass is ungaged and quantitative historical high-flow data are 
unknown. Residents living adjacent to the channel have observed road overflow at various 
culverts throughout the city. There is-severe channel encroachment in many areas due, in 
part, to vertical retaining walls built at the edge of the low-water channel. A house on L 
Street spans the channel and will obstruct high flows. 
On the Applegate River, the largest peak recorded at a gaging station located 1.8 miles 
southeast of the Town of Applegate in Jackson County occurred on January 15, 1974. A 
peak discharge of37,200 cfs exceeded the December22,1964 peak of2,500 cfs. Extremely 
unstable channel conditions make an exact comparison of instantaneous peak flows 
impossible, and revisions of previously published data have been necessary. 
Flood damage to agricultural lands was extensive, but most of the damage occurred in areas 
8 
upstream from theTown-of Murphy.-' It is estimated that 2900 acres òfproductive farmland 
were inundated (Reference 12). Most of the residential damage occurred downstream from 
Murphy when the river scoured a sharp bend and inundated almost 200 acres, 
Based on 38 years of data collected at the Applegate gaging station, it is estimated that a 
flood of the magnitude of the 1974 peak would reoccur on the average of once every 20 
years. Now that the Applegate Reservoir is completed, the recurrence interval has been 
lengthened. 
The largest flood on Slate Creek occurred on December 22,1964. A peak flow of4,650 cfs 
was recorded at a gaging station located 3.6 miles upstream from the community of 
Wilderville. Flood damage was not extensive because of the sparse population at that time. 
Based on 19 years of data collected at the gage, a flood of this magnitude would reoccur on 
the average of once every 8 years. 
The largest flood recorded in the Illinois River basin occurred on December 22,1964. Two 
gaging stations located in the upper basin near Takilma and O'Brien indicated unit runoff 
values of approximately 380 cfs per square mile. Instantaneous peak flows were 15,700 cfs 
near Takilma and 16,100 cfs near O'Brien. A gaging station located in the lower part of the 
basin near Kerby had a peak flow of 92,200 cfs and a unit runoff of approximately 240 cfs 
per square mile. The above unit runoff values are the highest ever recorded in Josephine 
County. 
Because of the sparse population at the time, flood damage primarily involved highway 
bridges and agricultural land. Water depths of over 15 feet covered the Redwood Highway 
north of Kerby. Some homes were observed floating away from their foundations during the 
flood. 
Based on 15 years of records collected at the gaging station on Illinois River near Kerby, it is 
estimated a flood of this magnitude would occur on the average of once every 150 years. In 
the upper basin where the flood runoff was more intense, the recurrence interval is estimated 
to be 500 years at Takilma and 300 years at O'Brien. The Takilma gaging station has 39 
years of record; O'Brien, 22 years. 
Extensive flood damage also occurred in the small tributary basins of Josephine County. 
Deer Crede, Jumpoff Joe Creek, and Louse Creek, although ungaged, had the highest flows 
ever observed during the December 1964 storm. Many drainage structures were damaged, 
resulting in the disruption of traffic. Farmland on the narrow terraces of the valleys suffered 
erosion and silt accumu 1 ations. Without streamflow data, it is not possible to derive statistical 
flow data for this flood. 
2.4 Flood Protection Measures 
There are two functioning flood-control reservoirs in the basin. Lost Creek Dam, located 
55.4 miles upstream from the gage in Grants Pass, will reduce, the magnitude of peak-flow ' 
events. It is estimated that a flood of the magnitude of the 1964 Rouge River flood would 
have occurred approximately once every 50 years prior to the construction of Lost Creek 
Dam. It should now occur on the average of approximately once every 120 years with 
existing flood regulation in effect. Due to upstream storage, discharges of the magnitude of 
the 1861 and 1890 Rogue Riyer floods would now occur approximately once every 180 
years and 140 years, respectively (Reference 13). Applegate Reservoir on Applegate River 
9 
is also located in Jackson County, 33.6 miles upstream from the community of Murphy. 
Construction of Elk Creek Dam began in 1986 and ceased in 1988. The completed portion 
of the dam was subsequently breached beginning in July 2008. No flood control isprovided 
by the remaining structure. 
There are no extensive levee systems in the county. Some private interests have constructed 
dikes adjacent to their property; their capability of withstanding sizable flood events is 
unknown. 
ENGINEERING METHODS 
For the flooding sources studied by detailed methods in the community, standard hydrologic and 
hydraulic study methods were used to determine the flood-hazard data required for this study. Flood 
events of a magnitude that are expected to be equaled or exceeded once on the average during any 
10-, 50-, 100-, or 500-year period (recurrence interval) have been selected as haying special 
significance for floodplain management and for flood insurance rates. These events, commonly 
termed the 10-, 50-, 100-, and 500-year floods, have a 10-, 2-, I-, and 0.2-percent chance, 
respectively, of being equaled or exceeded during any year. Although the recurrence interval 
represents the long-term, average period between floods of a specific magnitude, rare floods could 
occur at short intervals or even within the same year. The risk of experiencing a rare flood increases 
when periods greater than 1 year are considered. For example, the risk of having a flood that equals 
or exceeds the 100-year flood (1-percent chance of annual exceedence) in any 50-year period is 
approximately 40 percent (4 in 10); for any 90-year period, the risk increases to approximately 60 
percent (6 in 10). The analyses reported herein reflect flooding potentials based on conditions 
existing in the community at the time of completion of this study. Maps and flood elevations will be 
amended periodically to refleet future changes. 
3.1 Hydrologic Analyses 
Hydrologic analyses were carried out to establish peak discharge-frequency relationships for 
each flooding source studied by detailed methods affecting the community. 
Federal Emergency Management Agency standards require Flood Insurance Studies in 
adjacent areas to use consistent hydrologic analyses. Accordingly, the hydrology of the 
Rogue River in Josephine County is identical to that used in the Jackson County Flood 
Insurance Study (Reference 1). The U.S. Army Corps of Engineers has since revised that 
hydrology (Reference 11) as shown in the following table (discharges are in cfs). 
Discharges 
Flood Event Josephine County Revised Hydrology 
10-percent-annuaI-chance 73,000 70,000 
2-percent-annuaI- chance 128,000 120,000 
1-percent-annual-chance 144,000 153,000 
' 0.2-p ercent-annual-chance 260,000 280,000 
Both sets of data are based on 38 years of stream flow records collected at Grants Pass 
gaging s tation (1939-1976). The discharges are adjusted for expected probability and include 
anticipated flood-control regulation from Lost Creek Dam. The revised values are still within 
the 90 percent confidence limits of the original values. The regulating effect of the proposed 
Elk Creek Dam currently in development by the COE has been evaluated. 
10 
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Construction of Elk Creek Dam.ceased in 1988. The completed portion of the dam was 
subsequently breached beginning in July 2008. No flood control is provided by the 
remaining structure. However, since the regulated discharges, including the anticipated 
benefit of the Elk Creek facility, were found by OTAIC," Inc. to fall within the 90 percent 
confidence interval of the unregulated discharges (i.e., without the Lost Creek and Elk Creek 
facilities), no changes were made to the discharges shown in the Summary of Discharges 
(Table 4). 
The U.S. Army Corps of Engineers also provided concordant flood control from both Lost 
Creek and Applegate Reservoirs. The Applegate River data were based on records collected 
over an 18-year period at a discontinued gaging station near Wilderville. 
The magnitude of the design floods on Slate Creek, and Illinois, East Fork Illinois, and West 
Fork Illinois Rivers was derived by using a log-Pearson Type III probability distribution 
(Reference 14) of the gaging station data referred to in Section 2.3, A generalized skew 
coefficient was determined from U.S. Water Resources Council Bulletin 17 (Reference 15). 
Discharges at sites within 5 to 25 percent of the gaging station drainage area were estimated 
using the following transfer formula: 
Qu = Q g ( A „ / A g ) n 
Where "Qg" and "Ag" are the discharge and drainage area at the gage, "Qu" and "An" are the 
discharge and drainage area at the ungaged location, and the exponent "n" is an exponent 
derived from regional flood-frequency equations published in the U.S. Geological Survey 
Flood-Frequency Analysis for Western Oregon (Reference 16). 
Design floods at all other ungaged sites were determined using the flood-frequency equations 
included in the western Oregon analysis. The 0.2-percent-annual-chance flood equation for 
the Rogue River basin, not included in that report, is: 
QO:002(500) = 1 0 5 A ° ' 9 1 ( S T + 1 ) " U 6 1 1 , 0 4 
Where "A" is drainage area in square miles, "ST" is the area of lakes and ponds (in percent), 
and "I" is the rainfall intensity (2-year, 24-hour) in inches. 
The Gilbert Creek hydrology is based on 25 years of peak-flow data collected at a gaging 
station on Jones Creek, a small basin east of the the City of Grants Pass with headwaters 
adjoining Gilbert Creek. Jones Creek has. a drainage area of 7.41 square miles at a gaging 
station located at the culvert entrance on Interstate Highway 5. The discharges.used in this 
study were computed using a direct drainage area ratio of the two basins even though runoff 
in the urban areas of Gilbert Creek may differ from the rural runoff in the Jones Creek basin. 
If was beyond the scope of this study to conduct a detailed study of the effects ofthe storm-
sewer inflows within the city. 
In order to determine the magnitude of the design floods on Jones Creek, the 25 years of 
peak data were used in a log-Pearson Type III probability distribution, with a generalized 
skew coefficient determined from the U.S. Water Resources Council Bulletin 17 (Reference 
15). The USGS computer program J-407 (Reference 14) detected no low outliers, and the 
discharges were not adjusted for expected probability. 
14 
The Gilbert Creek drainage area was determined on the basis of drainage maps provided by 
tWc City of Grants Pass (Reference 17) and by a USGS topographic map (Reference 8). 
The 1989 OTAK, Inc. analysis computed flows for Lause Creek and Waters Creek using the 
USGS equations in the publication entitled "Magnitude and Frequency of Floods of Western 
Oregon" (Reference 16). The 0.2-percent-annuaI-chance Q equation, describe above, was 
also used. Salt Creek enters Waters Creek approximately one-half mile upstream of Waters 
Creek mouth. The hydrologic analyses for the upper portion of the Applegate River were 
conducted using records from the 42-year period of unregulated flow (i.e., 1939-1980) at the 
USGS gaging station near Applegate (No. 143 66000) and the regulated flow curves provided 
by the COE. The accepted regulated discharges (i.e., regulation due to the Applegate Dam) 
were projected to additional locations of interest upstream of Wildcat Gulch near Murphy 
using the flow transfer formula described above. Peak discharge information was provided 
for the 10-, 2-, 1-, and 0.2-percent-annual-chance floods on the Applegate River, although 
only the 1 -percent-annual chance flood profile was computed. 
Hydraulic Analyses 
Analyses of the hydraulic characteristics of flooding from the sources studied were carried 
out to provide estimates of the elevations of floods of the selected recurrence intervals.Users 
should be aware that flood elevations shown on the Flood Insurance Rate Map (FIRM) 
represent rounded whole-foot elevations and may not exactly reflect the elevations shown on 
the Flood Profiles or in the Floodway Data tables in the FIS report. Flood elevations shown 
on the FIRM are primarily intended for flood insurance rating purposes. For construction 
and/or floodplain management purposes, users are cautioned to use the flood elevation data 
presented in this FIS report in conjunction with the data shown on the FIRM. 
Water-surface elevations were estimated at all cross sections by a computer program that 
computes energy losses between sections, using conservation-of-energy equations (step-
backwater analysis). This hydraulic model requires accurate measurements of channel cross 
sections, bridge and dam geometries, and a proper evaluation of the roughnéss of the main 
channel and floodplains. The water-surface elevations at each cross section were determined 
by using the U.S. Geological Survey computer program E-431 (Reference 18). 
Locations of selected cross sections used in the hydraulic analyses are shown on the Flood 
Profiles (Exhibit 1). For stream segments for which a floodway was computed (Section 4.2); 
selected cross section locations are also shown on the FIRM. 
Channel and cross section properties were determined by photogrammetry based on aerial 
photographs taken September. 30, 1978 (Reference 19). Bridge geometries and the 
underwater portion of the cross sections were surveyed in January 1979. Roughness 
coefficients (Manning's "n") were based on field observation and aerial photographs. The 
range of roughness values used for all floods is shown in Table 5. 
Flood Source 
Applegate River 
Deer Creek 
Gilbert Creek 
Table 5. Range of Manning's Roughness Values 
Main Channel Flood Plain 
0.032-0.042 
0.034-0.045 
0.032-0.055 
0.032-0.080 
Ó.035-0.080 
0.035-0.085 
r 
15 
Table 5. Range of Manning's Roughness Values (continued) 
Illinois River 
canyons near ICerby 
Sours Flat area 
near Pomeroy Dam 
0.038-0.065 
0.045-0.050 
0.038-0.042 
0.050-0.065 
.0.040-0.045 
0.035-0,055 
0.045-0.060 
0.034-0.080 
0.034-0.080 
0 .^034-0.080 
0.034-0.080 
0.034-0.080 
0.035-0.080 
0.050-0.080. 
gravel & roek areas. 
East Fork Illinois River 
West Fork Illinois River 
overflow reach near 
0.035-0.070 0.040-0.080 Lone Mountain Road 
Jumpoff Joe Creek 
Louse Creek 
Murphy Creek 
Rogue River 
through Grants Pass 
Slate Creek 
Waters Creek 
0.032-0.055 
0.033-0.048 
0.045-0,050 
0.030-0.065 
0.031-0.038 
0.032-0.055 
0.030-Ö.070 
0.032-0.100 
0.035-0.080 
0.045-0.080 
0.032-0.09Ó 
0.031-0.200 
0.038-0.150 
0.038-0.110 
The initial water-surface elevations for the flood profiles on the Rogue River were derived 
from a step-backwater convergence study made through a five-section reach ending at cross 
section A (Reference 20), Profile convergence was attained for each of the prescribed flows 
by using the U.S. Geological Survey computer program E-431. 
The computation procedure requires a uniform change in channel conveyance between cross 
sections. Also, in rapidly expanding reaches, the program assumes 50 percent of the energy 
is recovered between sections (due to uncertain eddy losses). Program E-431 became invalid 
at the outlet of two narrow canyons where chute flows and hydraulic jumps occurred (cross 
sections R and AB). Therefore; water-surface profiles through these canyons were 
estimated, and the hydraulic model was reset at the canyon entrances using elevations 
derived by slope-conveyance studies. 
Both Hellgate and Robertson bridges are built well above the 0.2-percent-annual-chance 
flood levels, and neither would constrict the flows. 
The main channel varied from long calm reaches of silt, interlaced with boulders, to the 
bedrock outcrops of Hellgate Canyon. Flood plain vegetation varied from smooth, after-
harvest hop fields to dense, forests. 
The Rogue River floodway analysis began at cross section BU. The initial 1 -percent-annual-
chance flood elevation for the floodway was taken directly from the normal profile computed 
for the cross seetion. Because encroachment was not allowed downstream from cross section 
BU, no surcharge was computed for that cross section. 
The hydraulic analyses of the reach of the Rogue River in Grants Pass began at a point 
approximately 2.3 miles downstream of the city, where the overbank flow breakout returns 
to the channel. Photographs of the 1964 flood revealed that there was divided flow 
downstream of the city. The December 1964 flood discharges in Grants Pass (152,000cfs) 
closely approximated the published 1-percent-annual-chance discharge of 144,000 cfs. This 
16 
discharge resulted in well-defined overflows at the sewage treatment plant and at the 
RogueHa Mobile Home Park. 
The initial hydraulic analyses were conducted to identify the various flow behaviors. Three 
distinct flow patterns occurred: 
1. The 10-percent-annual-chance flow was contained in the channel. 
2. The 2- and 1-percent-annual-chance floods caused overflows on the right bank. 
3. The 0.2-percent-annual-chance flood completely inundated the floodplain. 
An iterative hydraulic analysis for divided flows around the islands was undertaken to 
determine the flow distribution. In order to assess the significance of the overflows, survey 
data were collected to describe the control section over which these overflows would occur. 
These data were subsequently incorporated into the hydraulic model using the HEC-2 
divided flow option. The hydraulic analyses required flow and watcr-surface elevation 
balances between the main stem and the north overbank at three different locations. 
The results of the analysis were then compared with the 1964 flood photographs. It was 
identified that overbank flow returned to the channel at a point located approximately 2.3 
miles downstream of the sewage treatment plant. 
Surveys of typical cross sections for both the channel and the north overbanks were 
conducted and then compared to data used in die existing Flood Insurance Study hydraulic 
model of July 1980. It was determined that the variations between the old cross sections and 
the recently surveyed cross sectio'ns were less then one foot. Therefore the existing cross 
sectional data were retained for profile computations. Water-surface elevations of floods of 
the selected recurrence intervals were computed through use of the COE HEC-2 step-
backwater computer program (Reference 21). 
The 1-percent-annual-chance profile on the.Rogue River agreed favorably with many 1964 
high-water marks found throughout the study area. However, an exact comparison of 
profiles is impossible in the lower reaches because of ungaged tributary inflow during the 
1964 flood.. 
There was a small disagreement on the Rogue River between the computed profile elevations 
and elevations determined from a stage-discharge relation at a gaging station in Grants Pass. 
A minor adjustment was, therefore, prorated from die gage to the Seventh Street bridge, 0.6 
mile downstream. 
The 1989 restudy of the Rogue River analyzed the reach from a point approximately 3.5 
miles downstream of the South 6th Street Bridge in Grants Pass to apoiht 2.2 miles upstream 
of the South 6th Street Bridge. The restudy included the proposed Redwood Highway 
crossing. The hydraulic study was conducted by the Oregon Department of Transportation's 
Hydraulic-Division and was provided by FEMA to OTAK, Inc. 
Hie restudy used discharge values based on the original values used in the Josephine County 
Flood Insurance Study of December U 1981, which included die regulating effect of the 
proposed Elk Creek. Dam, soon to be completed by the COE. The regulated discharges 
include most of the anticipated benefit for the Elk Creek facility and weirs found to fall 
within the 90 percent confidence interval of the unregulated discharges (i.e., without the Lost 
Creek and Elk Creek facilities). The original cross sectional geometry and roughness 
17 
coefficients for the Rogue River restudy were retained from the original modeling for the 
restudy computations. Known elevations from the effective modeling were used for the 
starting water surface elevations of the restudy reach. The selected recurrence intervals were 
computed using of the COE HËC-2 step-backwater computer program (Reference 21). 
Photographs of the 1964 flood of the Rogue River at the City of Grants Pass revealed 
divided flows around the islands located just downstream of thCcity. To determine the flow 
distribution, thé split-flow option of HEC-2 was used. It was identified that the right 
' overbank flow; returned to the channel approximately 2.3 miles downstream of the municipal 
sewage treatment plant. 
The resulting water surface elevations matched within 0.2 feet of those published previously. 
The flood way analysis for the Rogue River restudy was computed using the full 1 -percent-
annual-flood discharge assuming no breakout flows. 
Flood profiles for Gilbert Creek began at the culvert on Rogue River Avenue, the first point 
where energy controls would not be influenced by backwater from the Rogue River. The 
initial water-surface elevations were determined from composite stage-discharge relation 
computed at the culvert entrance. 
A composite stage-discharge relation is a graphic presentation that combines the amount of 
water flowing through the culvert with the amount flowing over the road, then relates the 
total flows to an upstream water-surface elevation. Flows through 23 Gilbert Creek culverts 
were computed using USGS computer programs E-431 and A-526 (Reference 18 and 22). 
Most road overflow situations involved flat street surfaces where flow direction was difficult 
to determine. Where unconfined overflow occurred, the effective width was based on either 
the upstream channel geometry or the location of houses and garages in the approach section. 
In all cases, the amount of road overflow was computed using coefficients published in the 
USGS Techniques of Water-Resources Investigations (Reference 23). 
Storm-sewer inflows were estimated at West B Street and at Hillcrest Drive using outlet pipe 
diameters and by assuming the pipe gradient was equal to the ground slope to the nearest 
manhole structure. Resultant discharges were derived from the Manning equation for pipe 
flow as given in King's Handbook of Hydraulics (Reference 24). 
Both Gilbert Creek and Jones Creek have a trans-basin irrigation canal iii the upper basin. 
The Tokay Canal diversion from the Rogue River is at a pumping station at Savage Rapids 
Dam, located 6.1 miles, upstream from the Grants Pass gaging station. The canal 
contribution to flood flows is uncertain because some flows can enter the basin as spillage 
from the; canal. The ditch capacity at the pumping plant is 47 cfs, but the capacity upstream 
from Hawthorne Avenue is only 27 cfs. This study assumes ditch flows are negligible 
during peak events. 
Flood profiles were drawn showing computed water-surface elevations to an accuracy of 0.5 
foot for floods of the selected recurrence intervals (Exhibit 1). 
Initial water-surface elevations for the profiles on Jumpoff Joe Creek reflected concordant 
flows of the Rogue River. The 1 -percent-annual-chance flood elevations on Rogue River 
extended 2.2 miles up the Jumpoff Joe Creek channel. The initial water-surface elevation 
used for the floodway analysis was estimated from a slope-conveyance study that did not 
consider concordant flow or backwater. The Jumpoff Joe Creek profiles continued 
uninterrupted pasttheconfluenceofLouse Creek inMerlin. An increase in channel gradient 
18 
upstream from Merlin made it necessary to establish additional crosssectidtis. These cross 
sections were estimated by interpolating between the geometries of the two nearest cross 
sections, and by using a map having 4 foot contour intervals (Reference 19). 
Supercritical flow situations were encountered at three cross sections. Each situation 
required a resetting of the model using critical-depth elevations for each of the prescribed 
flows. . - ' 
At Russell Road, the 0.2-percent-annual-chance flood overflowed the highway at a point 800 
feet south of the bridge. A composite flow situation could not be computed because the flow 
in the main channel and flow in the overflow section did not share a common headwater 
elevation. Road overflow was estimated. 
The main channel consisted of gravel and small boulders and the overbank areas varied from 
pastures to dense forests. 
The initial water-surface elevations for profiles on Louse Creek were headwater elevations 
computed for the railroad bridge in Merlin.- The headwater elevations were manually 
computed from a critical-depth section at the outlet of the bridge. Exact discharge values 
could not be determined because of unknown inflow from Harris Creek, a large tributary 
with a bridge 450 feet north of the Louse Creek channel. There is an exchange of flow 
between the two channels via a large ditch at the toe of the railroad embankment. An 
apportionment of flow through each structure could not be made because there is no common 
headwater elevation due to the lateral slope of the terrain. For the purpose of this study, it 
was assumed no peak flow exchange occurs during flooding. 
The 1-percent-annual-chance flood on Louse Creek was found to be contained within the 
main channel except at the railroad bridge in Merlin and at a bridge on Monument Drive. A 
portion of the Louse Creek floodplain, downstream of Monument Drive, was found to be 
susceptible to 1-percent-annual-chance sheet flow, a condition of overland flow where 
elevations and directions of flow are difficult to determine. Small embayments at the mouths 
of tributaries also wouid experience flooding. A flood way was designed to occupy the entire 
width of the 1 -percent-annual-chance floodplain because any encroachment on the main 
channel would increase the stream velocities and aggravate bank erosion. Supercritical flow 
occurred at 18. cross sections in this reach. 
Because of the steep channel gradient, 21 additional cross sections were needed to define a 
continuous profile. The additional cross sections were estimated as described in the Jumpoff 
Joe Creek discussion. 
Approximately 30 percent of the 1-percent-annual-chance flood flow on Louse Creek 
bypasses the bridge at Monument Drive at a point 600 feet north of the channel. The flow 
capacity of the bridge would not allow any encroachment on the flood plain, and a floodway 
analysis was not attempted. 
The channel consisted of gravel and cobbles, with some overhanging brush, and overbank 
values ranged from pasture grass to dense forest. 
The. 1989 study by OTAK, Inc. extended the portion of detailed study for Louse Creek by 
adding a reach extending from approximately 470 feet downstream of Monument Drive 
upstream to its crossing of Granite Hill Road, a distance of 2.9 miles. The starting water 
19 
surface elevation for the extended reach was based on known elevations from'the effective 
modeling. Channel and cross section properties were surveyed between February and June 
of 1989. Water-surface elevations of floods of the selected recurrence intervals were 
computed through use of the COEHEC-2steip-backwater computer program (Reference 21). 
The average fall of Louse Creek throughout the study reach was approximately 90 feet per 
mile. This steep slope resulted in many supercritical flow conditions even though surveyed 
cross sections were taken at an Average interval of 600 feet along the creek. Because of the 
steep channel gradient; 24 additional cross sections were added to the hydraulic model. 
Overall, the 1 -percent-annual-chance floodplain width on the upper Louse Creek varied from 
50 feet to 1,000 feet. 
Because of the steep channel gradient for Louse Creek, the equal conveyance encroachment 
option that operates on the energy gradeline was used for the floodway analysis. This 
method is suggested for steep waterways since it will not allow unreasonable encroachments. 
The resulting floodway widths varied from 30 feet to 230 feet. 
The flood profiles for Applegate River began at its confluence with the Rogue River. Initial 
water-surface elevations were based on concordant flows where backwater extended 1,180 
feet up the Applegate River channel. The initial water-surface elevation for the floodway 
analysis was determined from a stage-discharge relation established at cross section BZ on 
Rogue River and does not consider concordant flow or backwater. 
A natural constriction at cross section Z caused a supercritical flow situation for the 0.2-
percent-annual-chance flood. The change in the state of flow eaused an unrealistic shape in 
the stage-discharge relation, and the 0.2-percent-annual-chance elevation was, therefore, 
estimated by extrapolating the rating curve. 
Supercritical flows were also encountered at a low diversion dam at the mouth of Murphy 
Creek. The hydraulic model was reset using elevations derived by critical-depth 
computations. A direct weir formula could not be used because of excessive bypass flow 
around the ends of the dam. 
The bed material of Applegate River varies from areas of unstable gravel and rock deposits 
to bedrock outcrops overlain by boulders and gravel. Much of the reach is subject to change 
due to scour and filling of bed material and to gravel mining, Floodplain vegetation varied 
from pasture grass to dense deciduous brush, On the south bank at cross section AE, an 
upstream bank projection would cause a portion of the cross section to become ineffective 
for transmitting flows due tp a large eddy current. An unrealistically high "n" value was 
therefore assigned to reduce the conveyance in that portion of the cross section. 
The 1989 OTAK, Inc. analysis extended the Applegate River study from the previous 
upstream limit of detailed study to the Josephine-Jackson County line, an addition of 
approximately 5.6 miles. Known water surface elevations from the effective modeling were 
used as the downstream boundary for the extended modeling. Cross section properties were 
surveyed between Februaiy and June of 1989. Water-surface elevations of floods of the 
selected recurrence intervals were computed through use of the COE HEC-2 step-backwater 
computer program (Reference 21). No floodway was computed as a part of the 1989 
analysis due to the lack of development pressure. 
The average fall of the Applegate River throughout the 1989 study area was approximately 
17 feet per mile. With surveyed cross sections taken at an average interval of one every 
3,000 feet, many critical depth statements were encountered during the initial hydraulic 
20 
simulations. This problem was solved by using the interpolated cross sections option of the 
IIEC-2 model. Approximately 21 cross sections were automatically inserted by the 
hydraulic model throughout this reach of the Applegate. Overall, the 1-percent-annual-
chance floodplain width on the limited detail study portion of the Applegate varied from 
1,200.feet to 2,700 fèet. " ' ' 
Initial water-surface elevations for profiles on Slate Creek reflect concordant flows of 
Applegate River. Backwater extended 5,500 feet up the Slate Creek channel. The initial 
elevation for the Slate Creek floodway analysis was determined by a slope-conveyance study 
through the first five cross sections of the reach (to cross section C). Concordant flow with 
backwater was not a consideration for the floodway analysis. Main channel bed material 
consisted of areas of rock and gravel deposits interlaced with boulders. The upper reach 
consisted of bedrock outcrops and boulders. Floodplain vegetation varied from moderate to 
extremely dense brush and tree growth. 
Waters Creek, a small tributary to Slate Creek, was studied by OTAK, Inc. in 1989 from its 
confluence with Slate Creek upstream for a length of approximately 1 mile. The starting 
water-surface elevation was computed using the slope-area method. The backwater 
elevations from Slate Creek at the confluence were computed based on a normal depth 
approximation for Slate Creek using a discharge computed from the flow/area transfer 
formula (Reference 16). The Waters Creek confluence is located approximately 3 miles 
upstream of the confluence of Hound Prairie Creek. Channel and cross section properties 
were surveyed between February and June of 1989. Water-surface elevations of floods of 
the selected recurrence intervals were computed through use of the COE HEC-2 step-
backwater computer program (Reference 21). The average fall of Waters Creek throughout 
the study reach was approximately 50 feet per mile. This steep slope resulted in many 
supercritical flow conditions, even though surveyed cross sections were taken at an average 
interval of 300 feet along the creek. Because of the steep channel gradient, 17 additional 
cross sections were added to the hydraulic model. Overall, the 1-percent-annual-chance 
floodplain varied from 80 feet to 420 feet. 
Because of the steep channel gradient for Waters Creek, the equal conveyancc encroachment 
option that operates on the energy gradeline was used for the floodway analysis. This 
method is suggested for steep waterways since it will not allow unreasonable encroachments. 
The resulting floodway widths varied from 30 feet to 100 feet. 
Initial elevations for the. design-flood profiles for Murphy Creek were determined from a 
slope-conveyance study in the lower reach where all but the 0.2-percent-annual-chance flood 
were well contained in a rectified channel. A floodway analysis was not required on Muiphy 
Creek. Headwater elevations at the Southside Road bridge were computed using the U.S 
Geological Survey computer program A-526 (Reference 22). Supercritical flows were 
encountered at two cross sections (E and I), and the model was reset using critical-depth 
elevations at each cross section. The.0.2-percent-annual-chance flood overflows Southside 
Road near the intersection of Williams Highway. Bypass flows then merge with Applegate 
River and do not re-enter the Murphy Creek channel. Thè extent of road overflow was 
estimated because a composite stage-discharge relation could not be established at the 
bridge. 
Murphy Creek main-channel bed material consisted of loose rocks and boulders, and 
floodplain vegetation consisted of areas of unimproved pasturelànd, and moderate to dense 
brush and tree growth. 
21 
The flood profiles for the Illinois River began at a point 300 feet downstream from a gaging 
station near Kerby (No. 14377100). The stage-discharge relation developed at the gage was 
used to determine initial elevations. The velocity distribution in a vast pondiiig of water at 
Sauers Flat, upstream from the gage, is uncertain due to eddy currents and slack water. The 
limits of the effective velocities were then estimated until upstream.profile elevations agreed 
with a stage-discharge relation established at a discontinued gaging station (No. 1437000) 
located at the Finch Road bridge in Kerby, 3.6 miles upstream from the.initial cross section. 
A low diversion dam near Cave Junction (Poineroy Dam) was completely submerged by all 
flows and did not affect profile elevations. As previously mentioned, the computation of 
flood profiles continued uninterrupted up East Fork Illinois River to Sucker Creek. As the 
Illinois and East Fork Illinois Rivers were treated as essentially one river, cross section 
locations on the East Fork Illinois River refer to the starting point of the profiles, Illinois 
River Mile 50.0, approximately 6.4 miles downstream from the conflucnce of the Illinois, 
East Fork Illinois, and West Fork Illinois Rivers. 
Cross section data for Illinois and East Fork Illinois Rivers were obtained from 
photogrammetry based on aerial photographs taken on September 30,1978 (Reference 19). 
Bridge geometry and underwater portions of the cross sections were surveyed in January 
1979. 
There was a wide range in main-channel bed material throughout this study reach. In the 
canyon area north of Kerby, bed material consisted of boulders and bedrock outcrops. In the 
ponded reaches of Souers Flat, bed material consisted of soft bottom material with brushy 
banks. 
' Floodplain vegetation consisted of pastureland grass, cultivated farm lands (oftenbare during 
flood season), moderate to heavy brush and tree growth, and dense, deciduous brush and tree 
growth. 
Effective velocities at Sauers Flat were estimated by assigning high "n" values to reduce the 
conveyance in thenoncontributing areas of the floodplain. This technique was also used on 
East Fork Illinois River, upstream from the Redwood Highway. Extensive areas of shallow 
flooding were judged noncontributing because of the bank configuration upstream from 
eross sections M and N. . 
Initial water-surface elevations for the second segment of the East Fork Illinois River were 
determined by using the converging profile technique through five cross sections ending at 
cross section A. The effective channel at cross sections A and B was adjusted to exclude the 
embayment at the mouth of Little Elder Creek. 
Supercritical flows were encountered at a narrow canyon near cross section J. The hydraulic 
model was reset using a critical depth elevation, and the profiles continued uninterrupted 
through the remainder of the reach. 
Bed material in the commonly braided main channel consisted of large areas of unstable rock 
and gravel deposits. There are bedrock outcroppings and large, rounded boulders in the 
narrow confines of the canyons, but, generally, the entire reach appears subject to 
considerable movement of bed material. Flood plain vegetation consisted of some areas of 
pastureland, but moderate to heavy brush and trees predominated. 
22 
Flood profiles for the first segment of the West Fork Illinois River began at its mouth and 
reflect concordant flow conditions from the main stem of the Illinois River. Backwater from 
a 1 -percent-annual-Chance flood would extend 4,460 feet lip the West Fork Illinois River 
channel. The initïâfconcordant flow (or backwater) and was derived by modeling the base 
flood from Pomeroy Dam to the initial section at the mouth. 
The effective velocities at the west bank of cross section J were uncertain due to the 
configuration of the upstream channel. The cross section width was therefore arbitrarily 
reduced to exclude an eddy flow situation. 
The main-channel bed material consisted of large areas of irregular bedrock outcropping 
overlain in places by loose sand and gravel deposits. Wide gravel bars are evident where the 
low-water channel is deeply entrenched near one of the banks. Flood plain vegetation 
consisted of moderate to dense brush and tree growth. 
Initial water-surface elevations for the second segment of the West Fork Illinois River 
profiles were derived by a convergence run through a reach (five cross sections) ending at 
cross section A. Flow was tranquil throughout the reach; the only problem encountered was 
a bypass-flow situation at the Redwood Highway bridge in O'Brien. 
The low north bank of the ehannel upstream from the bridge allows water to flow toward the 
intersection of Lone Mountain Road and Redwood Highway, located 1,800 feet north of the 
channel. It is possible that some of the water overflows the intersection and bypasses the 
entire reaeh downstream from the bridge. 
For. the purpose of this study, it was assumed that the entire road overflow was limited to 850 
feet of roadway immediately north of the bridge. This limitation was based on the position 
of the upstream berm which contains all flow at the approach cross section (cross section L). 
Main channel bed material consisted of gravel bars at sharp channel curvatures, bedrock 
outcrops that formed deep low-flow pools and boulder-strewn reaches that appear unstable. 
Floodplâin vegetation varied from pastureland grass to areas of dense brush and trees. 
The initial elevations for the flood profiles on Deer Creek were estimated by a convergence 
run through a reach with six cross sections ending at cross section A. 
McMullin and Thompson Greeks are tributaries that parallel Deer Creek throughout much of 
the central portion of this study reach. Although there is an exchange of peak flows near 
cross section R, it was assumed most inflow occurred at cross section P. 
Main channel bed material consisted of sizable areas of rock and gravel deposits which are 
subject to considerable movement during flood stages. Floodplain vegetation varied from 
pasture grass to dense brush and tree growth. Large acreages of cultivated farmland also 
occupy the floodplains. 
Flood profiles were drawn showing computed water-surfacé elevations to an accuracy of 0.5 
foot for floods of the selected recurrence intervals (Exhibit 1). 
The hydraulic analysés for this study were based on unobstructed flow conditions. The flood 
elevations, thus derived are considered valid only if there are no significant changes made to 
the existing drainage structures or to other physical features of die channels (such as changes 
23 
in alignment and vegetation). 
3.3 Vertical Datum " "" 
All F1S reports and FIRMS are referenced to a specific vertical datum.. The vertical datum 
provides a starting point against which flood, ground, and structure elevations can be 
referenced and compared. Until recently, thestandard vertical datum used for newly created 
or revised FIS reports and FIRMs was the National Geodetic Vertical Datum of 1929 
(NGVD 29). With the completion of the North American Vertical Datum of 1988 (NAVD 
88), many FIS reports and FIRMs are now prepared using ÑÁVD 88 as the referenced 
vertical datum. 
Flood elevations shown in this FIS report and on the FIRMs are referenced to NAVD 88. 
These flood elevations must be compared to structure and ground elevations referenced to 
the same vertical datum. For information regarding conversion between the NGVD and the 
NAVD, visit the National Geodetic Survey website at www.ngs.noaa.gov, or contact the 
National Geodetic Survey at the following address: 
NGS Information Services 
NOAA, N/NGS12 
National Geodetic Survey 
' SSMC-3, #9202 
1315 East-West Highway 
Silver Spring, Maryland 20910-3282 
(301)713-3242 
(301) 713-4172 (fax) 
The conversion factor from NGVD to NAVD for all flooding sources in this report is +3.36 
feet. 
Temporaiy vertical monuments are often established during the preparation of a flood hazard 
analysis for the purpose of establishing local vertical control. Although these monuments are 
not shown on the FIRM, they may be found in the Technical Support Data Notebook 
associated with the FIS report and the FIRMs for this community. Interested individuals 
may contact FÉMA to access these data. 
To obtain current elevation, description and/or location information for benchmarks shown 
on the FIRMs, please contact information services Branch of the NGS at (301) 713-3242, or 
visit their website at www.ngs.noaa.gov. 
FLOODPLAIN MANAGEMENT APPLICATIONS 
TheNFIP encourages State and local governments to adopt sound floodplainmanagement programs. 
To assist in this endeavor, each FIS report provides 1-percent annual-chance floodplain data, which 
may include a combination of the following: 10-, 2-, l- , and 0.2-percent-annual-chance flood 
elevations; delineations of the 1 -percent-annual-chance and 0.2-percent-annual-chance floodplains; 
and I-percent-annual-chance floodway. This information is presented on the FIRM and in many 
components of the FIS report, including Flood Profiles, Floodway Data tables sind Summary of 
Stillwater Elevation tables. Users should reference the data presented in the FIS report as well as 
24 
additional information that may be available at the local Community map repository before making 
flood elevation and/or floodplain boundary determinations. 
4.1 Floodplain Boundaries 
To provide a national standard without regional discrimination, the 1-percent annual chance 
(100-year) flood has been adopted by FEMA as the base flood for floodplain management 
purposes. The 0.2-percent-annual-chance (500-year) flood is employed to indicate additional 
areas of flood risk in the community. For each stream studied by detailed methods, the 1-
and 0.2-percent-annual-ehance floodplain boundaries have been delineated using the flood 
elevations determined at each cross section. Between cross sections, the boundaries were 
interpolated using topographic maps at scales of 1:2,400, 1: 4,800, and 1:62,500, with 
contour intervals of 2 ,4 , and 80 feet, respectively (References 8, 17, and 19). 
Gilbert Creek boundaries were determined on the basis of random topographic elevations 
taken during the field surveys. They may, therefore, not show local variations of either 
higher or lower terrain between points of definition. 
For streams studied by approximate methods, the boundary of the 1-percent-annual-chance 
flood were taken from the Flood Hazard Boundary Map (Reference 3). 
The 1- and 0.2-percent-annual-chance floodplain boundaries are shown on the Flood 
Insurance Rate Map. On this map, the 1-percent-annual-chance floodplain boundary 
corresponds to the boundary of the areas of special flood hazards (Zones A and AE), and the 
. 0.2-percent-annual-chance floodplain boundary corresponds to the boundary of areas of 
moderate flood hazards. In cases where the 1- and 0.2-percent-annual-chance floodplain 
boundaries are close together, only the 1-percent-annual-chance floodplain boundary has 
been shown: Small areas within the floodplain boundaries may lie above the flood 
elevations but cannot be shown due to limitations of the map scale atid/or lack of detailed, 
topographic data. 
For the streams studied by approximate methods, only the 1-percent-annual-chance 
floodplain boundary is shown on the Flood Insurance Rate Map. 
Countywide Update 
As part of the countywide update, floodplain boundaries were digitized from the effective 
FIRM and Floodway panels. USGS topographic maps (Reference 25) and aerial 
photography (Reference 26) were used to adjust floodplain and floodway boundaries where 
appropriate. 
The 1- and 0.2-percent-annual-chance floods were redelineated on Gilbert Creek and 
portions of the Rogue River using new topography with a one-foot contour interval provided 
by the City of Grants Pass (Reference 27). The cross section locations were digitized from 
the effective Floodway panels or work maps. Elevations used for the redelineation were 
taken from the effective floodway data tables and adjusted to the NAVD88 vertical datum. 
The redelineation along Gilbert Creek extended from SW Rogue River Avenue to just 
upstream of NW Windsor Drive, a distance of approximately 2.5 miles. Redelineation along 
the Rogue River extended from approximately river station 111,810 (cross section CD) to 
river station 158,250 (cross section D J). 
25 
In accordance with FEMA Procedure Memorandum 36 (Reference 28), profile baselines 
have been included in all areas of detailed study. Profile baselines are shown in the location 
of the original stream centerline or original profile baseline without regard to the adjusted 
floodplain position on the new base map. This was done to maintain the relationship of 
distances between cross sections along the profile baseline between the hydraulic models, 
flood profiles and floodway data tables. 
Floodways 
Encroachment on floodplains, such as structures and fill, reduces flood-carrying capacity, 
increases flood heights and velocities, and increases flood hazards in areas beyond the 
encroachment itself. One aspect of floodplain management involves balancing the economic 
gain from floodplain development against the resulting increase in flood hazard. For 
purposes of the NFIP, a floodway is used as a tool to assist local communities in this aspect 
of floodplain management. Under this concept, the area of the 1-percent-annual-chance 
floodplain is divided into a floodway and a floodway fringe. The floodway is the channel of 
a stream, plus any adjacent floodplain areas, that must be kept free of encroachment so that 
the 1-percent-annual-chance flood can be carried without substantial increases in flood 
heights. Minimum Federal standards limit such increases to 1 foot, provided that hazardous 
velocities are not produced. The iloodways in this study are presented to local agencies as 
minimum standards that can be adopted directly or that can be used as a basis for additional 
floodway studies. 
The iloodways presented in this study were computed for certain stream segments on the 
basis of equal-conveyance reduction from each side of the floodplain. Floodway widths 
were computed at cross sections, Between cross sections^ the floodway boundaries were 
interpolated. The results of the floodway computations are tabulated for selected cross 
sections (see Table 6). In cases where the floodway and 1-percent-annual-chanee floodplain 
boundaries are either close together or collinear, only the floodway boundary is shown. 
For the purpose of developing the 1-percent-annual-chance floodway for the Rogue River, 
all of the flow was assumed to be confined to the main stem channel and its immediately 
adjacent overbank. 
As agreed upon by county representatives and FEMA, the computation of iloodways on the 
Rogue River, downstream of Pass Creek, on Murphy Creek, and on Gilbert Creek were not a 
requirement of this study. 
The area between the floodway and 1-percent-annual-chance floodplam boundaries is termed 
the floodway fringe. The floodway fringe encompasses the portion of the floodplain that 
could be "completely obstructed without increasing the water-surface elevation of the 1-
percent-annual-chance flood more than 1 foot at any point. Typical relationships between 
the floodway and the floodway fringe and their significance to floodplain development are 
shown in Figure 1. 
26 
1-PefiCÉNT-AAINUÂL-CHANCE RGQOPUMN 
AffiÂOf FUOOOPLAIN THATCOUÜ> SÉ UtfO fOR 
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TABLE 6 
' 
FL
O
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 D
A
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JU
M
PO
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 J
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C
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1-
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N
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A
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(F
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01 o o 
d o d o 
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O
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A
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JU
M
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1-
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A
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Fe
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 A
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O
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W
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A
TA
 
JU
M
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 J
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C
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1-
P
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A
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S
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W
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FL
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1  
Fe
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FL
O
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A
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JU
M
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1-
P
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A
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C
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JU
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M
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VE
LO
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(F
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(S
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65
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60
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46
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O
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JU
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f E 
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(c
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TABLE 6 
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TABLE 6 
FL
O
O
D
W
A
Y
 D
A
T
A
 
| 
LO
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SE
 C
R
EE
K
 
1-
P
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C
E
N
T-
A
N
N
U
A
L-
C
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S
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(F
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i 
q o o q q q o q q q q q q q q O T - < 0 < \ | o o o ^ q q 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
FL
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| 
LO
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1-
P
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A
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S
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FL
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(F
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N
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1.
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4 
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7 
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4.
1 
1,
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3 
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1.
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1.
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5.
9 
1,
11
1.
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1.
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7.
8 
1.
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5.
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8.
5 
1,
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2.
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1.
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7.
9 
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5 
1.
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5.
5 
1.
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4.
6 
1  
Fe
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 A
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Jo
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C
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FL
O
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D
W
A
Y
 D
A
T
A
 
| 
LO
U
SE
 C
R
EE
K
 
1-
P
E
R
C
E
N
T-
A
N
N
U
A
L-
C
H
A
N
C
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 F
LO
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D
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A
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S
U
R
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A
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W
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FL
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(F
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4 
1,
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1.
8 
1.
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5.
8 
1,
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9.
7 
1.
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4.
1 
1,
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0.
4 
1.
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6.
3 
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1,
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1.
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2 
1.
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4 
1,
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9.
0 
1.
10
5.
9 
1,
11
1.
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1,
11
7.
7 
1,
12
4.
7 
1.
12
8.
3 
1,
13
2.
0 
1,
13
7.
9 
1,
13
9.
9 
1.
14
2.
4 
1.
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5.
5 
1.
15
4.
6 
1  
Fe
et
 A
bo
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flu
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 J
um
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Jo
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C
re
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FL
O
O
D
W
A
Y
 D
A
T
A
 
| 
LO
U
SE
 C
R
EE
K
 
1-
P
E
R
C
E
N
T-
A
N
N
U
A
L-
C
H
A
N
C
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 F
LO
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D
 W
A
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S
U
R
FA
C
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LE
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R
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(F
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N
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1,
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1,
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4.
4 
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1.
8 
1.
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5.
8 
1,
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9.
7 
1.
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4.
1 
1,
07
0.
4 
1.
07
6.
3 
1,
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1.
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1,
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5,
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1.
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0.
2 
1.
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4.
4 
1,
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9.
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1.
10
5.
9 
1,
11
1.
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1,
11
7.
7 
1,
12
4.
7 
1.
12
8.
3 
i 
1,
13
2.
0 
1,
13
7.
9 
1,
13
9.
9 
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2.
4 
1.
14
5.
5 
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1,
15
4.
6 
1  
Fe
et
 A
bo
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 C
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flu
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 J
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Jo
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C
re
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FL
O
O
D
W
A
Y
 D
A
T
A
 
| 
LO
U
SE
 C
R
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K
 
FL
O
O
D
W
A
Y
 
M
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N
 
VE
LO
C
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(F
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SE
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7.
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10
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9.
4 
10
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9.
4 
10
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7.
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9.
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6.
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10
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8.
7 
11
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7.
6 
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8.
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7.
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11
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7.
8 
9.
9 
9.
1 
11
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13
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10
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8.
8 
11
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1  
Fe
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 A
bo
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 C
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flu
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 w
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 J
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po
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Jo
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C
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FL
O
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D
W
A
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 D
A
T
A
 
| 
LO
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 C
R
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FL
O
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W
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. 
SE
C
TI
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N
 A
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(S
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60
0 
40
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44
6 
39
3 
45
0 
41
0 
58
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44
3 
55
0 
32
4 
40
7 
31
0 
46
3 
33
5 
44
0 
48
1 
31
7 
45
2 
35
8 
, 3
87
 
29
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25
4 
33
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40
3 
29
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1  
Fe
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 A
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FL
O
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W
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 D
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| 
LO
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 C
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FL
O
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W
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' 
(F
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1  
Fe
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 A
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 C
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Jo
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C
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FE
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M
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A
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Hi 
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13
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14
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14
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14
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15
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15
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16
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16
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17
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17
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18
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18
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19
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19
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20
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. 
20
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20
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21
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21
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21
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21
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22
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1  
Fe
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 A
bo
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 C
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flu
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 J
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Jo
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C
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FE
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A
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TABLES 
INSURANCE APPLICATION 
For flood insurance rating purposes, flood insurance zone designations are assigned to the community 
based on the results of the engineering analyses. These zones are as follows: 
Zone A 
Zone A is the flood insurance rate zone that corresponds to the 1-percent-annual-chance floodplains 
that are determined in the Flood Insurance Study by approximate methods. Because detailed 
hydraulic analyses are not performed for such areas, no base (I-percent-annual-chance) flood 
elevations (BFEs) or depths are shown within this zone. 
Zone AE 
Zone AE is the flood insurance rate zone that corresponds to the 1-percent-annual-chance floodplains 
that are determined in the Flood Insurance Study by detailed methods. Whole-foot BFEs derived 
from the detailed hydraulic analyses are shown at selected intervals within this zone. 
Zone X 
Zone X is the flood insurance rate zone that corresponds to areas outside the 0.2-percent-annual-
chance floodplain, areas within the0.2-percent-annual-chancefloodplain, areas of 1 -percent-annual-
chance flooding where average depths are less than 1 foot, areas of 1 -percent-annual-chance flooding 
where the contributing drainage area is less than 1 square mile, and areas protected from the 1-
percent-annual-chance flood by levees. No BFEs or depths are shown within this zone. 
Zone D 
Zone D is the flood insurance rate zone that corresponds to unstudied areas where flood hazards are 
undetermined, but possible. 
Table 7 lists the flood insurance zones that each community is responsible for regulating. 
Table 7. Flood Insurance Zones Within Each Community 
Community Flood Zonei s) 
Cave Junction, City of AE, X 
Grants Pass, City of AE, X 
Josephine County, Unincoiporated Areas A, AE, X, D 
FLOOD INSURANCE RATE MAP 
The Flood Insurance Rate Map is designed for flood insurance and floodplain management 
applications. 
For flood insurance applications, the map designates flood insurance rate zones as described in 
Section 5.0 and, in the 1-percent-annual-chance floodplains that were studied by detailed methods, 
shows selected whole-foot BFEs or average depths. Insurance agents use the zones and BFEs in 
conjunction with information on structures and their contents to assign premium rates for flood 
insurance policies. 
47 
For floodplain management applications, the map shows by tints, screens, and symbols, the 1- and 
0.2-percent-annuaI-chance floodplains floodplains, floodways, and the locations of selected cross 
sections used in the hydraulic analyses and floodway computations. 
The countywide Flood Insurance Rate Map presents flooding information for the entire geographic 
area of Josephine County. Previously, Flood Insurance Rate Maps were prepared for each 
incorporated community and the unincorporated areas of the County identified as flood-prone. This 
countywide Flood Insurance Rate Map also includes flood-hazard information that was presented 
separately on Flood Boundary and Floodway Maps, where applicable. Historical data relating to the 
maps prepared for each community are presented in Table 8, "Community Map History." 
OTHER STUDIES 
In December 1965, the U.S Army Corps of Engineers published a Flood Plain Information report 
which described the flooding in Josephine County during the 1964 flood (Reference 29). Flood 
boundaries for the 1964 flood, and estimated boundaries for the 1861 flood were shown on aerial 
photographs. No profiles .were presented. 
In July 1966, the U.S. Army Corps of Engineers published a statewide Post Flood Report describing 
the floods that had occurred in December 1964 and January 1965 (Reference 10). A discussion of 
flooding from streams within Josephine County included graphic displays of cumulative precipitation 
and storm hydrographs. 
In November 1970, USGS published a profile study for the Rogue River in a reach extending from 
the Grants Pass gaging station to the Lost Creek for the 1964 flood and for the 10- and 20-year 
floods, based on hydrology considered to be effective at that time. Also presented were cross 
sections and channel plan views. Profile concurrence for the design floods was not attempted 
because of significant changes in the hydrologic analyses due to revised flood-control estimates. 
Also present were cross sections and channel plan views. Profile concurrence for the design floods 
was not attempted because of significant changes in the hydrologic analyses due to revised flood-
control estimates. 
In July 1971, the U.S. Geological Survey prepared a Flood Insurance Study for Josephine County 
(Reference 30). The report presented base flood elevations and estimated flood boundaries which 
were shown on enlarged portions of 10-minute quadrangles having 80-foot contour intervals. Flood 
profiles for the 500-, 100-, and 10-year floods were based on the same hydrology used, in the 
previously described Profile Study (Reference 31). The Type-10 study did not include the 
incorporated area of Grants Pass. 
In July 1975, the U.S. Army Corps of Engineers published a statewide Post Flood Report describing 
floods that had occurred in January 1974 (Reference 12). A discussion of flood magnitudes and 
storm damage was similar to their report issued afta* the 1964 floods in Oregon. 
A Flood Insurance Studies have been published for the unincorporated areas of Jackson County 
(Reference 1 and 32). The hydrologic analysis used in the Grants Pass study is consistent with the 
analysis used in the Jackson County study. 
48 
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Í TABLE8 
Flood Studies were prepared for thé incorporated area of Cave Junction (Reference 33), and for the 
incorporated area of Grants Pass (Reference 34). All data presented in these studies agree exactly 
with data presented herein. 
. . . . In November 1974, a Flood Hazard Boundary Map was published for Cave Junction (Reference 35). 
This Flood Insurance Study is more detailed and, thus, supersedes that map. 
This report either supersedes or is compatible with all previous studies published on streams studied 
in this report and should be considered authoritative for the purposes of theNFIP. 
8,0 LOCATION OF DATA 
Information concerning the pertinent data used in the preparation of this study ean be obtained by 
contacting FEMA, Mitigation Division, Federal Regional Center, 130 228th Street, SW, Bothell, 
Washington 98021-9796. 
9.0 BIBLIOGRAPHY AND REFERENCES 
1. Federal Emergency Management Agency, Flood Insurance Study. Jackson County. Oregon 
(Unincorporated Areas'). January 5, 1979 
2. Northwest River Basin Commission, Columbia Basin Inter-Agency Committee, River Mile 
Index. Rogue River and Tributaries in Oregon. Vancouver, Washington, 1967 
3. U.S. Department o f Housing and Urban Development, Federal Insurance Adminis tration, Flood 
Hazard Boundary Map. Josephine County, Oregon (Unincorporated Areas), Scale 1:24,000,1977 
4. State of Oregon, Oregon Blue Book. Salem, Oregon, 1977-1978 
5. U.S. Department of Commerce, Bureau of the Census website, 
http://www.cetisvvs.gov/main/www/cen2000Jitml 
6. Oregon State Water Resources Board, Rogue River Basin. Salem, Oregon, January 1959 
7. U.S. Department of the Interior, Geological Survey, Water-Supply Paper 1649, Water for 
Oregon. 1965 
8. U.S. Department of the Interior Geological Survey, 15-Minutes Series Topographic Maps, Scale 
1:62,500, Contour Interval 80 feet: Grants Pass, Oregon (1954) 
9. U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National 
Climatic Center, Climatogranhv of the United States No. 81 (OregonV Monthly Normals of 
Temperature. Precipitation, and Heating and Cooling Degree Days. 1941-1970 
10. U.S. Department of the Army, Corps of Engineers, Portland District, Post Flood Report, 
Portland, Oregon, July 1966 
50 
• 11. U.S. Department of the Army, Corps of Engineers, Portland District, Cumulative Frequency 
Curve - Maximum Annual Discharge, Rogue River at Giants Pass, Portland, Oregon, 1976 and 
- 1978 
12. U.S. Department of the Army, Corps of Engineers, Portland District, Post Flood Report, 
Portland, Oregon, 1975 
13. U.S. Department of the Army, Corps of Engineers, Portland District, Cumulative Frequency 
Curve - Maximum Annual Discharge. Rogue River at Grants Pass, Portland, Oregon, 1976 and 
1978 
14. U.S. Department of the Interior, Geological Survey, Log-Pearson Type III Flood-Frequency 
Analysis Using Guidelines of Water Resources Council (Program J-4071. Chapter 1, Section C, 
vol. 4, P.H. Corrigan and W. ICirby, 1976 
15. U.S. Water Resources Council, "Guidelines for Determining Flood Flow Frequency," Bulletin 
17,1976 
16. U.S. Department of the Interior, Geological Survey, Open-File Report 79-553, Magnitude and 
Frequency of Floods in Western Oregon. D.D. Harris, L.L. Hubbard, and L.E. Hubbard, 1979 
17. City of Grants Pass, Contour and Drainage Maps. Scale 1:2,400, Contour Interval 2 feet: Grants 
Pass, Oregon (1957) 
18. U.S.,Department of the Interior, Geological Survey, Water Resources Division, Open-File Report 
76-499, Computer Applications for Step-Backwater and Floodway Analysis. Program E-431, 
J.O. Shearman, 1976 
19. U.S. Department of the Interior, Geological Survey, Oregon District, Contour Map of Selected 
Reaches of Streams in Josephine County. Oregon, Scale 1:4800, Contour Interval 4 feet: 
Josephine County, Oregon, 1919 
20. U.S. Department of the Interior, Geological Survey, Water-Supply Paper 1869-A, Definition of 
Stage-Discharge Relations in Natural Channels bv Step-Backwater Analysis, J,F. Bailey and 
H.A. Ray, 1966 
21. U.S. Army Corps of Engineers, Generalized Computer Program HEC-2 Water-Surface Profiles, 
September 1988, Error Correction 03, Hydrologic Engineering Center, Davis, California 
22. U.S. Department of the Interior, Geological Survey, "Preparation of Input Data for Automatic 
Computation of Stage-Discharge Relations at Culverts," Techniques of Water-Resources 
Investigations. Book 7, Chapter C-3, H.F. Matthai, H.E. Stull, and Jacob Davidian, 1968 
23. U, S. Department of the Interior, Geological Survey, Water Resources Division, "Measurement of 
Peak Discharge at dams by Indirect Methods," Techniques of Water-Resources Investigations. 
Book 3, Chapter A-5, Harry Husling, 1967 
24. H.W, and E.F. Brater, Handbook of Hydraulics, 4<h Edition, New York: McGraw-Hill Book 
Company, 1954 
51 
25. U.S. Department of the Interior, Geological Survey, 7.5-Minute Series Topographic Maps: 
26. Josephine County, Aerial Photography, 2005 
27. City of Grants Pass,-OR, Topographic Mapping, Contour Interval 1-foot, 2004 
28. Federal Emergency Management Agency, Procedural Memorandum No. 36 - Profile Baselines 
on Digital Flood Insurance Rate Maps fDFIRMs) with Qrthophoto Bases. Washington, D.C., 
July 7,2005 
29. U.S. Department of the Army, Corps of Engineers, Portland District. Flood Plain Information -
Interim Report. Portland, Oregon, 1965 
30. U.S. Department of the Interior, Geological Survey, Water Resources Division, Flood Insurance 
Study, Josephine County. Oregon (Unincorporated Areas). Preliminary Draft Report, 
unpublished 
31. U.S. Department of the Interior, Geological Survey, Water Resources Division, Open-File 
Report, Water-Surface Elevations and Channel Characteristics for Selected Reaches of the Rogúe 
River and Élk Creek. Jackson and Josephine Counties. Portland, Oregon, 1970 
32. Federal Emergency Management Agency, Flood Insurance Study. Jackson County. Oregon. 
(Unincorporated Areas). September 27,1991 
33. Federal Emergency Management Agency, Flood Insurance Study. City of Cave Junction» 
Oregon, unpublished, September 27, 1991 
Map Name 
Applegate 
Buckskin Peak 
Bunker Creek 
Cave Junction 
Eight Dollar Mountain 
Galiee 
Glendale 
Golden 
Grants Pass 
Holland 
Kelsey Peak 
ICerby Peak 
King Mountain 
Merlin 
Mount Reuben 
Murphy 
Murphy Mountain 
O'Brien 
Onion Mountain 
Rogue River 
Selma 
Sexton Mountain 
Takilma 
Wilderville 
Date Scale 
1983 1:24,000 
1989 1:24,000 
1989 1:24,000 
1989 1:24,000 
1989 1:24,000 
1989 1:24,000 
1986 1:24,000 
1986 1:24,000 
1986 1:24,000 
1989 1:24,000 
1989 1:24,000 
1986 1:24,000 
1983 1:24,000 
1986 1:24,000 
1989 1:24,000 
1986 1:24,000 
1986 1:24,000 
1989 1:24,000 
1989 1:24,000 
1983 1:24,000 
1989 .1:24,000 
1986 .1:24,000 
1989 1:24,000 
1986 1:24,000 
Contour Interval 
40 ft 
40 ft 
40 ft 
40 ft 
40 ft 
40 ft 
40 ft 
40 ' f t 
40 ft 
40 ft 
40 ft 
40 ft 
40 ft 
40 ft 
40 ft 
40 ft 
40 ft 
40 ft 
40 ft 
40 ft 
40 ft 
40 ft 
40 ft 
20 ft 
52 
34. Federal Emergency Management Agency, Flood Insurance Study. City of GrantsPá^s.ÜregOTi, 
November 1980 
35. U.S. Department of Housing and Urban Development, Federal Insurance Administration, Flood 
Hazard Boundary Map, City of Cave Junction. Oregon. Scale 1:12,000, 1974 
10.0 REVISION DESCRIPTIONS 
This section has been added to provide information regarding significant revisions made since the 
original Flood Insurance Study was printed. Future revisions may be made that do not result in the 
republishing of the Flood Insurance Study report. To assure that any user is aware of all revisions, it 
is advisable to contact the community repository for your community. 
Allprevious study revision descriptions have been incorporated into the appropriate sections of this 
FIS, Table 9 summarizes the flooding sources updated since the original study was completed. 
Table 9. Revised Study Descriptions 
Flooding Source Community 
Rogue River 
Rogue River 
Louse Creek 
Applegate River 
Waters Creek 
Gilbert Creek 
Josephine County 
Unincorporated 
Areas arid the City 
of Grants Pass 
Josephine County 
Unincorporated 
Areas and the City 
of Grants Pass 
Josephine County 
Unincorporated 
Areas 
Josephine County 
Unincorporated 
Areas 
Josephine County 
Unincorporated 
Areas 
City of Grants 
Pass 
Limits of Study 
From approximately 
3.5 miles downstream 
to 2.2 miles upstream 
of the South 6* Street 
bridge 
From approximately 
5.2 miles downstream 
to 3.5 miles upstream 
of the South 6th Street 
bridge 
From approximately 
470 feet downstream 
of Monument Drive to 
Granite Hill Road 
From the upstream end 
of the initial analysis 
tó the Josephine-
Jackson County line 
From its confluence 
with Slate Creek 
upstream 
approximately 1 mile 
From SW Rogue River 
Avenue to just 
upstream of NW 
Windsor Drive 
Revision Date 
September 19, 
1990 
November 
2008 
September 19, 
1990 
September 19, 
1990 
September 19, 
.1990 
November 
2008 
Panel 
Numberfs) 
0484, 0492, 
0503,0511, 
0512, and 
0516 
0491, 0492, 
0503, 0511, 
0512,0516, 
0517 
0314, 0501, 
and 0502 
0708,0710, 
0720,0740, 
and 0750 
0656 
0504 
53 
Countywide Update (December 3, 2009) 
The countywide update was completed in November 2008 by WEST Consultants, Inc. for FEMA 
under Contract.No. EMS-2001-CO-OG68. 
This update combined the Flood Insurance Rate Maps and Flood Insurance Study reports for 
Josephine County and incorporated communities into the countywide format. Under the countywide 
format, FIRM panels have been produced using a single layout format for the entire area within the 
county instead of separate layout formats for each community. The single-layout format facilitates 
the matching of adjacent panels and depicts the flood-hazard area within the entire panel border, even 
in areas beyond a community's corporate boundary line. In addition, under the countywide format 
this single FIS report provides all associated information and data for the entire eounty area. 
As part of this revision, the format of the map panels has changed. Previously, flood-hazard 
information was.shown on both FIRMs and Flood Boundary and Floodway Maps (FBFMs). In the 
new format, all base flood elevations, cross sections, zone designations, and floodplain and floodway 
boundary delineations are shown on the FIRM; the FBFM has been eliminated. Some of the flood 
insurance zone designations were changed to reflect the new format. Areas previously shown as 
numbered Zone A were changed to Zone AE. Areas previously shown as Zone B were changed to 
Zone X (shaded). Areas previously shown as Zone C were changed to Zone X (unshaded). In 
addition, all Flood Insurance Zone Data Tables were removed from the FIS report and all zone 
designations and reach determinations were removed from the profile panels. 
All flood elevations shown in this FIS report and on the FIRM panels were converted from NGVD 29 
to NAVD 88. The conversion factor from NGVD to NAVD for all streams in this report is +3.36 
feet. 
The I - and 0.2-percent-annual-chance floods were redelineated on Gilbert .Creek and portions of the 
Rogue River using new topography with a one-foot contour interval provided by the City of Grants 
Pass (Reference 26). The cross section locations were digitized from the effective Floodway panels 
or work maps. Elevations used for the redelineation were taken from the effective floodway data 
tables and adjusted to theNAVD88 vertical datum. The redelineation along Gilbert Creek extended 
from SW Rogue River Avenue to just upstream o fNW Windsor Drive, a distance of approximately 
2.5 miles. Redelineation along the Rogue River extended from approximately river station 111,810 
(cross section CD) to river station 158,250 (cross section DJ). 
The floodplain boundaries for all other flooding sources, were digitized from the effective FIRM and 
Floodway panels. Aerial photography (Reference 25) and USGS IS Quadrangles (Reference 24) 
were used to adjust floodplain and floodway boundaries where appropriate. 
54 
OMPLETE REPORT LOCATED IN 
PLANNING FILE 
FLOOD 
INSURANCE 
STUDY 
JOSEPHINE COUNTY, OREGON 
AND INCORPORATED AREAS 
VOLUME 2 OF 2 
COMMUNITY COMMUNITY 
NAME' NUMBER 
CAVE JUNCTION. CITY OF 410107 
GRANTS PASS, CITY OF 410108 
JOSEPHINE COUNTY UNINCORPORATED AREAS 415590 
Effective: 
December 3, 2009 
Flood Insurance Study Number 
41033CV002A 
COMPLETE REPORT LOCATED IN PLANNING 








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t 
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1 3 . 0 2 0 G e n e r a l P r o v i s i o n s 1 3 - 1 
1 3 . 0 2 5 S p e c i a l P u r p o s e D i s t r i c t O v e r l a y Map 1 3 - 1 
1 3 . 1 0 0 S l o p e H a z a r d D i s t r i c t 1 3 - 1 
1 3 . 1 1 0 P u r p o s e 1 3 - 1 
1 3 . 1 1 1 D e f i n i t i o n 1 3 - 2 
1 3 . 1 2 0 P r o c e d u r e s f o r D e v e l o p m e n t o f P a r t i t i o n s , , 
S u b d i v i s i o n s a n d P l a n n e d U n i t D e v e l o p m e n t s 1 3 - 2 
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1 3 . 1 2 2 C o m p l e t e S u b m i t t a l 1 3 - 2 
1 3 . 1 2 3 C r i t e r i a f a r A p p r o v a l 1 3 - 2 
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1 3 . 1 3 3 E r o s i o n C o n t r o l P l a n . . . . 1 3 - 5 
1 3 . 1 4 0 C r i t e r i a f o r A p p r o v a l o f P l a n s a n d R e p o r t s 1 3 - 5 
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1 3 . 1 4 2 G r a d i n g P l a n 1 3 - 6 
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7 1 3 . 1 6 0 P r o c e d u r e s f o r A p p r o v a l o f G r a d i n g o r C o n s t r u c t i o n 
o n . a n E x i s t i n g L o t ; . . . . 1 3 - 8 
1 3 . 1 7 0 , A p p e a l s 1 3 - 9 
1 3 . 2 0 0 F l o o d H a z a r d D i s t r i c t - . . . . . . . . . . . . . . . . . . . . . . . . 1 3 - 1 0 
1 3 . 2 1 0 A u t h o r i z a t i o n / F i n d i n g s o f F a c t , , P u r p o s e , 
a n d O b j e c t i v e s 1 3 -
1 3 . 2 1 1 A u t h o r i 2 a t i o n 1 3 -
1 3 . 2 1 2 F i n d i n g s o f F a c t : 1 3 -
1 3 . 2 1 3 . P u r p o s e . . , I S -
I S . 2 1 4 M e t h o d s o f R e d u c i n g F l o o d L o s s e s .• . . . . . . . . . . . 1 3 -
1 3 . 2 2 0 D e f i n i t i o n s 
1 3 . 2 2 1 I n t e r p r e t a t i o n o f T e r m s 
1 3 . 2 2 2 D e f i n i t i o n s . . . . . . 
1 3 . 2 3 0 - G e n e r a l P r o v i s i o n s . 
1 3 . 2 3 1 L a n d s t o W h i c h T h i s A r t i c l e A p p l i e s 
1 3 . 2 3 2 B a s i s f o r E s t a b l i s h i n g t h e A r e a s o f 
S p e c i a l F l o o d H a z a r d 
. 1 3 -
, 1 3 -
1 3 -
1 3 -
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• M I B I T J 
1 3 . 2 3 3 C o m p l i a n c e 1 3 -
1 3 . 2 3 4 A b r o g a t i o n a n d G r e a t e r R e s t r i c t i o n s 1 3 -
1 3 . 2 3 5 I n t e r p r e t a t i o n 1 3 -
1 3 . 2 3 6 W a r n i n g a n d D i s c l a i m e r o f L i a b i l i t y 1 3 -
1 3 . 2 4 0 A d m i n i s t r a t i o n 1 3 -
1 3 . 2 4 1 D e v e l o p m e n t P e r m i t R e q u i r e d . 1 3 -
1 3 . 2 4 2 A p p l i c a t i o n a n d S u b m i t t a l R e q u i r e m e n t s 1 3 -
1 3 . 2 4 3 E l e v a t i o n C e r t i f i c a t i o n 1 3 -
1 3 . 2 4 4 D e s i g n a t i o n o f L o c a l A d m i n i s t r a t o r 1 3 -
1 3 . 2 4 5 D u t i e s a n d R e s p o n s i b i i i t i e s o f D i r e c t o r 1 3 -
- 1 3 . 2 4 6 V a r i a n c e s 1 3 -
1 3 . 2 4 7 A p p e a l s ' . . . . 1 3 - , 
1 3 . 2 5 0 P r o v i s i o n s f o r F l o o d H a z a r d R e d u c t i o n 1 3 -
1 3 . 2 5 1 G e n e r a l S t a n d a r d s 1 3 -
1 3 . 2 5 2 A n c h o r i n g 1 3 -
1 3 . 2 5 3 AH Z o n e D r a i n a g e .• 1 3 -
1 3 . 2 5 4 . C o n s t r u c t i o n . M a t e r i a l s a n d . M e t h o d s 1 3 -
1 3 . 2 5 5 U t i l i t i e s a n d S e r v i c e . , . . 1 3 -
1 3 . 2 5 6 R e v i e w W h e r e E l e v a t i o n " Data- N o t , A v a i l a b l e . . . 1 3 -
1 3 . 2 6 0 S p e c i f i c S t a n d a r d s . . . . . . . . . . . . . . . . . . . . 1 3 -
1 3 - 2 6 1 R e s i d e n t i a l C o n s t r u c t i o n 1 3 -
1 3 . 2 6 2 N o n - R e s i d e n t i a l C o n s t r u c t i o n . - 1 3 -
1 3 . 2 6 3 M a n u f a c t u r e d H o m e s . . . . , . 1 3 -
1 3 . 2 6 4 R e c r e a t i o n a l V e h i c l e s ^ . . . . . . . 1 3 -
1 3 . 2 6 5 C r a w l s p a c e s a n d B e l o w - G r a d e C r a w l s p a c e s 1 3 -
1 3 . 2 7 0 . , F l o o d w a y s , . . . . . . . . . . . 1 3 -
1 3 . 2 7 1 D e s i g n a t e d F l o o d w a y s 1 3 -
1 3 . 2 7 2 F l o o d w a y s N o t D e s i g n a t e d .". 1 3 -
1 3 . 2 8 0 : S t a n d a r d s f o r S h a l l o w F l o o d i n g A r e a s (AO Z o n e s ) . . 1 3 -
1 3 . 2 9 0 • C r i t i c a l F a c i l i t i e s a n d E s s e n t i a l F a c i l i t i e s . . . . . . 1 3 -
1 3 . 2 9 1 " • C r i t i c a l F a c i l i t i e s . . . . . . . . . , . , . . . . 1 3 -
1 3 ¿ 2 9 2 E s s e n t i a l F a c i l i t i e s 1 3 -
1 3 . 3 0 0 M e d i c a l O v e r l a y D i s t r i c t . . . . . ; . , 1 3 - 2 2 
1 3 . 3 1 0 , P u r p o s e . . . . . . . . . . . . . 1 3 - 2 2 
1 3 . 3 2 0 . P e r m i t t e d U s e s 1 3 - 2 2 
1 3 . 3 3 1 R e v i e w P r o c e d u r e S c h e d u l e 1 3 - 2 3 
1 3 . 3 3 2 . . C r i t e r i a f o r A p p r o v a l . . . . . i 1 3 - 2 - 3 
1 3 . 4 0 0 H i s t o r i c D i s t r i c t s . . . . . . . . . . . 1 . 3 -24 . 
' 1 3 . 4 1 1 . . P u r p o s e . . . . . . . . . . . . . . . . . . 1 3 - 2 4 
1 3 . 4 1 2 D e f i n i t i o n s . " . . . . ; 1 3 - 2 4 
1 3 . 4 2 0 D i s t r i c t T y p e s a n d Map . . . , 1 3 - 2 6 
. 1 3 . 4 2 1 H i s t o r i c T y p e s . . . . . . . . 1 3 - 2 6 
13. . 4 2 2 H i s t o r i c Map . . . . . . . . 1 3 - 2 6 
. 1 3 . 4 2 3 ' L a n d m a r k s I . . . . . . . . £ 1 3 - 2 6 
1 3 . 4 3 0 P r o c e d u r e s f o r H i s t o r i c R e v i e w 1 3 - 2 8 
^ 1 3 . 4 3 1 I n i t i a t i o n 1 3 - 2 8 
1 3 . 4 3 2 P r e a p p l i c a t i o n C o n f e r e n c e R e q u i r e d 1 3 - 2 8 
1 3 . 4 3 3 C o m p l e t e S u b m i t t a l 1 3 - 2 8 
1 3 . 4 3 4 D e s i g n a t i o n a n d R e v i e w P r o c e d u r e s 1 3 - 2 8 
1 3 . 4 3 5 A m e n d m e n t a n d R e c i s i o n P r o c e d u r e s 1 3 - 2 9 
1 3 . 4 3 6 A p p e a l s 1 3 - 2 9 
1 3 . 4 4 0 D e s i g n a t i o n o f H i s t o r i c D i s t r i c t s 1 3 - 2 9 
1 3 . 4 4 1 D e s i g n a t i o n C r i t e r i a 1 3 - 2 9 
1 3 . 4 4 2 H i s t o r i c a l B u i l d i n g s a n d S i t e s C o m m i s s i o n a n d 
C i t y C o u n c i l A c t i o n 1 3 - 2 9 
1 3 . 4 5 0 D e v e l o p m e n t R e v i e w 1 3 - 3 0 
1 3 . 4 5 1 R e v i e w R e q u i r e d 1 3 - 3 0 
1 3 . 4 5 2 C r i t e r i a f o r A p p r o v a l 1 3 - 3 0 
1.3. 4 5 3 H i s t o r i c a l B u i l d i n g s a n d S i t e s C o m m i s s i o n 
A c t i o n 1 3 - 3 0 
1 3 . 4 5 4 P u b l i c S a f e t y C a v e a t . 1 3 - 3 0 
1 3 . 4 6 0 D e m o l i t i o n R e v i e w 1 3 - 3 1 
1 3 . 4 6 1 R e v i e w R e q u i r e d 1 3 - 3 1 
. 1 3 . 4 6 2 C r i t e r i a f o r A p p r o v a l . . . 1 3 - 3 1 
1 3 . 4 6 3 H i s t o r i c a l B u i l d i n g s a n d S i t e s C o m m i s s i o n 
A c t i o n 1 3 - 3 2 
1 3 . 4 6 4 P u b l i c S a f e t y C a v e a t . . . . 1 3 - 3 4 
Article 13: Special Purpose Districts 
1 3 . 0 1 0 P u r p o s e 
T h e s p e c i a l p u r p o s e d i s t r i c t s a r e i n t e n d e d t o a c c o m m o d a t e 
d e v e l o p m e n t w i t h i n a r e a s w i t h s p e c i f i c n a t u r a l , 
h i s t o r i c a l , o r l o c a t i o n a l f e a t u r e s . T h e s t a n d a r d s h e r e i n 
a r e i n t e n d e d t o m i t i g a t e n a t u r a l h a z a r d s , t o p r o t e c t 
n a t u r a l o r h i s t o r i c a l f e a t u r e s , a n d / o r t o m i t i g a t e l a n d 
u s e c o n f l i c t s . T h e s p e c i a l d i s t r i c t s t a n d a r d s a p p l y i n 
a d d i t i o n t o t h e s t a n d a r d s o f t h e u n d e r l y i n g z o n i n g 
d i s t r i c t . 
2 1 3 . 0 2 0 , G e n e r a l P r o v i s i o n s 
T h e S p e c i a l P u r p o s e D i s t r i c t s s h a l l e n c o m p a s s l a n d a r e a s 
t h a t : 
( 1 ) h a v e s l o p e s e x c e e d i n g 15%. 
( 2 ) a r e l o c a t e d w i t h i n t h e b o u n d a r i e s o f t h e 1 0 0 y e a r f l o o d 
p l a i n . 
( 3 ) a r e l o c a t e d i n p r o x i m i t y t o h o s p i t a l a n d t h a t a r e 
a p p r o p r i a t e f o r m e d i c a l u s e s . 
(4 ) a r e r e c o g n i z e d a s h i s t o r i c a l l y s i g n i f i c a n t . 
3 1 3 . 0 2 5 S p e c i a l P u r p o s e D i s t r i c t O v e r l a y Map. T h e r e s h a l l b e a n 
. o v e r l a y m a p t o t h e Z o n i n g Map t h a t d e p i c t s b o u n d a r i e s ' o f 
t h e s p e c i a l d i s t r i c t s s h o w n h e r e i n . T h e s e m a p s a r e 
i n c o r p o r a t e d i n t o t h i s S e c t i o n b y r e f e r e n c e . T h e s p e c i a l 
p u r p o s e d i s t r i c t m a p s m a y b e a m e n d e d a s p r o v i d e d i n 
A r t i c l e 4 o f t h i s C o d e . T h e m a p s a r e g e n e r a l i n n a t u r e . 
T h e a p p l i c a n t f o r a d e v e l o p m e n t s h a l l v e r i f y t h e g r a d e s 
o n " l a n d s o r p o r t i o n s o f l a n d s t h a t a r e t h e s u b j e c t o f a n y 
s p e c i f i c a p p l i c a t i o n . 
1 3 . 2 0 0 F l o o d H a z a r d D i s t r i c t 
1 3 . 2 1 0 A u t h o r i z a t i o n , F i n d i n g s o f F a c t , P u r p o s e , a n d O b j e c t i v e s 
1 3 - 2 1 1 A u t h o r i z a t i o n . 
T h e S t a t e o f O r e g o n h a s , i n t h e h o m e r u l e p r o v i s i o n s o f . 
t h e O r e g o n C o n s t i t u t i o n , A r t i c l e X I S e c t i o n 2 , a n d i n ORS 
2 2 1 . 4 1 0 , d e l e g a t e d t h e r e s p o n s i b i l i t y t o l o c a l 
g o v e r n m e n t a l u n i t s t o a d o p t r e g u l a t i o n s d e s i g n e d t o 
p r o m o t e t h e p u b l i c h e a l t h , s a f e t y , a n d g e n e r a l w e l f a r e o f 
i t s c i t i z e n r y . 
1 3 . 2 1 2 F i n d i n g s o f F a c t . 
( 1 ) : T h e f l o o d h a z a r d a r e a s o f t h e C i t y a r e s u b j e c t t o 
p e r i o d i c i n u n d a t i o n w h i c h r e s u l t s i n l o s s o f l i f e a n d 
p r o p e r t y , h e a l t h a n d s a f e t y h a z a r d s , d i s r u p t i o n o f 
c o m m e r c e a n d g o v e r n m e n t a l s e r v i c e s , e x t r a o r d i n a r y p u b l i c 
e x p e n d i t u r e s f o r f l o o d p r o t e c t i o n a n d r e l i e f , a n d 
i m p a i r m e n t o f t h e t a x b a s e , a l l o f w h i c h a d v e r s e l y a f f e c t 
t h e p u b l i c h e a l t h , s a f e t y a n d g e n e r a l w e l f a r e . 
( 2 ) T h e s e f l o o d l o s s e s a r e c a u s e d b y t h e c u m u l a t i v e e f f e c t o f 
o b s t r u c t i o n s i n a r e a s o f s p e c i a l f l o o d h a z a r d s w h i c h 
i n c r e a s e f l o o d h e i g h t s a n d v e l o c i t i e s , a n d w h e n 
i n a d e q u a t e l y a n c h o r e d , d a m a g e u s e s i n o t h e r a r e a s . U s e s 
t h a t a r e i n a d e q u a t e l y f l o o d - p r o o f e d , e l e v a t e d ò r 
o t h e r w i s e p r o t e c t e d f r o m f l o o d d a m a g e a l s o c o n t r i b u t e t o 
t h e f l o o d l o s s . 
P u r p o s e . I t i s t h e p u r p o s e o f t h e F l o o d H a z a r d D i s t r i c t 
t o p r o m o t e t h è p u b l i c h e a l t h , s a f e t y , a n d g e n e r a l 
w e l f a r e , a n d t o m i n i m i z e p u b l i c a n d p r i v a t e l o s s e s d u e t o 
f l o o d c o n d i t i o n s i n s p e c i f i c a r e a s b y p r o v i s i o n s 
d e s i g n e d : 
T o p r o t e c t h u m a n l i f e a n d h e a l t h ; 
T o m i n i m i z e e x p e n d i t u r e o f p u b l i c m o n e y a n d c o s t l y f l o o d 
c o n t r o l j p r o j e c t s ; 
T o m i n i m i z e . t h e n e e d f o r rescue a n d r e l i e f „ e f f o r t s 
a s s o c i a t e d w i t h f l o o d i n g a n d g e n e r a l l y u n d e r t a k e n a t t h è 
e x p e n s e o f t h è g e n e r a l p u b l i c ; 
T o m i n i m i z e p r o l o n g e d b u s i n e s s i n t e r r u p t i o n s ; 
( 5 ) T o m i n i m i z e d a m a g e t o p u b l i c f a c i l i t i e s a n d u t i l i t i e s 
s u c h a s w a t e r a n d g a s m a i n s , e l e c t r i c , t e l e p h o n e a n d 
s e w e r l i n e s , s t r e e t s , a n d b r i d g e s l o c a t e d i n a r e a s o f 
s p e c i a l f l o o d h a z a r d ; 
1 3 . 2 1 3 
( 1 ) 
( 2 ) 
( 3 ) 
( 4 ) 
( 6 ) T o h e l p m a i n t a i n a s t a b l e t a x b a s e b y p r o v i d i n g f o r t h e 
s o u n d u s e a n d d e v e l o p m e n t o f a r e a s o f s p e c i a l f l o o d 
h a z a r d s o a s t o m i n i m i z e f u t u r e f l o o d b l i g h t a r e a s ; 
( 7 ) T o e n s u r e t h a t p o t e n t i a l b u y e r s a r e n o t i f i e d t h a t 
p r o p e r t y i s i n a n a r e a o f s p e c i a l f l o o d h a z a r d ; a n d 
( 8 ) T o e n s u r e t h a t t h o s e who o c c u p y t h e a r e a s o f s p e c i a l 
f l o o d h a z a r d a s s u m e r e s p o n s i b i l i t y f o r t h e i r a c t i o n s . 
1 3 . 2 1 4 M e t h o d s o f R e d u c i n g F l o o d L o s s e s . 
I n o r d e r t o a c c o m p l i s h i t s p u r p o s e s , t h i s A r t i c l e 
i n c l u d e s m e t h o d s a n d p r o v i s i o n s f o r : 
( 1 ) R e s t r i c t i n g o r p r o h i b i t i n g u s e s w h i c h a r e d a n g e r o u s t o 
h e a l t h , s a f e t y , . a n d p r o p e r t y d u e t o w a t e r o r e r o s i o n 
h a z a r d s , o r w h i c h r e s u l t i n d a m a g i n g i n c r e a s e s i n e r o s i o n 
o r i n f l o o d h e i g h t s o r v e l p c i t i e s ; 
( 2 ) R e q u i r i n g t h a t u s e s v u l n e r a b l e t o f l o o d s , i n c l u d i n g 
f a c i l i t i e s w h i c h s e r v e s u c h u s e s , b e p r o t e c t e d a g a i n s t 
f l o o d d a m a g e a t t h e , t i m e o f i n i t i a l c o n s t r u c t i o n ; 
( 3 ) C o n t r o l l i n g t h e a l t e r a t i o n o f n a t u r a l f l o o d p l a i n s , s t r e a m 
c h a n n e l s , a n d n a t u r a l p r o t e c t i v e b a r r i e r s , w h i c h h e l p 
a c c o m m o d a t e o r c h a n n e l f l o o d w a t e r s ; . 
( 4 ) C o n t r o l l i n g f i l l i n g , g r a d i n g , d r e d g i n g , . a n d o t h e r 
d e v e l o p m e n t w h i c h m a y i n c r e a s e f l o o d d a m a g e ; 
( 5 ) P r e v e n t i n g o r r e g u l a t i n g t h e c o n s t r u c t i o n o f f l o o d 
b a r r i e r s w h i c h w i l l - . u n h a t u r a l l y , d i v e r t f l o o d w a t e r s o r 
w h i c h m a y i n c r e a s e f l o o d h a z a r d s . i n o t h e r a r e a s ; a n d 
( 6 ) C o o r d i n a t i n g a n d s u p p l e m e n t i n g t h e p r o v i s i o n s . o f t h e 
s t a t e b u i l d i n g c p d w i t h l o c a l l a n d u s e a n d d e v e l o p m e n t 
o r d i n a n c e s . 
1 3 . 2 2 0 D e f i n i t i o n s 
1 3 . 2 2 1 . I n t e r p r e t a t i o n o.f T e r m s . U n l e s s s p e c i f i c a l l y d e f i n e d 
. b e l o w , w o r d s . o r p h r a s e s u s e d i n t h i s a r t i c l e s h a l l b e 
i n t e r p r e t e d s o a s t o g i v e t h e m t h e m e a n i n g t h e y h a v e i n 
c o m m o n u s a g e a n d t o g i v e t h i s a r t i c l e i t s m o s t r e a s o n a b l e 
a p p l i c a t i o n . , I n t h e e v e n t o f a c o n f l i c t b e t w e e n t h e 
d e f i n i t i o n s i n t h i s A r t i c l e a n d A r t i c l e 3 0 o f t h i s C o d e , 
t h e d e f i n i t i o n s i n t h i s A r t i c l e - s h a l l a p p l y t o t h e 
. p r o v i s i o n s o f t h i s A r t i c l e . 
1 2 . 2 2 2 D e f i n i t i o n s 
( 1 ) A p p e a l . " A p p e a l " m e a n s a r e q u e s t f o r a r e v i e w o f a n y 
p r o v i s i o n o f t h i s A r t i c l e o r a r e q u e s t f o r a v a r i a n c e . 
( 2 ) A r e a o f S h a l l o w F l o o d i n g . " A r e a o f s h a l l o w f l o o d i n g " 
m e a n s a d e s i g n a t e d AO o r AH z o n e o n t h e F l o o d I n s u r a n c e 
R a t e Map ( F I R M ) . T h e b a s e f l o o d d e p t h s r a n g e f r o m o n e t o 
t h r e e f e e t ; a c l e a r l y d e f i n e d c h a n n e l d o e s n o t e x i s t ; t h e 
p a t h o f f l o o d i n g i s u n p r e d i c t a b l e a n d i n d e t e r m i n a t e ; a n d 
v e l o c i t y f l o w m a y b e e v i d e n t . AO i s c h a r a c t e r i z e d a s 
s h e e t f l o w a n d AH i n d i c a t e s p o n d i n g . 
( 3 ) A r e a o f S p e c i a l F l o o d H a z a r d . " A r e a o f s p e c i a l f l o o d 
h a z a r d " o r " s p e c i a l f l o o d h a z a r d a r e a " (SFHA) m e a n s - t h e 
l a n d i n t h e f l o o d p l a i n w i t h i n a c o m m u n i t y s u b j e c t t o a 
o n e p e r c e n t o r g r e a t e r c h a n c e o f f l o o d i n g i n a g i v e n 
y e a r . D e s i g n a t i o n o n m a p s a l w a y s i n c l u d e s t h e l e t t e r s A 
o r V . 
( 4 ) B a s e F l o o d . " B a s e f l o o d " m e a n s t h e . f l o o d h a v i n g a o n e 
p e r c e n t c h a n c e o f b e i n g e q u a l e d o r e x c e e d e d i n a n y g i v e n 
y e a r . A l s o r e f e r r e d t o a s t h e " 1 0 0 - y e a r f l o o d . " 
D e s i g n a t i o n o n m a p s a l w a y s i n c l u d e s t h e l e t t e r s A o r V . 
( 5 ) B a s e m e n t . " B a s e m e n t " m e a n s a n y a r e a o f t h e b u i l d i n g 
h a v i n g i t s f l o o r s u b g r a d e ( b e l o w g r o u n d l e v e l ) o n a l l 
s i d e s . 
( 6 ) B e l o w - G r a d e C r a w l S p a c e . " B e l o w - g r a d e c r a w l s p a c e " m e a n s 
a n e n c l o s e d a r e a b e l o w t h e b a s e f l o o d e l e v a t i o n i n w h i c h 
t h e i n t e r i o r g r a d e o f t h e c r a w l s p a c e i s l o w e r t h a n t h e 
a d j a c e n t e x t e r i o r g r a d e . (An a t - g r a d e c r a w l - s p a c e i s o n e 
i n w h i c h t h e y i n t e r i o r g r a d e i s a t o r a b o v e t h e e l e v a t i o n 
o f t h e e x t e r i o r g r a d e ) . F o r b e l o w - g r a d e c r a w l s p a c e s , 
• t h e s e , r e g u l a t i o n s s p e c i f y t h a t t h e i n t e r i o r g r a d e i s n o t 
•'• m o r e t h a n t w o f e e t b e l o w t h e l o w e s t a d j a c e n t e x t e r i o r „ 
g r a d e , a n d t h e h e i g h t , m e a s u r e d f r o m t h e i n t e r i o r g r a d e 
o f t h e c r a w l s p a c e t o t h e t o p o f t h e c r a w l s p a c e 
f o u n d a t i o n , d o e s n o t e x c e e d 4 f e e t a t a n y p o i n t . 
( 7 ) C r i t i c a l F a c i l i t y . " C r i t i c a l f a c i l i t y " m e a n s a f a c i l i t y 
f o r w h i c h e v e n a s l i g h t c h a n c e o f f l o o d i n g m i g h t b e t o o 
. g r e a t . C r i t i c a l f a c i l i t i e s i n c l u d e , b u t a r e n o t l i m i t e d 
t o s c h o o l s , n u r s i n g h o m e s y h o s p i t a l s , p o l i c e , f i r e , a n d 
; : e m e r g e n c y r e s p o n s e i n s t a l l a t i o n s , i n s t a l l a t i o n s w h i c h 
p r o d u c e , u s e o r s t o r e h a z a r d o u s m a t e r i a l s o r h a z a r d o u s 
w a s t e . 
( 8 ) : D e v e l o p m e n t . " D e v e l o p m e n t " m e a n s a n y m a n m a d e c h a n g e t o 
i m p r o v e d o r u n i m p r o v e d r e a l e s t a t e , i n c l u d i n g b u t n o t 
l i m i t e d t o b u i l d i n g s o r o t h e r s t r u c t u r e s , m i n i n g , 
d r e d g i n g , f i l l i n g , g r a d i n g , p a v i n g , ^ x c a v a t i o n o r 
d r i l l i n g o p e r a t i o n s l o c a t e d w i t h i n t h e a r e a o f s p e c i a l 
f l o o d h a z a r d . 
( 9 ) E l e v a t e d B u i l d i n g . " E l e v a t e d b u i l d i n g " m e a n s f o r 
i n s u r a n c e p u r p o s e s , a n o n - b a s e m e n t b u i l d i n g w h i c h h a s i t s 
l o w e s t e l e v a t e d f l o o r r a i s e d a b o v e g r o u n d l e v e l b y 
f o u n d a t i o n s w a l l s , s h e a r w a l l s , p o s t , p i e r s , p i l i n g s , o r 
c o l u m n s . 
( 1 0 ) E s s e n t i a l F a c i l i t y . " E s s e n t i a l f a c i l i t y " h a s t h e m e a n i n g 
a s d e f i n e d i n t h e S t a t e B u i l d i n g C o d e . 
( 1 1 ) E x i s t i n g M a n u f a c t u r e d Home P a r k o r M a n u f a c t u r e d Home 
S u b d i v i s i o n . " E x i s t i n g m a n u f a c t u r e d h o m e p a r k o r 
m a n u f a c t u r e d h o m e s u b d i v i s i o n " m e a n s a m a n u f a c t u r e d h o m e 
p a r k o r m a n u f a c t u r e d h o m e s u b d i v i s i o n f o r w h i c h t h e 
c o n s t r u c t i o n o f f a c i l i t i e s f o r s e r v i c i n g t h e l o t s ( i n a 
s u b d i v i s i o n ) o r s p a c e s ( i n a p a r k ) o n w h i c h t h e 
m a n u f a c t u r e d h o m e s a r e t o b e a f f i x e d ( i n c l u d i n g , a t a 
m i n i m u m , t h e i n s t a l l a t i o n o f u t i l i t i e s , t h e c o n s t r u c t i o n 
o f s t r e e t s , a n d e i t h e r f i n a l s i t e g r a d i n g o r t h e p o u r i n g 
o f c o n c r e t e p a d s ) i s c o m p l e t e d b e f o r e t h e e f f e c t i v e d a t e 
o f t h e a d o p t e d f l o o d p l a i n m a n a g e m e n t r e g u l a t i o n s . 
( 1 2 ) E x p a n s i o n t o a n E x i s t i n g M a n u f a c t u r e d Home P a r k o r 
M a n u f a c t u r e d Hortie S u b d i v i s i o n . " E x p a n s i o n t o a n e x i s t i n g 
m a n u f a c t u r e d h o m e p a r k o r m a n u f a c t u r e d h o m e s u b d i v i s i o n " 
m e a n s t h e p r e p a r a t i o n , o f a d d i t i o n a l s i t e s b y t h e 
c o n s t r u c t i o n o f f a c i l i t i e s f o r s e r v i c i n g t h e l o t s o r 
s p a c e s o n w h i c h t h e m a n u f a c t u r e d h o m e s a r e t o b e a f f i x e d 
( i n c l u d i n g t h e i n s t a l l a t i o n - o f u t i l i t i e s , t h e 
c o n s t r u c t i o n o f s t r e e t s / a n d e i t h e r f i n a l s i t e g r a d i n g o r 
t h e p o u r i n g o f c o n c r e t e p a d s ) . 
( 1 3 ) F l o o d o r F l o o d i n g . " F l o o d " o r " f l o o d i n g " m e a n s a g e n e r a l 
a n d t e m p o r a r y c o n d i t i o n o f p a r t i a l o r c o m p l e t e i n u n d a t i o n 
o f n o r m a l l y d r y l a n d a r e a s f r o m : 
( a ) T h e o v e r f l o w o f i n l a n d o r t i d a l w a t e r s ; a n d / o r ; 
( b ) T h e u n u s u a l a n d r a p i d a c c u m u l a t i o n o f r u n o f f o f 
s u r f a c e w a t e r s f r o m a n y s o u r c e . 
(14.) F l o o d I n s u r a n c e R a t e Map (FIRM) . " F l o o d I n s u r a n c e R a t e 
Map ( F I R M ) " m e a n s t h e o f f i c i a l map o n w h i c h t h e - F e d e r a l 
I n s u r a n c e A d m i n i s t r a t i o n h a s d e l i n e a t e d b o t h t h è a r e a s o f 
s p e c i a l f l o o d h a z a r d s a n d t h e r i s k p r e m i u m z o n e s -
a p p l i c a b l e t o t h e c o m m u n i t y . 
( 1 5 ) F l o o d I n s u r a n c e S t u d y . " F l o o d I n s u r a n c e S t u d y " meains . t h e 
o f f i c i a l r e p o r t p r o v i d e d ' b y t h e F e d e r a r I n s u r a n c e 
A d m i n i s t r a t i o n t h a t i n c l u d e s f l o o d p r o f i l e s , t h e F l o o d 
B o u n d a r y - F l o o d w a y Map, a n d t h e w a t e r s u r f a c e e l e v a t i o n o f 
t h e b a s e f l o o d . 
( 1 6 ) F l o o d w a y . " F l o o d w a y " m e a n s t h e c h a n n e l o f a r i v e r o r 
o t h e r w a t e r c o u r s e a n d t h e a d j a c e n t l a n d a r e a s t h a t m u s t 
b e r e s e r v e d i n o r d e r t o d i s c h a r g e t h e b a s e f l o o d w i t h o u t 
c u m u l a t i v e l y i n c r e a s i n g t h e w a t e r s u r f a c e e l e v a t i o n m o r e 
t h a n o n e f o o t . 
( 1 7 ) L o w e s t F l o o r . " L o w e s t f l o o r " m e a n s t h e l o w e s t f l o o r o f 
t h e l o w e s t e n c l o s e d a r e a s ( i n c l u d i n g b a s e m e n t ) . An 
u n f i n i s h e d o r " f l o o d - r e s i s t a n t e n c l o s u r e , u s a b l e s o l e l y 
f o r p a r k i n g o f v e h i c l e s , b u i l d i n g a c c e s s o r s t o r a g e , i n 
a n a r e a o t h e r t h a n a b a s e m e n t a r e a , i s n o t c o n s i d e r e d t h e 
b u i l d i n g ' s l o w e s t f l o o r , p r o v i d e d t h a t s u c h e n c l o s u r e i s 
n o t b u i l t s o a s t o r e n d e r t h e s t r u c t u r e i n v i o l a t i o n o f 
t h e a p p l i c a b l e n o n - e l e v a t i o n d e s i g n r e q u i r e m e n t s o f t h i s 
o r d i n a n c e ( p r o v i s i o n s f o r f u l l y e n c l o s e d a r e a s b e l o w t h e 
l o w e s t f l o o r i n S e c t i o n 1 3 . 2 6 1 ( 2 ) a n d f o r c r a w l s p a c e s i n 
S e c t i o n 1 3 . 2 6 5 ) . 
( 1 8 ) . M a n u f a c t u r e d H o m e . " M a n u f a c t u r e d h o m e " m e a n s a 
s t r u c t u r e , t r a n s p o r t a b l e i n o n e o r m o r e s e c t i o n s , w h i c h 
i s b u i l t o n a p e r m a n e n t c h a s s i s a n d i s d e s i g n e d f o r u s e 
w i t h o r w i t h o u t a p e r m a n e n t f o u n d a t i o n w h e n a t t a c h e d t o 
t h e r e q u i r e d u t i l i t i e s . T h e t e r m " m a n u f a c t u r e d h o m e " 
d o e s n o t i n c l u d e a " r e c r e a t i o n a l v e h i c l e . " 
( 1 9 ) M a n u f a c t u r e d Home P a r k o r M a n u f a c t u r e d r H o m e S u b d i v i s i o n . 
" M a n u f a c t u r e d Home P a r k o r M a n u f a c t u r e d Home S u b d i v i s i o n " 
m e a n s a p a r c e l ( o r c o n t i g u o u s p a r c e l s ) o f l a n d d i v i d e d 
i n t o t w o o r . m o r e m a n u f a c t u r e d h o m e l o t s o r s p a c e s f o r 
r e n t o r s a l e . 
( 2 0 ) . N e w C o n s t r u c t i o n . "New c o n s t r u c t i o n " m e a n s s t r u c t u r e s 
f o r w h i c h t h e " s t a r t o f c o n s t r u c t i o n " c o m m e n c e d o n o r 
a f t e r t h e e f f e c t i v e d a t e o f a d o p t e d f l o o d p l a i n m a n a g e m e n t 
r e g u l a t i o n s . 
(2 .1) New M a n u f a c t u r e d Home P a r k o r M a n u f a c t u r e d Home 
S u b d i v i s i o n . "New m a n u f a c t u r e d h o m e p a r k o r m a n u f a c t u r e d 
h o m e s u b d i v i s i o n " m e a n s a m a n u f a c t u r e d h o m e p a r k o r 
s u b d i v i s i o n f o r w h i c h t h e c o n s t r u c t i o n o f f a c i l i t i e s f o r 
s e r v i c i n g t h e l o t s o r s p a c e s o n w h i c h t h e m a n u f a c t u r e d 
h o m e s a r e t o b e a f f i x e d ( i n c l u d i n g a t a m i n i m u m , t h e 
i n s t a l l a t i o n o f u t i l i t i e s , t h e c o n s t r u c t i o n o f s t r e e t s , 
a n d e i t h e r f i n a l s i t e g r a d i n g o r t h e p o u r i n g o f c o n c r e t e 
p a d s ) i s c o m p l e t e d o n o r a f t e r t h e e f f e c t i v e d a t e o f 
a d o p t e d f l o o d p l a i n m a n a g e m e n t r e g u l a t i o n s . . 
( 2 2 ) R e c r e a t i o n a l V e h i c l e . " R e c r e a t i o n a l v e h i c l e " m e a n s a 
v e h i c l e w h i c h i s : 
( a ) B u i l t o n a s i n g l e c h a s s i s ; 
( b ) 4 0 0 s q u a r e f e e t o r l e s s w h e n m e a s u r e d a t t h e l a r g e s t 
h o r i z o n t a l p r o j e c t i o n ; 
( c ) D e s i g n e d t o b e s e l f - p r o p e l l e d o r p e r m a n e n t l y t o w a b l e 
b y a l i g h t d u t y t r u c k ; a n d 
(d ) D e s i g n e d p r i m a r i l y n o t f o r u s e a s a p e r m a n e n t 
d w e l l i n g b u t a s t e m p o r a r y l i v i n g q u a r t e r s f o r 
r e c r e a t i o n a l , c a m p i n g , t r a v e l , o r s e a s o n a l u s e . 
( 2 3 ) S t a r t o f C o n s t r u c t i o n . " S t a r t o f c o n s t r u c t i o n " i n c l u d e s 
s u b s t a n t i a l i m p r o v e m e n t a n d m e a n s t h e d a t e t h e b u i l d i n g 
p e r m i t w a s i s s u e d , p r o v i d e d t h e a c t u a l s t a r t o f 
c o n s t r u c t i o n , r e p a i r , r e c o n s t r u c t i o n , p l a c e m e n t , o r o t h e r 
i m p r o v e m e n t w a s w i t h i n 18 0 d a y s o f t h e p e r m i t d a t e . . 
T h e a c t u a l s t a r t m e a n s e i t h e r t h e f i r s t p l a c e m e n t o f . 
p e r m a n e n t c o n s t r u c t i o n o f a s t r u c t u r e o n a s i t , s u c h a s 
t h e p o u r i n g o f s l a b o r f o o t i n g s , t h e i n s t a l l a t i o n o f 
p i l e s , t h e c o n s t r u c t i o n o f c o l u m n s , o r a n y w o r k b e y o n d 
t h e s t a g e o f e x c a v a t i o n ; o r t h e p l a c e m e n t o f a 
m a n u f a c t u r e d h o m e o n a f o u n d a t i o n . 
P e r m a n e n t c o n s t r u c t i o n d o e s n o t i n c l u d e l a n d p r e p a r a t i o n , 
s u c h a s c l e a r i n g g r a d i n g a n d f i l l i n g ; n o r d o e s i t i n c l u d e 
t h e i n s t a l l a t i o n o f s t r e e t s a n d / o r w a l k w a y s ; n o r d o e s i t 
i n c l u d e e x c a v a t i o n f o r a b a s e m e n t , f o o t i n g s , p i e r s , o r 
f o u n d a t i o n s o r t h e e r e c t i o n o f t e m p o r a r y f o r m s , ; n o r d o e s 
i t i n c l u d e t h e i n s t a l l a t i o n o n t h e p r o p e r t y o f a c c e s s o r y 
b u i l d i n g s , s u c h a s g a r a g e s o r s h e d s n o t o c c u p i e d a s 
d w e l l i n g u n i t s o r n o t p a r t o f t h e m a i n s t r u c t u r e . 
F o r a s u b s t a n t i a l i m p r o v e m e n t , t h e a c t u a l s t a r t . o f 
c o n s t r u c t i o n m e a n s t h e f i r s t a l t e r a t i o n o f a n y w a l l , 
c e i l i n g , f l o o r , o r o t h e r s t r u c t u r a l p a r t o f a b u i l d i n g , 
w h e t h e r o r n o t t h a t a l t e r a t i o n a f f e c t s t h e e x t e r n a l 
d i m e n s i o n s o f t h e b u i l d i n g . 
(24) . S t a t e B u i l d i n g C o d e . " S t a t e B u i l d i n g C o d é " m e a n s t h e 
c o m b i n e d s p e c i a l t y c o d e s . 
( 2 5 ) S t r u c t u r e . " S t r u c t u r e " m e a n s a w a l l e d a n d r o o f e d 
b u i l d i n g i n c l u d i n g a. g a s o r l i q u i d s t o r a g e t a n k t h a t i s 
. p r i n c i p a l l y a b o v e g r o u n d . 
( 2 6 ) S u b s t a n t i a l Damage . - " S u b s t a n t i a l d a m a g e " m e a n s . d a m a g e o f 
. a n y o r i g i n s u s t a i n e d b y a s t r u c t u r e w h e r e b y t h e c o s t o f . 
r e s t o r i n g t h e s t r u c t u r e t o i t s b e f o r e d a m a g e d c o n d i t i o n 
w o u l d e q u a l o r . e x c e e d 5 0 p e r c e n t o f t h e m a r k e t v a l u e o f 
t h e s t r u c t u r e b e f o r e t h e d a m a g e o c c u r r e d . 
( 2 7 ) S u b s t a n t i a l i m p r o v e m e n t . " S u b s t a n t i a l i m p r o v e m e n t " m e a n s 
a n y r e p a i r ( r e c o n s t r u c t i o n , o r i m p r o v e m e n t o f a 
s t r u c t u r e , t h e c o s t o f w h i c h e q u a l s o r e x c e e d s 5 0 p e r c e n t 
o f t h e m a r k e t v a l u e o f t h e s t r u c t u r e e i t h e r : 
( a ) B e f o r e t h e i m p r o v e m e n t o r r e p a i r i s s t a r t e d ; o r 
( b ) I f t h e s t r u c t u r e h a s b e e n d a m a g e d a n d i s b e i n g 
r e s t o r e d , b e f o r e t h e d a m a g e o c c u r r e d . 
F o r t h e p u r p o s e s o f t h i s d e f i n i t i o n , " s u b s t a n t i a l 
i m p r o v e m e n t " i s c o n s i d e r e d t o o c c u r w h e n t h e f i r s t 
a l t e r a t i o n o f a n y w a l l , c e i l i n g , f l o o r , o r o t h e r 
s t r u c t u r a l p a r t o f t h e b u i l d i n g c o m m e n c e s , w h e t h e r 
o r n o t t h a t a l t e r a t i o n a f f e c t s t h e e x t e r n a l 
d i m e n s i o n s ' o f t h e s t r u c t u r e . 
T h e t e r m d o e s n o t , h o w e v e r , i n c l u d e e i t h e r : 
( a ) A n y p r o j e c t f o r i m p r o v e m e n t o f a s t r u c t u r e t o 
c o r r e c t e x i s t i n g v i o l a t i o n s o f s t a t e o r l o c a l 
h e a l t h , s a n i t a r y , o r s a f e t y c o d e s p e c i f i c a t i o n s 
w h i c h h a v e b e e n i d e n t i f i e d b y t h e l o c a l c o d e 
e n f o r c e m e n t o f f i c i a l a n d w h i c h a r e t h e m i n i m u m 
n e c e s s a r y t o a s s u r e s a f e l i v i n g c o n d i t i o n s ; o r 
( b ) A n y a l t e r a t i o n o f a s t r u c t u r e l i s t e d o n t h e N a t i o n a l 
. R e g i s t e r o f H i s t o r i c P l a c e s o r a S t a t e I n v e n t o r y o f 
H i s t o r i c P l a c e s . 
(2.8) V a r i a n c e . " V a r i a n c e " m e a n s a g r a n t o f r e l i e f f r o m t h e 
r e q u i r e m e n t s o f t h i s A r t i c l e w h i c h p e r m i t s c o n s t r u c t i o n 
i n a m a n n e r t h a t w o u l d o t h e r w i s e b e p r o h i b i t e d b y t h i s 
A r t i c l e . 
( 2 9 ) W a t e r D e p e n d e n t . " W a t e r d e p e n d e n t " m e a n s a s t r u c t u r e f o r 
c o m m e r c e or^ i n d u s t r y w h i c h c a n n o t e x i s t i n a n y o t h e r 
l o c a t i o n a n d i s d e p e n d e n t o n t h e w a t e r b y r e a s o n o f t h e 
i n t r i n s i c n a t u r e o f i t s o p e r a t i o n s . 
1 3 . 2 3 0 G e n e r a l P r o v i s i o n s 
1 3 . 2 3 1 L a n d s t o W h i c h T h i s A r t i c l e A p p l i e s . ' T h e p r o v i s i o n s o f 
t h i s a r t i c l e s h a l l a p p l y t o a l l a r e a s o f s p e c i a l f l o o d 
h a z a r d s w i t h i n t h e j u r i s d i c t i o n o f t h e C i t y o f G r a n t s 
P a s s , i n c l u d i n g a n y a r e a s m a n a g e d u n d e r I n t e r g o v e r n m e n t a l 
A g r e e m e n t i n a c c o r d a n c e w i t h t h e a u t h o r i t y p r o v i d e d i n 
O r e g o n R e v i s e d S t a t u t e C h a p t e r 1 9 0 . 
1 3 . 2 3 2 B a s i s f o r E s t a b l i s h i n g t h e A r e a s o f S p e c i a l F l o o d H a z a r d . 
T h e a r e a s o f s p e c i a l f l o o d h a z a r d i d e n t i f i e d b y t h e F l o o d 
I n s u r a n c e A d m i n i s t r a t i o n i n a s c i e n t i f i c a n d e n g i n e e r i n g 
r e p o r t e n t i t l e d " F l o o d I n s u r a n c e S t u ^ y , J o s e p h i n e C o u n t y 
a n d I n c o r p o r a t e d A r e a s , " d a t e d D e c e m b e r 3 , 2 0 0 9 , w i t h 
a c c o m p a n y i n g F l o o d I n s u r a n c e M a p s , a n d a n y r e v i s i o n , a r e 
h e r e b y a d o p t e d b y r e f e r e n c e a n d d e c l a r e d t o b e p a r t o f 
t h i s C o d e . T h e b e s t a v a i l a b l e i n f o r m a t i o n f o r f l o o d 
h a z a r d a r e a i d e n t i f i c a t i o n a s o u t l i n e d i n S e c t i o n 
1 3 . 2 4 5 ( 2 ) s h a l l b e t h e b a s i s f o r r e g u l a t i o n u n t i l a n e w 
FIRM i s i s s u e d w h i c h i n c o r p o r a t e s t h e d a t a u t i l i z e d u n d e r 
S e c t i o n 1 3 . 2 4 5 ( 2 ) . 
T h e a r e a s o f s p e c i a l f l o o d h a z a r d s h a l l b e d e p i c t e d o n 
t h e S p e c i a l P u r p o s e D i s t r i c t o v e r l a y m a p s o f t h i s C o d e . 
T h e F l o o d I n s u r a n c e S t u d y a n d F l o o d M a p s a r e o n f i l e a t 
t h e D e p a r t m e n t o f C o m m u n i t y D e v e l o p m e n t , a n d a r e 
a v a i l a b l e f o r p u b l i c r e v i e w . 
1 3 . 2 3 3 C o m p l i a n c e . No s t r u c t u r e o r l a n d s h a l l h e r e a f t e r b e 
c o n s t r u c t e d , l o c a t e d , e x t e n d e d , c o n v e r t e d o r a l t e r e d 
w i t h o u t f u l l c o m p l i a n c e w i t h t h e t e r m s o f t h i s A r t i c l e 
a n d o t h e r a p p l i c a b l e r e g u l a t i o n s , i n c l u d i n g a l l 
a p p l i c a b l e r e q u i r e m e n t s o f t h e S t a t e B u i l d i n g C o d e , a n d 
, a l l FEMA r e q u i r e m e n t s , i n c l u d i n g r e q u i r e m e n t s o f t h e 
FE.MA/FIA T e c h n i c a l B u l l e t i n s . 
F a i l u r e t o c o m p l y w i t h a n y o f t h e r e q u i r e m e n t s o f t h i s 
A r t i c l e , i n c l u d i n g v i o l a t i o n s o f c o n d i t i o n s a n d 
s a f e g u a r d s e s t a b l i s h e d i n c o n n e c t i o n w i t h t h e c o n d i t i o n s , 
s h a l l c o n s t i t u t e a v i o l a t i o n - P e n a l t i e s f o r v i o l a t i o n s 
a n d n o n c o m p l i a n c e , a n d r e m e d i e s t o c o r r e c t v i o l a t i o n s a n d 
n o n c o m p l i a n c e , a r e g o v e r n e d b y t h e p r o v i s i o n s o f A r t i c l e 
. ; 1 o f t h i s C o d e a n d a n y a n d a l l o t h e r p r o v i s i o n s o f t h i s 
C o d e , t h e M u n i c i p a l C o d e , a n d l a w s o f t h e C i t y o f G r a n t s 
P a s s . 
A b r o g a t i o n a n d G r e a t e r R e s t r i c t i o n s . T h i s A r t i c l e i s n o t 
i n t e n d e d t o r e p e a l , a b r o g a t e , o r i m p a i r a n y e x i s t i n g 
e a s e m e n t s , c o v e n a n t s , o r d e e d r e s t r i c t i o n s . H o w e v e r , 
w h e r e t h i s . A r t i c l e a n d a n o t h e r o r d i n a n c e , s t a t e b u i l d i n g 
c o d e , e a s e m e n t , c o v e n a n t , o r d e e d r e s t r i c t i o n c o n f l i c t o r 
o v e r l a p , w h i c h e v e r i m p o s e s t h e m o r e s t r i n g e n t 
r e s t r i c t i o n s s h a l l p r e v a i l . 
1 3 . 2 3 5 I n t e r p r e t a t i o n . I n t h e i n t e r p r e t a t i o n a n d a p p l i c a t i o n o f 
t h i s A r t i c l e , a l l p r o v i s i o n s s h a l l b e : 
, ( 1 ) C o n s i d e r e d as . m i n i m u m r e q u i r e m e n t s ; 
( 2 ) L i b e r a l l y c o n s t r u e d i n f a v o r o f t h e g o v e r n i n g b o d y ; a n d 
( 3 ) D e e m e d t o n e i t h e r l i m i t n o r r e p e a l a n y o t h e r p o w e r s 
. g r a n t e d u n d e r s t a t e s t a t u t e s a n d r u l e s i n c l u d i n g t h e . 
s t a t e b u i l d i n g c o d é . 
1 3 . 2 3 4 
1 3 - 2 3 6 W a r n i n g a n d D i s c l a i m e r o f L i a b i l i t y . T h e d e g r e e o f f l o o d 
p r o t e c t i o n r e q u i r e d b y t h i s a r t i c l e i s c o n s i d e r e d 
r e a s o n a b l e f o r r e g u l a t o r y p u r p o s e s a n d i s b a s e d o n 
s c i e n t i f i c a n d e n g i n e e r i n g c o n s i d e r a t i o n s . L a r g e r f l o o d s 
c a n a n d w i l l o c c u r o n r a r e o c c a s i o n s . F l o o d h e i g h t s m a y 
b e i n c r e a s e d b y m a n - m a d e o r n a t u r a l c a u s e s . T h i s a r t i c l e 
d o e s n o t i m p l y t h a t l a n d o u t s i d e t h e a r e a s o f s p e c i a l 
f l o o d h a z a r d s o r u s e s p e r m i t t e d w i t h i n s u c h a r e a s w i l l b e 
f r e e f r o m f l o o d i n g o r f l o o d d a m a g e s . T h i s a r t i c l e s h a l l 
n o t c r e a t e l i a b i l i t y o n t h e p a r t o f t h e C i t y o f G r a n t s 
P a s s , a n y o f f i c e r o r e m p l o y e e t h e r e o f , o r t h e F e d e r a l 
I n s u r a n c e A d m i n i s t r a t i o n , f o r a n y f l o o d d a m a g e s t h a t 
r e s u l t f r o m r e l i a n c e o n t h i s o r d i n a n c e o r a n y 
a d m i n i s t r a t i v e d e c i s i o n l a w f u l l y m a d e h e r e u n d e r . 
1 3 . 2 4 0 A d m i n i s t r a t i o n . 
1 3 . 2 4 1 D e v e l o p m e n t P e r m i t R e q u i r e d . A D e v e l o p m e n t P e r m i t s h a l l 
b e o b t a i n e d b e f o r e c o n s t r u c t i o n o r d e v e l o p m e n t b e g i n s 
w i t h i n a n y a r e a o f s p e c i a l f l o o d h a z a r d e s t a b l i s h e d i n 
S e c t i o n 1 3 . 2 3 2 . T h e p e r m i t s h a l l b e f o r a l l s t r u c t u r e s 
i n c l u d i n g m a n u f a c t u r e d h o m e s , a s s e t f o r t h i n t h e 
D e f i n i t i o n s s e c t i o n o f t h i s A r t i c l e , a n d f o r a l l 
d e v e l o p m e n t i n c l u d i n g f i l l a n d o t h e r a c t i v i t i e s , a l s o a s 
s e t f o r t h i n t h e D e f i n i t i o n s s e c t i o n o f t h i s A r t i c l e . 
1 3 . 2 4 2 A p p l i c a t i o n a n d S u b m i t t a l R e q u i r e m e n t s f o r D e v e l o p m e n t 
P e r m i t . 
A p p l i c a t i o n f o r a d e v e l o p m e n t p e r m i t s h a l l b e m a d e , o n 
f o r m s f u r n i s h e d b y t h e . C o m m u n i t y D e v e l o p m e n t D e p a r t m e n t 
a n d s h a l l i n c l u d e t h e f o l l o w i n g . A c t i o n s w h i c h r e q u i r e a 
l a n d u s e a p p r o v a l p r i o r t o a d e v e l o p m e n t p e r m i t s h a l l 
i n c l u d e t h e r e q u i r e d i n f o r m a t i o n a s p a r t o f t h e l a n d \ i s e 
T\ a p p l i c a t i o n . 
{ 1 ) P l a n d r a w n t o s c a l e , s h o w i n g t h e n a t u r e , l o c a t i o n , 
d i m e n s i o n s a n d e l e v a t i o n s o f t h e a r e a i n q u e s t i o n ; 
. ( 2 ) E x i s t i n g a n d p r o p o s e d s t r u c t u r e s , m a n u f a c t u r e d h o u s i n g 
p a d s , f i l l , s t o r a g e o f m a t e r i a l s , . d r a i n a g e f a c i l i t i e s , 
a n d t h e l o c a t i o n o f t h e f o r e g o i n g i t e m s ; 
( 3 ) E l e v a t i o n i n r e l a t i o n t o m e a n s e a l e v e l , o f t h e l o w e s t 
. ~ f l o o r ( i n c l u d i n g b a s e m e n t ) o f a l l s t r u c t u r e s ; 
( 4 ) E l e v a t i o n i n r e l a t i o n t o m e a n , s e a l e v e l o f f l o o d p r o o f i n g 
i n a n y s t r u c t u r e ; ' 
( 5 ) C e r t i f i c a t i o n b y a r e g i s t e r e d p r o f e s s i o n a l e n g i n e e r o r 
a r c h i t e c t t h a t t h e f l o o d p r o o f i n g m e t h o d s f o r a n y n o n -
r e s i d e n t i a l s t r u c t u r e m e e t t h e f l o o u ^ r o o f i n g c r i t e r i a i n 
S e c t i o n 1 3 . 2 6 2 ; 
( 6 ) D e s c r i p t i o n o f t h e e x t e n t t o w h i c h a n y w a t e r c o u r s e w i l l 
b e a l t e r e d o r r e l o c a t e d a s a r e s u l t o f t h e p r o p o s e d 
d e v e l o p m e n t ; 
( 7 ) E x i s t i n g a n d p r o p o s e d r o a d w a y s ; 
( 8 ) A r e a , l o c a t i o n a n d f i n i s h e l e v a t i o n s o f a l l f i l l w a l l s 
a n d r i p - r a p ; 
( 9 ) L o c a t i o n a n d e l e v a t i o n o f s t o r e d m a t e r i a l s ; 
( 1 0 ) L o c a t i o n a n d e l e v a t i o n o f d r a i n a g e f a c i l i t i e s ; ( 
( 1 1 ) L o c a t i o n a n d e l e v a t i o n o f u t i l i t i e s ; a n d 
( 1 2 ) O t h e r p l a n r e q u i r e m e n t s o f t h i s C o d e a s a p p l i c a b l e ; 
1 3 . 2 4 . 3 E l e v a t i o n C e r t i f i c a t i o n . A l l r e q u i r e d e l e v a t i o n s s h a l l 
b e t i e d i n t o k n o w n b e n c h m a r k s s h o w n o n t h e . F l o o d 
I n s u r a n c e R a t e Map b y a r e g i s t e r e d p r o f e s s i o n a l s u r v e y o r . 
S a i d s u r v e y o r s h a l l a t t e s t t o t h e p r o c e d u r e , b e n c h m a r k s 
. u s e d a n d a c c u r a c y o f t h e r e q u i r e d e l e v a t i o n o v e r h i s 
s i g n a t u r e a n d s e a l u p o n t h e r e q u i r e d p l a n d i s p l a y i n g t h e 
e l e v a t i o n i n f o r m a t i o n . ~ 
1 3 . 2 4 4 D e s i g h a t i o n o f . L o c a 1 A d m i n i s t r a t o r . T h e C o m m u n i t y 
D e v e l o p m e n t D i r e c t o r i s h e r e b y a p p o i n t e d t o a d m i n i s t e r 
a n d . i m p l e m e n t t h i s A r t i c l e b y - g r a n t i n g o r . d e n y i n g 
- d e v e l o p m e n t p e r m i t a p p l i c a t i o n s i n a c c o r d a n c e w i t h i t s 
p r o v i s i o n s . 
1 3 - 2 4 . 5 Du t i é s a n d R e s p o n s i b i 1 i t i e s o f D i t e . c t o r . T h e d u t i e s o f 
t h e D i r e c t o r s h a l l i n c l u d e , b u t n o t b e . l i m i t e d t o , t h e 
f o l l o w i n g : 
( 1 ) P e r m i t R e v i e w . 
( a ) R e v i e w , a l l d e v e l o p m e n t p e r m i t s t o d e t e r m i n e t h a t t h e 
p e r m i t r e q u i r e m e n t s a n d c o n d i t i o n s o f t h i s a r t i c l e 
h a v e b e e n s a t i s f i e d . 
( b ) R e v i e w a l l d e v e l o p m e n t p e r m i t s t o d e t e r m i n e t h a t a l l . 
n e c e s s a r y p e r m i t s h a v e . b e e n o b t a i n e d f r o m t h o s e 
. F e d e r a l , . S t a t e o r l o c a l g o v e r n m e n t a l a g e n c i e s f r o m 
w h i c h p r i o r a p p r o v a l i s r e q u i r e d . 
( c ) R e v i e w a l l d e v e l o p m e n t p e r m i t s t o d e t e r m i n e i f t h e 
p r o p o s e d d e v e l o p m e n t i s l o c a t e d . i n t h e f l o o d w a y . I f 
l o c a t e d i n t h e f l o o d w a y , a s s u r e t h a t t h e 
e n c r o a c h m e n t p r o v i s i o n s o f S e c t i o n 1 3 . 2 7 0 a r e m e t . 
( 2 ) U s e o f O t h e r B a s e F l o o d D a t a ( i n A a n d V Z o n e s ) . When 
b a s e f l o o d e l e v a t i o n d a t a h a s n o t b e e n p r o v i d e d a s 
r e q u i r e d b y t h i s a r t i c l e , t h e a p p l i c a n t s h a l l o b t a i n a n d 
t h e D i r e c t o r s h a l l r e v i e w a n d r e a s o n a b l y u t i l i z e a n y b a s e 
f l o o d e l e v a t i o n a n d f l o o d w a y d a t a a v a i l a b l e f r o m a 
F e d e r a l , S t a t e o r o t h e r s o u r c e , i n o r d e r t o a d m i n i s t e r 
t h i s a r t i c l e . 
( 3 ) I n f o r m a t i o n t o b e O b t a i n e d a n d M a i n t a i n e d b y t h e 
D i r e c t o r . 
( a ) W h e r e b a s e f l o o d e l e v a t i o n d a t a i s p r o v i d e d t h r o u g h 
t h e F l o o d I n s u r a n c e S t u d y , F l o o d I n s u r a n c e R a t e 
M a p s , o r a s r e q u i r e d i n S e c t i o n ( 2 ) . a b o v e : O b t a i n 
a n d r e c o r d t h e a c t u a l e l e v a t i o n ( i n r e l a t i o n t o m e a n 
s e a l e v e l ) o f t h e l o w e s t f l o o r ( i n c l u d i n g b a s e m e n t s 
a n d b e l o w - g r a d e c r a w l s p a c e s ) o f a l l n e w o r 
s u b s t a n t i a l l y i m p r o v e d s t r u c t u r e s , a n d w h e t h e r o r 
n o t t h e s t r u c t u r e c o n t a i n s a b a s e m e n t . 
( b ) F o r a l l n e w o r s u b s t a n t i a l l y i m p r o v e d f l o o d p r o o f e d 
s t r u c t u r e s w h e r e b a s e f l o o d e l e v a t i o n d a t a i s 
p r o v i d e d t h r o u g h t h e F l o o d I n s u r a n c e S t u d y , FIRM, o r 
a s r e q u i r e d i n S e c t i o n ( 2 ) a b o v e : 
( i ) V e r i f y a n d r e c o r d t h e a c t u a l e l e v a t i o n ( i n 
r e l a t i o n t o m e a n s e a l e v e l ) ; a n d 
( i i ) M a i n t a i n t h e f l o o d p r o o f i n g c e r t i f i c a t i o n s 
r e q u i r e d i n S é c t i o n 1 3 . 2 4 2 ( 5 ) . 
( c ) M a i n t a i n t h e r e c o r d s o f a l l a p p e a l a c t i o n s a n d / 
v a r i a n c e s , a n d r e p o r t a n y a p p e a l a c t i o n s o r 
v a r i a n c e s t o t h e F e d e r a l I n s u r a n c e A d m i n i s t r a t i o n 
u p o n r e q u e s t . 
( d ) M a i n t a i n f o r p u b l i c i n s p e c t i o n a l l r e c o r d s 
p e r t a i n i n g t o t h e p r o v i s i o n s o f t h i s o r d i n a n c e . 
( 4 ) A l t e r a t i o n o f W a t e r c o u r s e s . 
( a ) N o t i f y a d j a c e n t . c o m m u n i t i e s , t h e O r e g o n D e p a r t m e n t 
o f L a n d C o n s e r v a t i o n a n d D e v e l o p m e n t ( t h e S t a t e ' s " 
N F I P C o o r d i n a t i n g A g e n c y ) , t h e O r e g o n W a t e r . ; 
R e s o u r c e s D e p a r t m e n t , a n d a n y o t h e r a p p r o p r i a t e . . . 
s t a t e a n d f e d e r a l a g e n c i e s , p r i o r t o a n y a l t é r a t i o n 
o r r e l o c a t i o n o f a w a t e r c o u r s e , a n d s u b m i t e v i d e n c e 
o f s u c h n o t i f i c a t i o n t o t h e F e d e r a l I n s u r a n c e 
A d m i n i s t r a t i o n . 
(b) R e q u i r e t h a t m a i n t e n a n c e i s p r o v i d e d w i t h i n t h e 
a l t e r e d o r r e l o c a t e d p o r t i o n o f s a i d w a t e r c o u r s e s o 
t h a t t h e f l o o d c a r r y i n g c a p a c i t y i s n o t d i m i n i s h e d . 
( 5 ) I n t e r p r e t a t i o n o f FIRM B o u n d a r i e s . M a k e i n t e r p r e t a t i o n s 
a n d d e t e r m i n a t i o n s w h e r e n e e d e d , a s t o e x a c t l o c a t i o n o f 
t h e b o u n d a r i e s o f t h e a r e a s o f s p e c i a l f l o o d h a z a r d s ( f o r 
e x a m p l e , w h e r e t h e r e a p p e a r s t o b e a c o n f l i c t b e t w e e n a 
m a p p e d b o u n d a r y a n d a c t u a l f i e l d c o n d i t i o n s ) . I f t h e 
l o c a t i o n o f a b o u n d a r y i s c o n t e s t e d , t h e p e r s o n 
c o n t e s t i n g t h e l o c a t i o n o f t h e b o u n d a r y s h a l l b e g i v e n a 
r e a s o n a b l e o p p o r t u n i t y t o a p p e a l t h e i n t e r p r e t a t i o n o r 
d e t e r m i n a t i o n a s p r o v i d e d i n t h i s a r t i c l e . S u c h a p p e a l s 
s h a l l b e r e v i e w e d c o n s i s t e n t w i t h t h e s t a n d a r d s o f t h i s 
c o d e a n d S e c t i o n 6 0 . 6 o f t h e R u l e s a n d R e g u l a t i o n s o f t h e 
N a t i o n a l F l o o d I n s u r a n c e P r o g r a m ( 4 4 CFR 5 9 - 7 6 ) . 
( 6 ) L o c a t i o n o.f FIRM B o u n d a r i e s a n d E l e v a t i o n s . 
( a ) Make a l l i n f o r m a t i o n r e l a t i n g , t o . t h e 1 0 0 - y e a r f l o o d 
p l a i n a n d f l o o d w a y l o c a t i o n a n d e l e v a t i o n s a v a i l a b l e 
t o t h e a p p l i c a n t , i n c l u d i n g t h e F l o o d I n s u r a n c e 
S t u d y w i t h f l o o d s e c t i o n s , t h e F l o o d I n s u r a n c e R a t e 
M a p s s h o w i n g f l o o d e l e v a t i o n s a n d e l e v a t i o n d a t a 
r e f e r e n c e p o i n t s , a n d o t h e r f l o o d p l a i n d e v e l o p m e n t 
s u r v e y s i n t h e i m m e d i a t e v i c i n i t y . 
( b ) C e r t i f y t h a t t h e l o c a t i o n o f t h e f l o o d w a y a n d 1 0 0 -
y e a r f l o o d p l a i n , , a n d e x i s t i n g a n d p r o p o s e d 
e l e v a t i o n s , h a v e b e e n m a d e f o r t h e a p p l i c a n t b y a 
p r o f e s s i o n a l l a n d s u r v e y o r r e g i s t e r e d i n O r e g o n , a n d 
t h a t t h e s i g n a t u r e a n d s e a l a r e a f f i x e d c e r t i f y i n g 
t h e a c c u r a c y o f" s u c h d e t e r m i n a t i o n . 
( c ) _ C e r t i f y t h a t t h e f i n i s h e d , f l o o r e l e v a t i o n s , a n d 
o t h e r , f i n i s h e d e l e v a t i o n s o f t h e . p r o p o s a l a f f e c t i n g 
t h e f l o o d w a y o r 1 0 0 - y e a r f l o o d p l a i n h a v e b e e n 
c o n s t r u c t e d o r d e v e l o p e d t o . t h e a p p r o v e d , e l e v a t i o n s ' , 
a s c e r t i f i e d b y a r e g i s t e r e d p r o f e s s i o n a l s u r v e y o r 
o v e r , h i s s i g n a t u r e , a n d s e a l . 
( d ) U p o n r e q u e s t , p r o v i d e t h e i n f o r m a t i o n i n t h i s 
S e c t i o n t o t h e a p p l i c a n t , a p p l i c a n t ' s l e n d e r a n d / o r 
i n s u r a n c e a g e n t . . 
(e) . S h o u l d a n a p p l i c a n t p u r s u e a c h a n g e i n f l o o d p l a i n . o r 
. f l o o d w a y d e s i g n a t i o n f r o m t h e F e d e r a l E m e r g e n c y 
- . M a n a g e m e n t A g e n c y , a s s i s t t h e a p p l i c a n t w i t h 
i n f o r m a t i o n a b o u t t h e p r o c e s s . 
1 3 . 2 4 6 V a r i a n c e s . V a r i a n c e s t o t h e p r o v i s i o n s o f t h i s A r t i c l e 
s h a l l b e p r o c e s s e d i n a c c o r d a n c e w i t h t h e p r o c e d u r e s o f 
A r t i c l e 2 a n d t h e p r o v i s i o n s o f A r t i c l e 6 o f t h i s C o d e . 
' A n y v a r i a n c e t o t h e F l o o d H a z a r d p r o v i s i o n s o f t h i s 
A r t i c l e s h a l l i n c l u d e a r e c o m m e n d a t i o n o f t h e C i t y 
E n g i n e e r a s s p e c i f i e d i n S e c t i o n 6 . 0 6 0 ( B ) ( 1 1 ) a n d s h a l l 
a d d r e s s t h e a d d i t i o n a l p r o v i s i o n s o f t h i s S e c t i o n , e x c e p t 
a s p r o v i d e d i n S u b s e c t i o n ( 3 ) o f t h i s S e c t i o n . 
( 1 ) F a c t o r s t o C o n s i d e r . T h e r e v i e w b o d y s h a l l c o n s i d e r a l l -
t e c h n i c a l e v a l u a t i o n s , a l l r e l e v a n t f a c t o r s , a n d 
s t a n d a r d s s p e c i f i e d i n t h i s A r t i c l e , a n d t h e f o l l o w i n g : 
( a ) T h e d a n g e r t h a t m a t e r i a l s m a y b e s w e p t o n t o o t h e r 
l a n d s t o t h e i n j u r y o f o t h e r s ; 
( b ) T h e d a n g e r t o l i f e a n d p r o p e r t y d u e t o f l o o d i n g o r 
e r o s i o n d a m a g e ; 
( c ) T h e s u s c e p t i b i l i t y o f t h e p r o p o s e d f a c i l i t y a n d i t s 
c o n t e n t s t o f l o o d d a m a g e a n d t h e e f f e c t o f s u c h 
d a m a g e o n t h e i n d i v i d u a l o w n e r a n d o c c u p a n t s ; 
( d ) T h e i m p o r t a n c e o f t h e s e r v i c e s p r o v i d e d b y t h e 
p r o p o s e d f a c i l i t y t o t h e c o m m u n i t y ; 
( e ) T h e n e c e s s i t y t o t h e f a c i l i t y o f a w a t e r f r o n t 
l o c a t i o n , w h e r e a p p l i c a b l e ; 
( f ) T h e a v a i l a b i l i t y o f a l t e r n a t i v e l o c a t i o n s f o r t h e 
p r o p o s e d u s e w h i c h a r e n o t s u b j e c t t o f l o o d i n g o r 
e r o s i o n d a m a g e ; 
( g ) T h e c o m p a t i b i l i t y o f t h e p r o p o s e d u s e w i t h e x i s t i n g 
• a n d a n t i c i p a t e d d e v e l o p m e n t ; 
( h ) T h e r e l a t i o n s h i p o f t h e p r o p o s e d u s e t o t h e 
c o m p r e h e n s i v e p l a n a n d f l o o d p l a i n m a n a g e m e n t 
p r o g r a m ; 
( i ) T h e s a f e t y o f a c c e s s t o t h e p r o p e r t y i n t i m e s o f 
f l o o d f o r o r d i n a r y a n d e m e r g e n c y v e h i c l e s ; 
( j ) T h e e x p e c t e d h e i g h t s , . v e l o c i t y , d u r a t i o n , r a t e o f 
• r i s e , a n d s e d i m e n t t r a n s p o r t o f t h e f l o o d . w a t e r s a n d 
T t h e e f f e c t s o f . w a v e a c t i o n , i f a p p l i c a b l e , e x p e c t e d 
a t t h e s i t e ; a n d 
( k ) T h e c o s t s o f p r o v i d i n g g o v e r n m e n t a l s e r v i c e s d u r i n g 
a n d a f t e r f l o o d c o n d i t i o n s , i n c l u d i n g m a i n t e n a n c e 
. a n d r e p a i r o f p u b l i c u t i l i t i e s a n d f a c i l i t i e s s u c h 
a s s e w e r , g a s , e l e c t r i c a l , a n d w a t e r s y s t e m s , a n d 
s t r e e t s ' a n d b r i d g e s . 
( 2 ) • A d d i t i o n a l G u i d e l i n e s a n d R e q u i r e m e n t s f o r V a r i a n c e s t o 
t h e P r o v i s i o n s o f t h i s A r t i c l e . I n a d d i t i o n t o t h e 
v a r i a n c e c r i t e r i a i n A r t i c l e 6 , t h e r e v i e w b o d y s h a l l 
a d d r e s s t h e p r o v i s i o n s , o f t h i s S e c t i o n . 
( a ) G e n e r a l l y , t h e o n l y c o n d i t i o n u n d e r w h i c h a v a r i a n c e 
f r o m t h e e l e v a t i o n s t a n d a r d m a y b e i s s u e d i s f o r n e w 
c o n s t r u c t i o n a n d s u b s t a n t i a l i m p r o v e m e n t s t o b e 
e r e ^ c e d o n a l o t o f o n e - h a l f ac_i_e o r l e s s i n s i z e 
c o n t i g u o u s t o a n d s u r r o u n d e d b y l o t s w i t h e x i s t i n g 
s t r u c t u r e s c o n s t r u c t e d b e l o w t h e b a s e f l o o d l e v e l , 
p r o v i d i n g t h e i t e m s i n S u b s e c t i o n ( 1 ) o f t h i s 
S e c t i o n h a v e b e e n f u l l y c o n s i d e r e d . A s t h e l o t s i z e 
i n c r e a s e s , t h e t e c h n i c a l j u s t i f i c a t i o n r e q u i r e d f o r 
i s s u i n g t h e v a r i a n c e i n c r e a s e s . 
(b ) V a r i a n c e s s h a l l n o t b e i s s u e d w i t h i n a d e s i g n a t e d 
f l o o d w a y i f a n y i n c r e a s e i n f l o o d l e v e l s d u r i n g t h e 
b a s e f l o o d d i s c h a r g e w o u l d r e s u l t . 
( c ) V a r i a n c e s s h a l l o n l y b e i s s u e d u p o n a d e t e r m i n a t i o n 
t h a t t h e v a r i a n c e i s t h e m i n i m u m n e c e s s a r y , 
c o n s i d e r i n g t h e f l o o d h a z a r d , t o a f f o r d r e l i e f . 
(d ) V a r i a n c e s t o t h e p r o v i s i o n s o f t h i s A r t i c l e s h a l l 
o n l y b e i s s u e d u p o n f i n d i n g s o f : 
( i ) A s h o w i n g o f g o o d a n d - s u f f i c i e n t c a u s e ; 
( i i ) A d e t e r m i n a t i o n t h a t f a i l u r e t o g r a n t t h e 
v a r i a n c e w o u l d r e s u l t i n e x c e p t i o n a l h a r d s h i p 
t o t h e a p p l i c a n t ; 
( i i i ) A d e t e r m i n a t i o n t h a t t h e g r a n t i n g o f t h e 
v a r i a n c e w i l l n o t r e s u l t i n i n c r e a s e d f l o o d 
h e i g h t s , a d d i t i o n a l t h r e a t s t o p u b l i c s a f e t y , 
o r e x t r a o r d i n a r y p u b l i c e x p e n s e ; c r e a t e 
n u i s a n c e s ; c a u s e f r a u d o n o r v i c t i m i z a t i o n o f 
t h e p u b l i c i n c o n s i d e r a t i o n o f t h e f a c t o r s o f 
S u b s e c t i o n ( 1 ) o f t h i s S e c t i o n ; o r c o n f l i c t 
w i t h e x i s t i n g l o c a l l a w s o r o r d i n a n c e s . 
. ' ( e ) V a r i a n c e s a s i n t e r p r e t e d i n t h e N a t i o n a l F l o o d 
I n s u r a n c e P r o g r a m a r e b a s e d o n t h e g e n e r a l z o n i n g 
l a w p r i n c i p l e t h a t t h e y , p e r t a i n t o a p h y s i c a l p i e c e 
o f p r o p e r t y ; t h e y a r e n o t p e r s o n a l i n n a t u r e a n d d o 
.-.- n o t p e r t a i n t o t h e s t r u c t u r e , . i t s i n h a b i t a n t s , 
e c o n o m i c o r f i n a n c i a l c i r c u m s t a n c e s . T h e y p r i m a r i l y 
a d d r e s s s m a l l l o t s i n d e n s e l y p o p u l a t e d r e s i d e n t i a l 
. n e i g h b o r h o o d s . A s s u c h , v a r i a n c e s f r o m t h e f l o o d 
e l e v a t i o n s s h o u l d b e q u i t e r a r e . 
( f ) V a r i a n c e s m a y b e i s s u e d f o r n o n - r e s i d e n t i a l 
b u i l d i n g s i n v e r y l i m i t e d c i r c u m s t a n c e s t o a l l o w a 
l e s s e r d e g r e e o f f l o o d - p r o o f i n g t h a n w a t e r t i g h t o r 
•: d r y - p r o o f i n g , w h e r e . . i t c a n . b e d e t e r m i n e d t h a t s u c h 
a c t i o n w i l l h a v e l o w d a m a g e p o t e n t i a l s c o m p l y w i t h 
a l l o t h e r p r o v i s i o n s o f t h i s S u b s e c t i o n o t h e r t h a n 
( a ) , a n d o t h e r w i s e c o m p l y w i t h t h e p r o v i s i o n s o f 
S e c t i o n 1 3 . 2 5 2 ( A n c h o r i n g ) a n d 1 3 . 2 5 3 (AH Z o n e 
D r a i n a g e ) . 
( 3 ) E x c e p t i o n s i o r H i s t o r i c P r o p e r t i e s . V a r i a n c e s may b e 
i s s u e d f o r t h e r e c o n s t r u c t i o n , r e h a b i l i t a t i o n , o r 
r e s t o r a t i o n o f s t r u c t u r e s l i s t e d o n t h e N a t i o n a l R e g i s t e r 
o f H i s t o r i c P l a c e s o r t h e S t a t e w i d e I n v e n t o r y o f H i s t o r i c 
P r o p e r t i e s i n a c c o r d a n c e w i t h A r t i c l e 6 , w i t h o u t r e g a r d 
t o t h e a d d i t i o n a l p r o v i s i o n s o f S u b s e c t i o n s ( 1 ) a n d ( 2 ) 
o f t h i s S e c t i o n . I n s u c h c a s e , t h e v a r i a n c e s h a l l b e 
p a r t o f t h e r e v i e w a n d a p p r o v a l b y t h e H i s t o r i c B u i l d i n g s 
a n d S i t e s C o m m i s s i o n r e q u i r e d i n A r t i c l e 1 3 . 4 0 0 o f t h i s 
C o d e . I n a d d i t i o n : 
"(a) S u c h v a r i a n c e s s h a l l b e o n l y t h e m i n i m u m d e v i a t i o n 
f r o m N F I P c r i t e r i a t h a t i s n e c e s s a r y t o a s s u r e t h a t 
t h e h i s t o r i c c h a r a c t e r a n d d e s i g n i s n o t d e - s t r o y e d ; 
a n d 
(b ) T h e v a r i a n c e m u s t n o t p r e c l u d e t h e c o n t i n u e d 
d e s i g n a t i o n o f t h e s t r u c t u r e a s a n h i s t o r i c 
s t r u c t u r e . 
A n y m e a s u r e s t h a t c a n b e t a k e n t o r e d u c e f u t u r e f l o o d 
d a m a g e c o n s i s t e n t w i t h t h i s S u b s e c t i o n s h a l l b e r e q u i r e d , 
s u c h a s e l e v a t i n g a n a i r c o n d i t i o n e r o r u s i n g f l o o d -
r e s i s t a n t m a t e r i a l s . 
( 4 ) C o n d i t i o n s A t t a c h e d t o V a r i a n c e s . U p o n c o n s i d e r a t i o n o f 
t h e f a c t o r s i n S u b s e c t i o n ( 1 ) a n d t h e p u r p o s e s o f t h i s 
C o d e a n d A r t i c l e , i f a v a r i a n c e i s g r a n t e d , t h e r e v i e w 
b o d y m a y a t t a c h c o n d i t i o n s t o t h e v a r i a n c e a s i t d e e m s 
n e c e s s a r y t o f u r t h e r t h e p u r p o s e s o f t h i s C o d e . 
( 5 ) N o t i f i c a t i o n o f E f f e c t o n F l o o d I n s u r a n c e R a t e s . A n y 
a p p l i c a n t t o whom a v a r i a n c e - i s g r a n t e d s h a l l b e g i v e n 
w r i t t e n n o t i c e t h a t t h e s t r u c t u r e w i l l b e p e r m i t t e d t o be . 
b u i l t w i t h a l o w e s t f l o o r e l e v a t i o n b e l o w t h e b a s e f l o o d 
e l e v a t i o n a n d t h a t t h e c o s t o f f l o o d i n s u r a n c e w i l l b e 
c o m m e n s u r a t e w i t h t h e i n c r e a s e d r . i s k r e s u l t i n g f r o m t h e 
r e d u c e d f l o o r e l e v a t i o n . 
( 6 ) R e c o r d - K e e p i n g . T h e D i r e c t o r s h a l l m a i n t a i n t h e r e c o r d s 
o f a l l v a r i a n c e s a n d s h a l l r e p o r t a n y v a r i a n c e s t o t h e 
F e d e r a l I n s u r a n c e A d m i n i s t r a t i o n u p o n r e q u e s t . 
1 3 . 2 4 7 A p p e a l s . A p p e a l s t o i n t e r p r e t a t i o n s o f t h e . p r o v i s i o n s o f 
t h i s A r t i c l e o r d e t e r m i n a t i o n s r e g a r d i n g t h e a p p l i c a t i o n 
o f t h e p r o v i s i o n s o f t h i s A r t i c l e s h a l l b e u n d e r t a k e n i n 
a s p r o v i d e d i n A r t i c l e 1 0 o f t h i s C o d e . T h e D i r e c t o r 
s h a l l m a i n t a i n t h e r e c o r d s o f a l l a p p e a l a c t i o n s a n d 
s h a l l r e p o r t a n y a p p e a l a c t i o n s t o t h e F e d e r a l I n s u r a n c e 
A d m i n i s t r a t i o n u p o n r e q u e s t . 
1 3 . 2 5 0 P r o v i s i o n f o r F l o o d H a z a r d R e d u c t i o n . 
1 3 . 2 5 1 G e n e r a l S t a n d a r d s . I n a l l a r e a s o f s p e c i a l f l o o d 
h a z a r d s , t h e s t a n d a r d s s e t f o r t h i n t h i s A r t i c l e a r e 
r e q u i r e d . 
1 3 . 2 5 2 A n c h o r i n g . 
( 1 ) A l l n e w c o n s t r u c t i o n a n d s u b s t a n t i a l i m p r o v e m e n t s s h a l l 
b e a n c h o r e d t o p r e v e n t f l o t a t i o n , c o l l a p s e , o r l a t e r a l 
m o v e m e n t o f t h e s t r u c t u r e . 
(.2) A l l m a n u f a c t u r e d h o m e s s h a l l l i k e w i s e b e a n c h o r e d t o 
p r e v e n t f l o t a t i o n , c o l l a p s e o r l a t e r a l m o v e m e n t , a n d 
s h a l l b e i n s t a l l e d u s i n g m e t h o d s a n d p r a c t i c e s t h a t . 
m i n i m i z e f l o o d d a m a g e . A n c h o r i n g m e t h o d s may i n c l u d e , 
b u t a r e n o t l i m i t e d t o , u s e o f o v e r - t h e - t o p o r f r a m e t i e s 
t o g r o u n d a n c h o r s ( R e f e r e n c e F E M A ' s " M a n u f a c t u r e d Home 
I n s t a l l a t i o n i n F l o o d H a z a r d A r e a s " g u i d e b o o k f o r 
a d d i t i o n a l t e c h n i q u e s ) . 
AH Z o n e D r a i n a g e . A d e q u a t e d r a i n a g e p a t h s a r e r e q u i r e d 
o n s l o p e s t o g u i d e f l o o d w a t e r s a r o u n d a n d a w a y f r o m 
p r o p o s e d s t r u c t u r e s . 
C o n s t r u c t i o n M a t e r i a l s a n d M e t h o d s . 
( 1 ) A l l n e w c o n s t r u c t i o n a n d s u b s t a n t i a l i m p r o v e m e n t s s h a l l 
b e c o n s t r u c t e d w i t h m a t e r i a l s a n d u t i l i t y e q u i p m e n t 
r e s i s t a n t t o f l o o d d a m a g e . 
( 2 ) A l l n e w c o n s t r u c t i o n a n d s u b s t a n t i a l i m p r o v e m e n t s s h a l l 
b e c o n s t r u c t e d u s i n g m e t h o d s a n d p r a c t i c e s t h a t m i n i m i z e 
f l o o d d a m a g e . . 
( 3 ) E l e c t r i c a l , h e a t i n g , v e n t i l a t i o n , p l u m b i n g , a n d a i r 
c o n d i t i o n i n g e q u i p m e n t : a h d o t h e r s e r v i c e , f a c i l i t i e s s h a l l -
b e d e s i g n e d a n d / o r o t h e r w i s e , e l e v a t e d o r l o c a t e d s o a s t o 
p r e v e n t w a t e r f r o m e n t e r i n g o r a c c u m u l a t i n g w i t h i n t h e 
c o m p o n e n t s d u r i n g c o n d i t i o n s o f f l o o d i n g . 
1 3 . 2 5 5 U t i l i t i e s and- S e r v i c e s . 
( 1 ) A l l n e w a n d r e p l a c e m e n t w a t e r s u p p l y s y s t e m s . s h a l l b e . 
d e s i g n e d t o m i n i m i z e o r e l i m i n a t e i n f i l t r a t i o n o f 
f l o o d w a t e r s i n t o t h e s y s t e m ; . 
(.2) New a n d r e p l a c e m e n t s a n i t a r y s e w a g e s y s t e m s s h a l l b e 
d e s i g n e d t o m i n i m i z e o r e l i m i n a t e i n f i l t r a t i o n o f 
f l o o d w a t e r s i n t o t h e s y s t e m s a n d d i s c h a r g e f r o m t h e . 
s y s t e m s i n t o f l o o d w a t e r s ; 
1 3 . 2 5 3 
1 3 . 2 5 4 
( 3 ) O n - s i t e w a s t e d i s p o s a l s y s t e m s s h a l l b e l o c a t e d t o a v o i d 
i m p a i r m e n t t o t h e m o r c o n t a m i n a t i o n f r o m t h e m d u r i n g 
f l o o d i n g c o n s i s t e n t w i t h t h e r e q u i r e m e n t s o f t h e O r e g o n 
D e p a r t m e n t o f E n v i r o n m e n t a l Q u a l i t y ; 
1 3 . 2 5 6 S u b d i v i s i o n a n d D e v e l o p m e n t P r o p o s a l s , P a r t i t i o n s , a n d 
P l a n n e d U n i t D e v e l o p m e n t s . 
No p r o p o s e d s u b d i v i s i o n o r p a r t i t i o n o f l a n d o r p l a n n e d 
u n i t d e v e l o p m e n t p l a n , o r o t h e r d e v e l o p m e n t l o c a t e d 
w i t h i n a n a r e a o f s p e c i a l f l o o d h a z a r d s h a l l b e a p p r o v e d 
w i t h o u t m e e t i n g t h e r e q u i r e m e n t s o f t h i s a r t i c l e . A l l o f 
t h e a p p l i c a b l e m a p p i n g a n d c e r t i f i c a t i o n r e q u i r e m e n t s o f 
t h i s a r t i c l e s h a l l b e m e t a t t h e T e n t a t i v e . M a p , P l a t o r 
P l a n s t a g e o f r e v i e w f o r s u b d i v i s i o n s , p a r t i t i o n s , a n d 
p l a n n e d u n i t d e v e l o p m e n t s ( S e e a l s o A r t i c l e 1 7 , L o t s a n d 
C r e a t i o n o f L o t s , a n d A r t i c l e 1 8 , P l a n n e d U n i t 
D e v e l o p m e n t . ) 
( 1 ) A l l d e v e l o p m e n t p r o p o s a l s , i n c l u d i n g s u b d i v i s i o n 
p r o p o s a l s , s h a l l b e c o n s i s t e n t w i t h t h e n e e d t o m i n i m i z e 
f l o o d d a m a g e ; 
( 2 ) A l l d e v e l o p m e n t p r o p o s a l s , i n c l u d i n g s u b d i v i s i o n 
p r o p o s a l s , s h a l l h a v e p u b l i c u t i l i t i e s a n d f a c i l i t i e s 
s u c h a s s e w e r , g a s , e l e c t r i c a l , a n d w a t e r s y s t e m s l o c a t e d 
a n d c o n s t r u c t e d t o m i n i m i z e o r e l i m i n a t e f l o o d d a m a g e ; 
( 3 ) A l l d e v e l o p m e n t p r o p o s a l s , i n c l u d i n g s u b d i v i s i o n 
p r o p o s a l s , s h a l l h a v e a d e q u a t e d r a i n a g e p r o v i d e d t o 
r e d u c e e x p o s u r e t o f l o o d d a m a g e ; a n d 
( 4 ) W h e r e b a s e f l o o d e l e v a t i o n d a t a h a s n o t b e e n p r o v i d e d o r 
i s riot a v a i l a b l e f r o m a n o t h e r a u t h o r i t a t i v e s o u r c e , i t 
s h a l l b e g e n e r a t e d f o r d e v e l o p m e n t . p r o p o s a l s , i n c l u d i n g 
s u b d i v i s i o n p r o p o s a l s , w h i c h h a v e t h e p o t e n t i a l f o r 5 
d w e l l i n g u n i t s o r m o r e o r c o n t a i n 1 a c r e o r m o r e , 
w h i c h e v e r i s l e s s . 
1 3 . 2 5 7 R e v i e w W h e r £ E l e v a t i o n D a t a N o t A v a i l a b l e . W h e r e 
e l e v a t i o n d a t a i s n o t a v a i l a b l e t h r o u g h t h e F l o o d 
I n s u r a n c e S t u d y FIRM, o r a n o t h e r a u t h o r i t a t i v e s o u r c e , 
a p p l i c a t i o n s f o r b u i l d i n g p e r m i t s s h a l l b e r e v i e w e d t o 
a s s u r e t h a t p r o p o s e d c o n s t r u c t i o n w i l l b e r e a s o n a b l y s a f e 
• f r o m f l o o d i n g . T h e t e s t o f r e a s o n a b l e n e s s i s a l o c a l 
j u d g m e n t a n d i n c l u d e s u s e o f h i s t o r i c a l d a t a , h i g h w a t e r 
m a r k s , p h o t o g r a p h s o f p a s t f l o o d i n g , e t c . . , w h e r e 
a v a i l a b l e . F a i l u r e t o e l e v a t e t h e l o w e s t f l o o r a t l e a s t 
t w o f e e t a b o v e g r a d e i n t h e s e z o n e s m a y r e s u l t i n h i g h e r 
i n s u r a n c e r a t e s . 
1 3 . 2 6 0 S p e c i f i c S t a n d a r d s . 
I n a l l a r e a s o f s p e c i a l f l o o d h a z a r d s w h e r e b a s e f l o o d 
e l e v a t i o n d a t a h a s b e e n , p r o v i d e d ( Z o n e s A l - 3 0 , AH, a n d 
AE) a s s e t f o r t h i n S e c t i o n 1 3 . 2 3 2 ( B a s i s f o r 
E s t a b l i s h i n g t h e A r e a s o f S p e c i a l F l o o d H a z a r d ) o r 
S e c t i o n 1 3 . 2 4 5 ( 2 ) ( U s e o f O t h e r B a s e F l o o d D a t a ) , t h e 
f o l l o w i n g p r o v i s i o n s a r e r e q u i r e d . 
1 3 . 2 6 1 , R e s i d e n t i a l C o n s t r u c t i o n . 
( 1 ) New c o n s t r u c t i o n a n d s u b s t a n t i a l i m p r o v e m e n t o f a n y 
r e s i d e n t i a l s t r u c t u r e s h a l l h a v e t h e l o w e s t f l o o r , 
i n c l u d i n g b a s e m e n t , e l e v a t e d t o a m i n i m u m o f o n e f o o t 
a b o v e t h e b a s e f l o o d e l e v a t i o n . 
( 2 ) F u l l y e n c l o s e d a r e a s b e l o w t h e l o w e s t f l o o r t h a t a r e 
s u b j e c t t o f l o o d i n g a r e p r o h i b i t e d , o r s h a l l b e d e s i g n e d 
t o a u t o m a t i c a l l y e q u a l i z e h y d r o s t a t i c f l o o d f o r c e s o n 
e x t e r i o r w a l l s , b y a l l o w i n g f o r t h e e n t r y a n d e x i t o f 
f l o o d w a t e r s . D e s i g n s f o r m e e t i n g t h i s r e q u i r e m e n t m u s t 
e i t h e r b e c e r t i f i e d b y a r e g i s t e r e d p r o f e s s i o n a l e n g i n e e r 
o r a r c h i t e c t o r m u s t m e e t o r e x c e e d t h e f o l l o w i n g m i n i m u m 
c r i t e r i a : 
- ( a ) A m i n i m u m o f t w o o p e n i n g s h a v i n g a t o t a l n e t a r e a o f 
n o t l e s s t h a n o n e s q u a r e i n c h f o r e v e r y s q u a r e f o o t 
o f e n c l o s e d a r e a s u b j e c t t o f l o o d i n g s h a l l p r o v i d e d . 
( b ) T h e b o t t o m o f a l l o p e n i n g s s h a l l b e n o h i g h e r t h a n 
o n e f o o t . a b o y e g r a d e . 
, ( c ) O p e n i n g s m a y b e e q u i p p e d w i t h s c r e e n s , l o u v e r s , o r 
' o t h e r c o v e r i n g s o r d e v i c e s p r o v i d e d t h a t t h e y p e r m i t 
t h e a u t o m a t i c e n t r y a n d e x i t o f f l o o d w a t e r s . 
1 3 . 2 6 2 N o n - R e s i d e n t i a l C o n s t r u c t i o n . 
( 1 ) New c o n s t r u c t i o n a n d s u b s t a n t i a l i m p r o v e m e n t o f a n y 
c o m m e r c i a l , i n d u s t r i a l o r o t h e r n o n - r e s i d e n t i a l s t r u c t u r e 
^ s h a l l e i t h e r h a v e t h e l o w e s t f l o o r , i n c l u d i n g , b a s e m e n t , 
e l e v a t e d t o a m i n i m u m o f o n e f o o t a b o v e t h e b a s e f l o o d 
e l e v a t i o n ; : o r , t o g e t h e r w i t h a t t e n d a n t u t i l i t y a n d 
•. s a n i t a r y f a c i l i t i e s , s h a l l : 
( a ) B e f l o o d p r o o f e d s o t h a t t h e . s t r u c t u r e i s w a t e r t i g h t , 
w i t h w a l l s s u b s t a n t i a l l y i m p e r m e a b l e t o t h e p a s s a g e 
o f w a t e r t o a l e v e l o f o n e f o o t a b o v e t h e b a s e f l o o d 
e l e v a t i o n ; 
( b ) H a v e s t r u c t u r a l c o m p o n e n t s c a p a b l e o f r e s i s t i n g 
h y d r o s t a t i c a n d h y d r o d y n a m i c l o a d s a n d e f f e c t s o f 
b u o y a n c y ; a n d 
( c ) B e c e r t i f i e d b y a r e g i s t e r e d p r o f e s s i o n a l e n g i n e e r 
o r a r c h i t e c t t h a t t h e d e s i g n a n d m e t h o d s o f 
c o n s t r u c t i o n a r e i n a c c o r d a n c e w i t h a c c e p t e d 
s t a n d a r d s o f p r a c t i c e f o r m e e t i n g p r o v i s i o n s o f t h i s 
s e c t i o n b a s e d o n t h e i r d e v e l o p m e n t a n d / o r r e v i e w o f 
t h e s t r u c t u r a l d e s i g n , s p e c i f i c a t i o n s a n d p l a n s . 
S u c h c e r t i f i c a t i o n s s h a l l a l s o p r o v i d e t h a t t h e 
p r o v i s i o n s o f 1 3 . 2 5 4 a r e s a t i s f i e d . S u c h 
c e r t i f i c a t i o n s s h a l l b e p r o v i d e d t o t h e D i r e c t o r a s 
s e t f o r t h i n S e c t i o n 1 3 . 2 4 5 ( 3 ) (b ) . 
T h e c e r t i f i c a t i o n b y a r e g i s t e r e d p r o f e s s i o n a l 
e n g i n e e r o r a r c h i t e c t s h a l l s p e c i f y t h a t t h e 
f l o o d p r o o f e d m e t h o d s f o r a n y c o m m e r c i a l o r 
i n d u s t r i a l s t r u c t u r e a r e a d e q u a t e t o w i t h s t a n d t h e 
f l o o d d e p t h s , p r e s s u r e s v e l o c i t i e s f i m p a c t s a n d 
u p l i f t f o r c e s a n d o t h e r f a c t o r s a s s o c i a t e d w i t h t h e 
b a s e f l o o d . 
( 2 ) N o n - r e s i d e n t i a l s t r u c t u r e s t h a t a r e e l e v a t e d , n o t 
f l o o d p r o o f e d , m u s t m e e t t h e s a m e s t a n d a r d s f o r s p a c e 
b e l o w t h e l o w e s t f l o o r a s d e s c r i b e d i n S e c t i o n 1 3 . 2 6 1 ( 2 ) . 
( 3 ) A p p l i c a n t s f l o o d p r o o f i n g n o n - r e s i d e n t i a l b u i l d i n g s s h a l l 
b e n o t i f i e d t h a t f l o o d i n s u r a n c e p r e m i u m s - w i l l b e b a s e d 
. o n r a t e s t h a t a r e o n e f o o t b e l o w t h e f l o o d p r o o f e d l e v e l 
( e . g . a b u i l d i n g f l o o d p r o o f e d t o t h e b a s e f l o o d l e v e l 
w i l l b e r a t e d a s o n e f o o t b e l o w t h a t l e v e l ) " . 
1 3 . - 2 6 3 M a n u f a c t u r e d H o m e s . 
( 1 ) A l l m a n u f a c t u r e d h o m e s t o b e p l a c e d o r s u b s t a n t i a l l y 
i m p r o v e d o n s i t e s l i s t e d b e l o w s h a l l b e e l e v a t e d o n a 
p e r m a n e n t f o u n d a t i o n s u c h t h a t t h e f i n i s h e d f l o o r o f t h e 
m a n u f a c t u r e d h o m e i s e l e v a t e d t o a m i n i m u m o f 1 8 i n c h e s 
( 4 6 cm) a b o v e t h e b a s e f l o o d e l e v a t i o n a n d b e s e c u r e l y 
a n c h o r e d t o a n a d e q u a t e l y d e s i g n e d f o u n d a t i o n s y s t e m t o 
r e s i s t f l o t a t i o n , c o l l a p s e , a n d l a t e r a l m o v e m e n t : 
{NOTE: S e e 2 0 0 2 O r e g o n M a n u f a c t u r e d D w e l l i n g a n d P a r k s 
S p e c i a l t y C o d e , C h a p t e r 3 Manufactured Dwelling 
Installations a n d C h a p t e r 1 0 Manufactured Dwelling Park 
Construction. T h a t c o d e a l s o i n c l u d e s t h e f o l l o w i n g 
p r o v i s i o n s : 3 - 2 . 4 . 1 . ( b ) 1 r e q u i r e s t h a t t h e t o p o f t h e 
d w e l l i n g s t a n d b e a t l e a s t o n e f o o t a b o v e b a s e f l o o d 
e l e v a t i o n u n l e s s o p e n i n g s a r e p r o v i d e d p e r FEMA T e c h n i c a l . 
• B u l l e t i n 1 - 9 3 . 1 0 - 2 / 2 ( d ) s p e c i f i e s t h a t m a n u f a c t u r e d 
d w e l l i n g p a r k s o r p a r k e x p a n s i o n s s h a l l n o t b e p e r m i t t e d 
i n a f l o ^ d h a z a r d a r e a u n l e s s t h e s i a n d s a r e e l e v a t e d 
a b o v e t h e b a s e f l o o d e l e v a t i o n ) . 
( a ) O u t s i d e o f a m a n u f a c t u r e d h o m e p a r k o r m a n u f a c t u r e d 
home s u b d i v i s i o n ; 
( b ) I n a n e w m a n u f a c t u r e d h o m e p a r k o r m a n u f a c t u r e d h o m e 
s u b d i v i s i o n ; 
( c ) I n a n e x p a n s i o n t o a n e x i s t i n g m a n u f a c t u r e d h o m e 
p a r k o r m a n u f a c t u r e d h o m e s u b d i v i s i o n ; 
( d ) I n a n e x i s t i n g m a n u f a c t u r e d h o m e p a r k o r 
m a n u f a c t u r e d h o m e s u b d i v i s i o n o n w h i c h a 
m a n u f a c t u r e d h o m e h a s i n c u r r e d " s u b s t a n t i a l d a m a g e " 
a s t h e r e s u l t o f a f l o o d . 
( 2 ) M a n u f a c t u r e d h o m e s t o b e . p l a c e d o r s u b s t a n t i a l l y i m p r o v e d 
o n s i t e s , i n . a n e x i s t i n g m a n u f a c t u r e d h o m e p a r k o r 
m a n u f a c t u r e d h o m e s u b d i v i s i o n w i t h i n Z o n e s A l - 3 0 , AH, a n d 
AE o n t h e c o m m u n i t y ' s FIRM t h a t a r e n o t s u b j e c t t o t h e 
a b o v e m a n u f a c t u r e d h o m e p r o v i s i o n s s h a l l b e e l e v a t e d s o 
t h a t e i t h e r : 
( a ) T h e f i n i s h e d f l o o r o f t h e m a n u f a c t u r e d h o m e i s 
e l e v a t e d t o a m i n i m u m o f 1 8 i n c h e s (4 6 cm) a b o v e t h e 
b a s e f l o o d e l e v a t i o n ; o r 
( b ) T h e m a n u f a c t u r e d h o m e c h a s s i s i s s u p p o r t e d b y 
r e i n f o r c e d p i e r s o r o t h e r f o u n d a t i o n , e l e m e n t s Of a t 
l e a s t e q u i v a l e n t s t r e n g t h t h a t a r e n o l e s s t h a n 3 6 
i n c h e s i n . h e i g h t a b o v e g r a d e a n d b e s e c u r e l y 
a n c h o r e d t o a n a d e q u a t e l y d e s i g n e d f o u n d a t i o n s y s t e m 
t o r e s i s t f l o t a t i o n , c o l l a p s e , a n d l a t e r a l m o v e m e n t . 
1 3 . 2 6 4 / : R e c r e a t i o n a l V . c h i c l e s . t A n y r e c r e a t i o n a l v e h i c l e p l a c e d 
o n ,a s i t e w i t h i n Z o n e s A l - 3 0 , ; AH, AE s h a l l e i t h e r : 
(-1J b e o n t h e . s i t e f o r f e w e r t h a n 180- c o n s e c u t i v e d a y s ; 
(2). b e f u l l y l i c e n s e d a n d r e a d y f o r h i g h w a y u s e , , o n i t s . 
w h e e l s o r j a c k i n g s y s t e m , a t t a c h e d t o t h e s i t e o n l y b y 
q u i c k d i s c o n n e c t t y p e u t i l i t i e s a n d s e c u r i t y d e v i c e s , 
w i t h n o p e r m a n e n t l y a t t a c h e d . a d d i t i o n s ; 
, ( 3 ) . m e e t t h e r e q u i r e m e n t s o f 1 2 . 2 - 6 3 a b o v e a n d t h e e l e v a t i o n 
a n d a n c h o r i n g r e q u i r e m e n t s f o r m a n u f a c t u r e d h o m e s ; o r 
(-4) b e s t o r e d w i t h i n a f u l l y , e n c l o s e d b u i l d i n g t h a t i s 
f l o o d p r o o f e d o r e l e v a t e d I n a c c o r d a n c e w i t h t h e 
r e q u i r e m e n t s o f S e c t i o n 1 3 . 2 6 2 . 
N o t h i n g i n t h e S e c t i o n i s i n t e n d e d t o a u t h o r i z e t h e u s e 
o f a r e c r e a t i o n a l v e h i c l e i n a m a n n e r o t h e r w i s e 
p r o h i b i t e d b y t h i s C o d e o r o t h e r l a w s . 
1 3 . 2 6 5 C r a w l s p a c e s a n d B e l o w - G r a d e C r a w l s p a c e s . A t - g r a d e 
c r a w l s p a c e s a r e t h e p r e f e r r e d m e t h o d o f c r a w l s p a c e 
c o n s t r u c t i o n w i t h i n f l o o d h a z a r d a r e a s . H o w e v e r , b e l o w -
g r a d e c r a w l s p a c e s a r e p e r m i t t e d , a n d a r e n o t c o n s i d e r e d 
b a s e m e n t s , i f a l l o f t h e f o l l o w i n g a r e s a t i s f i e d . See 
Figures 13-1, 13-2 and 13-3. 
O t h e r w i s e , b e l o w - g r a d e c r a w l s p a c e s a r e c o n s i d e r e d 
b a s e m e n t s a n d s u b j e c t t o a p p l i c a b l e r e q u i r e m e n t s f o r 
b a s e m e n t s . A b a s e m e n t f l o o r i s c o n s i d e r e d t h e l o w e s t 
f l o o r { s e e d e f i n i t i o n ) a n d m u s t m e e t r e q u i r e m e n t s f o r t h e 
l o w e s t f l o o r . 
( 1 ) E x c e p t a s p r o v i d e d i n t h i s p a r a g r a p h , b e c a u s e o f 
h y d r o d y n a m i c l o a d s , t h e v e l o c i t y o f f l o o d w a t e r s a t t h e 
s i t e s h a l l n o t e x c e e d 5 f e e t p e r s e c o n d w h e r e a b e l o w -
g r a d e c r a w l s p a c e i s u s e d . F o r v e l o c i t i e s i n e x c e s s o f 5 
f e e t p e r s e c o n d , o t h e r f o u n d a t i o n t y p e s s h a l l b e u s e d , o r 
t h e d e s i g n s h a l l b e a p p r o v e d a n d s t a m p e d b y a q u a l i f i e d 
r e g i s t e r e d a r c h i t e c t o r p r o f e s s i o n a l e n g i n e e r . O t h e r 
t y p e s o f f o u n d a t i o n s a r e r e c o m m e n d e d f o r t h e s e a r e a s . 
T h e d e t e r m i n a t i o n o f v e l o c i t y s h a l l be^ b a s e d o n t h e m e a n 
f l o o d w a y v e l o c i t y i n T a b l e 6 o f t h e F l o o d I n s u r a n c e S t u d y 
f o r J o s e p h i n e C o u n t y a n d I n c o r p o r a t e d A r e a s w i t h a 
D e c e m b e r 3 , 2 0 0 9 e f f e c t i v e d a t e w h e r e t h a t i n f o r m a t i o n i s 
a v a i l a b l e . 
I n a r e a s w h e r e t h e m e a n f l o o d w a y v e l o c i t y m a y e x c e e d 5 
f e é t p e r s e c o n d a n d f l o o d v e l o c i t y i n f o r m a t i o n i s n o t 
a v a i l a b l e , s u c h a s f o r t h e f l o o d w a y f r i n g e , f l o o d 
v e l o c i t y a t t h e b u i l d i n g s i t e s h a l l b e d e t e r m i n e d b y a n 
e n g i n e e r k n o w l e d g e a b l e i n h y d r a u l i c s a n d h y d r o l o g y w h o i s 
q u a l i f i e d t o d e t e r m i n e f l o o d v e l o c i t i e s a t t h e b u i l d i n g 
s i t é , u n l e s s t h e B u i l d i n g O f f i c i a l d e t e r m i n e s f l o o d 
v e l o c i t i e s a t t h e b u i l d i n g s i t e d o n o t e x c e e d 5 f e e t p e r 
s e c o n d b a s e d o n a c c e p t e d p r a c t i c e s o r p r e s u m p t i v e 
d e t e r m i n a t i o n s i n a c c o r d a n c e w i t h N F I P s t a n d a r d s . 
( 2 ) T h e b u i l d i n g m u s t b e d e s i g n e d a n d a d e q u a t e l y a n c h o r e d t o 
r e s i s t o r e l i m i n a t e f l o t a t i o n , c o l l a p s e , a n d l a t e r a l 
m o v e m e n t o f t h e s t r u c t u r e r e s u l t i n g f r o m h y d r o d y n a m i c a n d 
h y d r o s t a t i c l o a d s , i n c l u d i n g t h e e f f e c t s o f b u o y a n c y . 
' H y d r o s t a t i c l o a d s a n d t h e e f f e c t s o f b u o y a n c y c a n u s u a l l y 
b e a d d r e s s e d t h r o u g h t h e r e q u i r e d o p e n i n g s d e s c r i b e d i n 
S u b s e c t i o n ( 3 ) o f t h i s S e c t i o n . 
( 3 ) B e l o w - g r a a e c r a w l s p a c e s ( a n d o t h e r c r a w l s p a c e s d e s i g n s ) 
a r e e n c l o s e d a r e a s b e l o w t h e b a s e f l o o d e l e v a t i o n (BFE) 
a n d , a s s u c h , m u s t h a v e o p e n i n g s t h a t e q u a l i z e 
h y d r o s t a t i c p r e s s u r e s b y a l l o w i n g t h e a u t o m a t i c e n t r y a n d 
e x i t o f f l o o d w a t e r s . T h e b o t t o m o f e a c h f l o o d v e n t 
o p e n i n g s h a l l b e n o m o r e t h a n 1 f o o t a b o v e t h e l o w e s t 
a d j a c e n t e x t e r i o r g r a d e . 
( 4 ) F o r a l l c r a w l s p a c e s , p o r t i o n s o f t h e b u i l d i n g b e l o w b a s e 
f l o o d e l e v a t i o n s h a l l b e c o n s t r u c t e d w i t h m a t e r i a l s 
r e s i s t a n t t o f l o o d d a m a g e . T h i s i n c l u d e s n o t o n l y t h e 
f o u n d a t i o n w a l l s o f t h e c r a w l s p a c e u s e d t o e l e v a t e t h e 
b u i l d i n g , b u t a l s o a n y j o i s t s , i n s u l a t i o n , , o r o t h e r 
m a t e r i a l s t h a t a r e b e l o w t h e b a s e f l o o d e l e v a t i o n . I f 
f l o o d - r e s i s t a n t m a t e r i a l s a r e n o t u s e d f o r b u i l d i n g 
e l e m e n t s , t h o s e e l e m e n t s s h a l l b e e l e v a t e d a b o v e b a s e 
f l o o d e l e v a t i o n . T h e r e c o m m e n d e d c o n s t r u c t i o n p r a c t i c e 
i s t o e l e v a t e t h e b o t t o m o f j o i s t s a n d a l l i n s u l a t i o n a t 
l e a s t o n e f o o t a b o v e b a s e f l o o d e l e v a t i o n . M o s t t y p e s o f 
i n s u l a t i o n a r e n o t f l o o d - r e s i s t a n t m a t e r i a l s . 
F l o o d - r e s i s t a n t m a t e r i a l s s h a l l b e d e t e r m i n e d a n d w h e r e 
u s e d , s h a l l b e i n a c c o r d a n c e w i t h FEMA -Technical Bulletin 
2, Flood Damage-Resistant Materials Requirements, August 
2008, o r a s r e v i s e d . 
( 5 ) A n y b u i l d i n g u t i l i t y s y s t e m s w i t h i n a. c r a w l s p a c e s h a l l b e 
e l e v a t e d a b o v e BFE o r . d e s i g n e d s o t h a t f l o o d w a t e r s c a n n o t 
e n t e r o r a c c u m u l a t e w i t h i n t h e s y s t e m c o m p o n e n t s d u r i n g 
f l o o d c o n d i t i o n s . D u c t w o r k , i n p a r t i c u l a r , m u s t e i t h e r 
b e p l a c e d a b o v e t h e b a s e f l o o d e l e v a t i o n o r s e a l e d f r o m 
f l o o d w a t e r s . 
FEMA B u l l e t i n 3 4 8 , Protecting Building Utilities from 
Flood Damage, p r o v i d e s d e t a i l e d g u i d a n c e o n d e s i g n i n g a n d 
c o n s t r u c t i n g , f l o o d ^ r e s i s t a n t u t i l i t y s y s t e m s . . 
(NOTE:. S e c t i o n - R 3 2 4 . 1 . 5 o f t h e r e s i d e n t i a l " B u i l d i n g C o d e 
a l s o a d d r e s s e s m e c h a n i c a l a n d e l e c t r i c a l s y s t e m s . 
S e c t i o n 7 a n d . T a b l e 7 - 1 o f . ASCE S t a n d a r d 2 4 - 0 5 , Flood . 
Resistant Design and Construction, a l s o " a d d r e s s u t i l i t y 
. r e q u i r e m e n t s a n d m a y i n c l u d e r e q u i r e m e n t f o r e l e v a t i o n 
h i g h e r t h a n b a s e f l o o d e l e v a t i o n f o r c e r t a i n s i t u a t i o n s ) . 
( 6 ) T h e i n t e r i o r g r a d e o f a b e l o w - g r a d e c r a w l s p a c e b e l o w . t h e 
b a s e f l o o d e l e v a t i o n s h a l l n o t b e m o r e t h a n 2 f e e t b e l o w 
. thé. , l o w e s t a d j a c e n t e x t e r i o r g r a d e a s s h o w n i n F i g u r e 1 3 -
3 . 
( 7 ) T h e h e i g h t o f a b e l p w - g r a d e c r a w l s p a c e , . m e a s u r e d f r o m t h e 
i n t e r i o r g r a d e o f t h e c r a w l s p a c e t o t h e t o p o f t h e 
c r a w l s p a c e f o u n d a t i o n w a l l s h a l l n o t e x c e e d 4 f e e t a t a n y 
p o i n t a s s h o w n i n F i g u r e 1 3 - 3 . T h e h e i g h t l i m i t a t i o n i s 
t h e m a x i m u m a l l o w a b l e u n s u p p o r t e d w a l l h e i g h t a c c o r d i n g 
t o t h e e n g i n e e r i n g a n a l y s e s a n d b u i l d i n g c o d e 
r e q u i r e m e n t s f o r f l o o d h a z a r d a r e a s . 
( 8 ) T h e d r a i n a g e s y s t e m s h a l l b e d e s i g n e d t o r e m o v e 
f l o o d w a t e r s f r o m t h e i n t e r i o r a r e a o f t h e c r a w l s p a c e i n a 
m a x i m u m t i m e o f 7 2 h o u r s . T h e t y p e o f d r a i n a g e s y s t e m 
w i l l v a r y b e c a u s e o f t h e s i t e g r a d i e n t a n d o t h e r d r a i n a g e 
c h a r a c t e r i s t i c s , s u c h a s s o i l t y p e s . O p t i o n s i n c l u d e , 
b u t a r e n o t l i m i t e d t o , n a t u r a l d r a i n a g e t h r o u g h p o r o u s , 
w e l l - d r a i n e d s o i l s , d r a i n a g e s y s t e m s s u c h a s p e r f o r a t e d 
p i p e s , d r a i n a g e t i l e s , o r g r a v e l o r c r u s h e d s t o n e 
. .... d r a i n a g e . b y . g r a v i t y . . o.r. m e c h a n i c a l m e a n s . T h e d r a i n a g e 
s y s t e m s h a l l b e a s y s t e m a p p r o v e d b y t h e B u i l d i n g 
O f f i c i a l o r s h a l l b e d e s i g n e d a n d s t a m p e d b y t h e 
a p p l i c a n t ' s e n g i n e e r . 
(NOTE-. B u i l d i n g s t h a t h a v e b e l c i w - g r a d e c r a w l s p a c e s w i l l 
. h a v e h i g h e r f l o o d i n s u r a n c e p r e m i u m s t h a n b u i l d i n g s t h a t 
h a v e t h e p r e f e r r e d c r a w l s p a c e c o n s t r u c t i o n w i t h t h e 
i n t e r i o r e l e v a t i o n a t o r a b o v e t h e l o w e s t a d j a c e n t g r a d e , 
e v e n w h e n t h e ^ c r - a w l s p a c e m e e t s , t h e r e q u i r e m e n t s o f t h i s 
s e c t i o n a n d FEMA T e c h n i c a l B u l l e t i n 1 1 - 0 1 . B u i l d i n g s 
w i t h b e l o w - g r a d e c r a w l s p a c e s c u r r e n t l y c a n n o t b e r a t e d b y 
a n i n s u r a n c e a g e n t u s i n g t h e N F I P F l o o d I n s u r a n c e M a n u a l . 
T h e y m u s t b e s u b m i t t e d f o r a - s p e c i a l r a t i n g u n d e r t h e 
" S u b m i t ^ t o - R a t e " p r o c e s s b y u n d e r w r i t e r s k n o w l e d g e a b l e i n 
t h i s t y p e : o f c o n s t r u c t i o n ) . 
F i g u r e 1 3 - 1 . P r e f e r r e d C r a w l s p a c e C o n s t r u c t i o n 
Floor Joist 
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Floor Joist 
Wall Height-
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X 
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-Foundation Wall 
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* «.« .J^opling Y ' «'•V 
F i g u r e 1 3 - 3 . R e q u i r e m e n t s f o r B e l o w - G r a d e 
C r a w l s p a c e C o n s t r u c t i o n 
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1 3 . 2 7 0 - F l o o d w a y s . 
L o c a t e d w i t h i n a r e a s o f s p e c i a l f l o o d h a z a r d ; a r e a r e a s 
d e s i g n a t e d a s f l ö o d w ä y s . S i n c e t h e f l o o d w a y i s a n 
e x t r e m e l y h a z a r d o u s a r e a d u e t o t h e v e l o c i t y , o f 
f l o o d w a t e r s w h i c h c a r r y d e b r i s , p o t e n t i a l p r o j e c t i l e s , 
a n d e r o s i o n p o t e n t i a l . , t h e p r o v i s i o n s o f t h i s S e c t i o n 
a p p l y . 
1 3 ; 2 7 l D e s i g n a t e d F l o o d w a y s . 
( 1 ) E x c e p t a s . p r o v i d e d i n S e c t i o n ( 3 ) b e l o w , e n c r o a c h m e n t , 
f i l l , n e w c o n s t r u c t i o n , s u b s t a n t i a l i m p r o v e m e n t s o r o t h e r 
d e v e l o p m e n t s h a l l n o t o c c u r w i t h i n a f l o o d w a y d e s i g n a t e d 
b y F l o o d . I n s u r a n c e S t u d y o r F l o o d I n s u r a n c e ' R a t e M a p s 
u n l e s s a t e c n n i c a l e v a l u a t i o n i s p e r f o r m e d a n d c e r t i f i e d 
b y a r e g i s t e r e d p r o f e s s i o n a l c i v i l e n g i n e e r , a n d 
d e m o n s t r a t e s t h r o u g h h y d r o l o g i e a n d h y d r a u l i c a n a l y s i s 
p e r f o r m e d i n a c c o r d a n c e w i t h s t a n d a r d e n g i n e e r i n g 
p r a c t i c e t h a t e n c r o a c h m e n t s , i n c l u d i n g a n y s u r r o u n d i n g 
p r o p e r t y m o d i f i c a t i o n s o r i m p r o v e m e n t s , s h a l l n o t r e s u l t 
i n a n y i n c r e a s e i n f l o o d l e v e l s d u r i n g t h e o c c u r r e n c e o f 
t h e b a s e f l o o d d i s c h a r g e . 
( 2 ) I f s u b s e c t i o n ( 1 ) i s s a t i s f i e d , a l l n e w c o n s t r u c t i o n a n d 
s u b s t a n t i a l i m p r o v e m e n t s s h a l l c o m p l y w i t h a l l a p p l i c a b l e 
f l o o d h a z a r d r e d u c t i o n p r o v i s i o n s o f t h i s c o d e . 
( 3 ) P r o j e c t s f o r s t r e a m h a b i t a t r e s t o r a t i o n may b e p e r m i t t e d 
i n t h e f l o o d w a y p r o v i d e d : 
( a ) T h e p r o j e c t q u a l i f i e s f o r a D e p a r t m e n t o f t h e A r m y , 
. P o r t l a n d D i s t r i c t Regional General Permit for Stream 
Habitat Restoration ( N W P - 2 0 0 7 - 1 0 2 3 ) ; a n d 
( b ) A q u a l i f i e d p r o f e s s i o n a l ( a R e g i s t e r e d P r o f e s s i o n a l 
E n g i n e e r ; o r s t a f f o f NRCS; t h e c o u n t y , o r 
f i s h e r i e s , n a t u r a l r e s o u r c e s , o r w a t e r r e s o u r c e s 
a g e n c i e s ) h a s p r o v i d e d à f e a s i b i l i t y a n a l y s i s a n d 
c e r t i f i c a t i o n t h a t t h e p r o j e c t " w a s d e s i g n e d t o k e e p 
a n y r i s e i n 1 0 0 - y e a r f l o o d l e v e l a s c l o s e t o z e r o a s 
p r a c t i c a l l y p o s s i b l e g i v e n t h e g o a l s o f t h e p r o j e c t ; 
a n d 
( c ) No s t r u c t u r e s w o u l d b e i m p a c t e d b y a p o t e n t i a l r i s e 
i n f l o o d e l e v a t i o n ; a n d 
( d ) An a g r e e m e n t t o m o n i t o r t h e p r o j e c t , c o r r e c t 
p r o b l e m s , a n d ; e n s u r e t h a t f l o o d c a r r y i n g c a p a c i t y 
- - r e m a i n s u n c h a n g e d i s i n c l u d e d a s p a r t o f t h e l o c a l 
a p p r o v a l . 
( 4 ) New i n s t a l l a t i o n o f m a n u f a c t u r e d d w e l l i n g s i s p r o h i b i t e d , 
e x c e p t a s p r o v i d e d i n t h i s S e c t i o n ( a s r e g u l a t e d b y t h e 
2 0 0 2 O r e g o n M a n u f a c t u r e d D w e l l i n g a n d P a r k S p e c i a l t y 
C o d e ) . M a n u f a c t u r e d d w e l l i n g s m a y o n l y b e l o c a t e d i n 
f l o o d w a y s a c c o r d i n g t o o n e o f t h e f o l l o w i n g c o n d i t i o n s : 
( a ) I f t h e m a n u f a c t u r e d d w e l l i n g a l r e a d y e x i s t s i n t h e 
f l o o d w a y , t h e p l a c e m e n t " w a s p e r m i t t e d a t t h e . t i m e o f 
t h e o r i g i n a l i n s t a l l a t i o n , a n d t h e c o n t i n u e d u s e i s 
n o t a t h r e a t t o l i f e , h e a l t h , p r o p e r t y , o r t h é 
g e n e r a l w e l f a r e o f t h e p u b l i c ; o r 
Î b ) A n e w m a n u f a c t u r e d d w e l l i n g i s r e p l a c i n g a n . e x i s t i n g 
m a n u f a c t u r e d d w e l l i n g w h o s e o r i g i n a l p l a c e m e n t w a s 
p e r m i t t e d a t t h e t i m e o f i n s t a l l a t i o n a n d t h e 
r e p l a c e m e n t h o m e w i l l n o t b e a t h r e a t t o l i f e , 
h e a l t h , p r o p e r t y , o r t h e g e n e r a l w e l f a r e o f t h e 
p u b l i c , a n d i t m e e t s t h e f o l l o w i n g c r i t e r i a : 
( i ) A s r e q u i r e d b y 4 4 CFR C h a p t e r 1 , S u b p a r t 
6 0 . 3 ( d ) ( 3 ) , i t m u s t b e d e m o n s t r a t e d t h r o u g h 
h y d r o l o g i c a n d h y d r a u l i c a n a l y s e s p e r f o r m e d i n 
a c c o r d a n c e w i t h s t a n d a r d e n g i n e e r i n g p r a c t i c e s 
t h a t t h e m a n u f a c t u r e d d w e l l i n g a n d a n y 
a c c e s s o r y b u i l d i n g s , a c c e s s o r y s t r u c t u r e s , o r 
a n y p r o p e r t y i m p r o v e m e n t s ( e n c r o a c h m e n t s ) w i l l 
n o t r e s u l t i n a n y i n c r e a s e i n f l o o d l e v e l s 
d u r i n g t h e o c c u r r e n c e o f t h e b a s e f l o o d 
e l e v a t i o n ; 
( i i ) T h e r e p l a c e m e n t m a n u f a c t u r e d d w e l l i n g a n d a n y 
a c c e s s o r y b u i l d i n g s o r a c c e s s o r y s t r u c t u r e s 
( e n c r o a c h m e n t s ) s h a l l h a v e t h e f i n i s h e d f l o o r 
e l e v a t e d a. m i n i m u m o f 1 8 i n c h e s ( 4 6 cm) a b o v e 
t h e b a s e f l o o d e l e v a t i o n a s i d e n t i f i e d o n t h e 
F l o o d I n s u r a n c e R a t e Map; 
( i i i ) T h e r e p l a c e m e n t m a n u f a c t u r e d d w e l l i n g i s p l a c e d 
a n d s e c u r e d t o a f o u n d a t i o n s u p p o r t s y s t e m 
d e s i g n e d b y a n O r e g o n p r o f e s s i o n a l e n g i n e e r o r 
a r c h i t e c t a n d a p p r o v e d b y t h e C o m m u n i t y 
D e v e l o p m e n t D e p a r t m e n t ; 
( i v ) T h e r e p l a c e m e n t m a n u f a c t u r e d d w e l l i n g , i t s 
f o u n d a t i o n s u p p o r t s , a n d a n y a c c e s s o r y 
b u i l d i n g s , a c c e s s o r y s t r u c t u r e s , o r p r o p e r t y 
i m p r o v e m e n t s ( e n c r o a c h m e n t s ) d o n o t d i s p l a c e 
w a t e r t o t h e d e g r e e t h a t i t c a u s e s a r i s e i n 
. . t h e w a t e r l e v e l o r d i v e r t s w a t e r i n a m a n n e r 
t h a t c a u s e s e r o s i o n o r d a m a g e , t o o t h e r 
p r o p e r t i e s ; 
( v ) T h e l o c a t i o n , u s e , , a n d i m p r o v e m e n t s o f a 
r e p l a c e m e n t m a n u f a c t u r e d d w e l l i n g c o m p l i e s w i t h 
a l l p r o v i s i o n s o f t h i s C o d e , o t h e r a p p l i c a b l e 
' C o d e s , a n d a n y c o n d i t i o n s o f a p p r o v a l ; a n d 
1 3 . 2 7 2 F l o o d w a y s N o t D e s i g n a t e d . 
( 1 ) I n a r e a s w h e r e a r e g u l a t o r y f l o o d w a y h a s n o t b e e n 
d e s i g n a t e d i n t h e F l o o d I n s u r a n c e S t u d y o r o n t h e F l o o d . 
I n s u r a n c e R a t e M a p s , n o n e w c o n s t r u c t i o n , s u b s t a n t i a l 
i m p r o v e m e n t s , o r o t h e r d e v e l o p m e n t ( i n c l u d i n g f i l l ) s h a l l 
b e p e r m i t t e d w i t h i n Z o n e s A l - 3 0 a n d AE o n t h e F l o o d 
i n s u r a n c e R a t e . M a p , u n l e s s i t i s d e m o n s t r a t e d t h a t t h e 
c u m u l a t i v e e f f e c t o f t h e p r o p o s e d d e v e l o p m e n t , w h e n 
- c o m b i n e d w i t h a l l o t h e r e x i s t i n g a n d a n t i c i p a t e d 
d e v e l o p m e n t , w i l l n o t i n c r e a s e t h e w a t e r s u r f a c e 
e l e v a t i o n o f t h e b a s e f l o o d m o r e t h a n o n e f o o t a t a n y 
p o i n t w i t h i n t h e c o m m u n i t y . 
( 2 ) D e v e l o p m e n t s h a l l n o t o c c u r o n a n y f l o o d p l a i n l a n d s , 
w h e r e a f l o o d w a y h a s n o t b e e n d e s i g n a t e d f o r t h a t r e a c h 
o f . a s t r e a m o r r i v e r i n t h e F l o o d I n s u r a n c e S t u d y 
r e f e r e n c e d i n S e c t i o n 1 3 . 2 3 2 o f t h i s C o d e u n l e s s : 
( a ) T h e D i r e c t o r h a s e v i d e n c e w h i c h i n h i s j u d g m e n t 
w o u l d i n d i c a t e t h e p r o p o s e d d e v e l o p m e n t s i t e i s 
l o c a t e d i n a n a r e a o f s h a l l o w f l o o d i n g , a n d t h e 
p r o p o s e d d e v e l o p m e n t c o m p l i e s w i t h t h e p r o v i s i o n s o f 
S e c t i o n 1 3 . 2 8 0 a n d w i l l n o t d i v e r t t h e f l o o d o r 
c a u s e a r i s e i n t h e l e v e l o f t h e d i s c h a r g e a b o v e t h e 
b a s e f l o o d e l e v a t i o n ; o r 
( b ) A t e c h n i c a l s t u d y i s c o m p l e t e d w h i c h e s t a b l i s h e s t h e 
p r o b a b l e l o c a t i o n o f t h e f l o o d w a y a s d e f i n e d i n t h i s 
C o d e , a n d t h e p r o p o s e d d e v e l o p m e n t c o m p l i e s w i t h t h e 
a p p l i c a b l e p r o v i s i o n s o f t h i s C o d e , w h e t h e r i t i s 
w i t h i n t h e f l o o d w a y o r t h e f l o o d w a y f r i n g e . 
( 3 ) I f a t e c h n i c a l s t u d y i s c o m p l e t e d u n d e r t h e r e q u i r e m e n t s 
o f t h i s s e c t i o n , d e m o n s t r a t i n g t h a t t h e e n c r o a c h m e n t w i l l 
n o t i n c r e a s e t h e . f l o o d l e v e l s , a n y p e r m i t t e d c o n s t r u c t i o n 
o r s u b s t a n t i a l i m p r o v e m è n t s s h a l l c o m p l y w i t h a l l o t h e r 
a p p l i c a b l e s t a n d a r d s o f t h i s C o d e . 
1 3 . 2 8 0 S t a n d a r d s f o r S h a l l o w F l o o d i n g A r e a s (AO Z o n e s ) . 
S h a l l o w f l o o d i n g a r e a s a p p e a r o n F l o o d I n s u r a n c e R a t e 
M a p s a s AO z o n e s w i t h " d e p t h d e s i g n a t i o n s . T h e b a s e f l o o d 
d e p t h s i n t h e s e o n e s r a n g e f r o m 1 t o 3 f e e t a b o v e g r o u n d 
w h e r e a c l e a r l y d e f i n e d c h a n n e l d o e s n o t e x i s t , o r w h e r e 
t h e p a t h o f f l o o d i n g i s u n p r e d i c t a b l e a n d w h e r e v e l o c i t y 
f l o w m a y b e e v i d e n t . S u c h f l o o d i n g i s u s u a l l y 
c h a r a c t e r i z e d a s s h e e t f l o w . I n ' t h e s e a r e a s , t h e 
f o l l o w i n g p r o v i s i o n s a p p l y : . -
( 1 ) R e s i d e n t i a l S t r u c t u r e s . New c o n s t r u c t i o n a n d s u b s t a n t i a l 
i m p r o v e m e n t s o f r e s i d e n t i a l s t r u c t u r e s a n d m a n u f a c t u r e d 
h o m e s w i t h i n AO z o n e s s h a l l h a v e t h e l o w e s t f l o o r , 
( i n c l u d i n g b a s e m e n t ) e l e v a t e d a b o v e t h e h i g h e s t g r a d e 
a d j a c e n t t o t h e b u i l d i n g , a m i n i m u m o f o n e f o o t a b o v e t h e 
d e p t h n u m b e r s p e c i f i e d o n t h e F l o o d I n s u r a n c e ; R a t e Map , 
o r a t l e a s t t w o f e e t a b o v e t h e h i g h e s t g r a d e a d j a c e n t . t o 
t h e b u i l d i n g i f n o d e p t h n u m b e r i s s p e c i f i e d . 
( 2 ) N o n r e s i d e n t i a l S t r u c t u r e s . New c o n s t r u c t i o n anc} 
s u b s t a n t i a l i m p r o v e m e n t s o f n o n r e s i d e n t i a l s t r u c t u r e s 
w i t h i n AO z o n e s s h a l l e i t h e r : 
( a ) H a v e t h e l o w e s t f l o o r { i n c l u d i n g b a s e m e n t ) e l e v a t e d 
a b o v e t h e h i g h e s t a d j a c e n t g r a d e o f t h e b u i l d i n g 
s i t e , a m i n i m u m o f o n e f o o t a b o v e t h e d e p t h n u m b e r 
s p e c i f i e d o n t h e F l o o d I n s u r a n c e R a t e Map, o r a t 
l e a s t t w o f e e t a b o v e t h e h i g h e s t g r a d e a d j a c e n t t o 
t h e b u i l d i n g i f n o d e p t h n u m b e r i s s p e c i f i e d ; o r 
( b ) T o g e t h e r w i t h a t t e n d a n t u t i l i t y a n d s a n i t a r y 
f a c i l i t i e s - , b e . c o m p l e t e l y f l o o d p r o o f e d t o a m i n i m u m 
o f o n e - f o o t a b o v e t h e d e p t h n u m b e r s p e c i f i e d o n t h e 
F l o o d I n s u r a n c e R a t e M a p , . o r a t l e a s t t w o f e e t a b o v e 
t h e h i g h e s t g r a d e a d j a c e n t t o t h e b u i l d i n g i f n o 
d e p t h n u m b e r i s s p e c i f i e d , s o t h a t a n y s p a c e b e l o w 
t h a t l e v e l i s w a t e r t i g h t w i t h w a l l s s u b s t a n t i a l l y 
i m p e r m e a b l e t o t h e p a s s a g e o f w a t e r a n d w i t h 
s t r u c t u r a l c o m p o n e n t s h a v i n g t h e c a p a b i l i t y o f 
r e s i s t i n g h y d r o s t a t i c a n d h y d r o d y n a m i c l o a d s a n d 
e f f e c t s o f b u o y a n c y . I f t h i s m e t h o d i s u s e d , 
. c o m p l i a n c e s h a l l b e c e r t i f i e d b y a r e g i s t e r e d 
p r o f e s s i o n a l e n g i n e e r o r a r c h i t e c t a s i n S e c t i o n 
... 1 3 . 2 6 2 . 
1 3 . 2 9 0 C r i t i c a l F a c i l i t i e s a n d E s s e n t i a l F a c i l i t i e s 
1 3 . 2 9 1 C r i t i c a l F a c i l i t i e s . 
( 1 ) I t i s r e c o m m e n d e d t h a t c o n s t r u c t i o n o f n e w c r i t i c a l 
f a c i l i t i e s i s , t o t h e e x t e n t p o s s i b l e , l o c a t e d o u t s i d e 
t h e l i m i t s o f t h e S p e c i a l F l o o d . H a z a r d A r e a (SFHA) a l s o 
k n o w n a s t h e 1 0 0 - y e a r f l o o d p l a i n . 
( 2 ) I t i s r e c o m m e n d e d t h a t c o n s t r u c t i o n o f rtew c r i t i c a l 
f a c i l i t i e s o c c u r w i t h i n t h e SFHA o n l y i f n o f e a s i b l e 
a l t e r n a t i v e s i t e i s a v a i l a b l e . 
. ( 3 ) T h e f o l l o w i n g a r e r e c o m m e n d e d when. C r i t i c a l F a c i l i t i e s 
a r e c o n s t r u c t e d w i t h i n t h e SFHA'.. R e c o m m e n d a t i o n s i n t h i s 
S e c t i o n d o n o t a f f e c t o t h e r m a n d a t o r y p r o v i s i o n s o f t h i s 
C o d e o r o t h e r a p p l i c a b l e c o d e s . 
( a ) I t i s r e c o m m e n d e d t h a t C r i t i c a l , F a c i l i t i e s 
c o n s t r u c t e d w i t h i n : t h e SFHA h a v e , t h e . l o w e s t f l o o r 
: e l e v a t e d a m i n i m u m o f t h r e e f e e t o r t o t h e h e i g h t o f 
. . t h e o f t h e 5 0 0 - y e a r . f l o o d , w h i c h e v e r i s h i g h e r . 
( b ) I t i s r e c o m m e n d e d t h a t a c c e s s t o a n d f r o m t h e 
c r i t i c a l f a c i l i t y s h o u l d a l s o b e p r o t e c t e d t o t h e 
h e i g h t u t i l i z e d a b o v e . When, t h o s e h e i g h t s a r e n o t 
f e a s i b l e , i t i s a t l e a s t r e c o m m e n d e d t h a t a c c e s s 
r o u t e s . b e e l e v a t e d t o o r , a b o v e t h e l e v e l - o f t h e b a s e 
f l o o d e l e v a t i o n t o a l l c r i t i c a l f a c i l i t i e s t o t h e 
e x t e n t p o s s i b l e . 
( 4 ) F l o o d p r o o f i n g a n d s e a l i n g m e a s u r e s s h o u l d b e t a k e n t o 
e n s u r e t h a t t o x i c s u b s t a n c e s w i l l n o t b e d i s p l a c e d b y o r 
r e l e a s e d i n t o f l o o d w a t e r s . 
1 3 . 2 9 2 E s s e n t i a l F a c l l i t i e s . 
( 1 ) S i t i n g a n d c o n s t r u c t i o n o f E s s e n t i a l F a c i l i t i e s , a s 
d e f i n e d i n t h e S t a t e B u i l d i n g C o d e , s h a l l c o m p l y w i t h t h e 
a p p l i c a b l e p r o v i s i o n s o f t h e S t a t e B u i l d i n g C o d e , a n d 
o t h e r d o c u m e n t s a d o p t e d b y r e f e r e n c e i n t h e S t a t e 
B u i l d i n g C o d e , s u c h a s t h e ASCE S t a n d a r d s . 
SAFEGUARDS FROM HAZARD AREAS 
Geologic Hazard Areas 
Since there is no recent record of any geologic activity in the region, it is reasonable to assume that 
development may proceed without implementing safeguards such as earthquake design or avoidance 
of location on fault lines. 
Slope Hazard Areas 
The most effective method for the city and county to minimize the hazards of development on steep 
slopes is to review the development process. Slopes in the excess of 35% should be considered 
hazardous areas. Development that is proposed on slopes greater than 35% should be required to 
have development plans approved by a licensed engineering geologist in order to ensure that soil 
erosion and earth movement hazards will be minimized. A review of hillside developments on 
slopes 15% to 35% should be made by an engineer and a soil scientist in order to minimize the 
hazards to the structure and to reduce the potential for erosion. Supplemental engineering and site 
design may be required to lessen the degree of risk. 
Soil Hazard Areas 
In the preceding subsection, the various soils within the UGB area are inventoried according to a set 
to characteristics that relate the properties of each soil to specific hazards. 
Safeguards for each hazard are primarily related to regulations that protect the stability of the soil and 
the major hazard for most soils. Once significant soil erosion begins in an area, drastic and costly 
"stop-gap" measures must be implemented to arrest the rate of erosion. Preventive measures for soil 
stability on erodible soils is often the best approach. Such preventive measures are: 
• traps to keep top soil on the site 
> leaving natural vegetation in place 
• reducing surface water run-off with vegetative planting and keeping natural water 
retention areas. 
Shrink-swell and road building hazards can be safe-guarded with adequate design and site 
preparation. An important task is to ensure that builders and developers are made aware of the soil 
properties of the site or area before planning, and construction begin. The soil mapping and inventory 
of this section should serve as adequate generalized information regarding the hazards of soils within 
tile UGB area. Site specific analysis of the soils should be encouraged in sensitive areas where soils 
are exposed to weathering and/or where slopes are steeper than 35% percent. 
The relationship between steep topography, soils and natural vegetation becomes increasingly 
delicate as the percentage of slope increases. This delicate balance is strongly affected by human 
actions in developing or preparing sites for development. Extensive excavations for cut and fills, 
premature removal of natural vegetation and the additional load placed on a hillside by development 
can lead to earth movement in the form of slope erosion or mass movement. 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 12 
EXHIBIT^ 
5.30 FLOOD HAZARD 
PURPOSE 
The purpose of this section is to describe the history of flooding in the urban growth boundary area, 
identify the flood-prone areas, evaluate the degree of hazard, and describe the appropriate safeguards 
from flooding. 
HISTORY OF FLOODING 
The earliest recorded flood in Josephine County occurred in 1861. Since no subsequent flood has 
surpassed the magnitude of that flood, it has been chosen to represent the "100 year flood." (Army 
Corps of Engineers) Flood magnitudes are rated by their chance of annual occurrence. A "100 year 
flood" is assumed to have a 1% chance of occurring each year. A" 1 year flood" is assumed to have a 
100% chance of occurring each year. These are mathematical relationships that ignore the natural 
variables which affect the weather. Table 5.30.1 depicts the major floods of the Rogue River at 
Grants Pass during the last 120 years. 
TABLE 5.3.1 
Major Floods of the Rogue River at Grants Pass 
Nov. - Dec., 1861 175,000 cfs ("100 year") 
Feb., 1890 160,000 cfs 
Feb., 1907 60,500 cfs 
Nov., 1909 . 70,000 cfs 
Feb., 1927 138,000 cfs 
Dec., 1942 54,400 cfs 
Dec., 1945 70,000 cfs 
Jan., 1948 59,900 cfs 
Oct., 1950 65,400 cfs 
Jan., 1953 77,000 cfs 
Dec., 1955 135,000 cfs 
Dec,, 1964 152,000 cfs ("50 year") 
Dec., 1972. 82,500 cfs 
Dec., 1974 96,400 cfs 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 13 
The table reveals that there is little mathematical order to the occurrence of floods. Floods of 
similar magnitude can occur within a few years of each other, such as the Februaiy 1907 and 
November 1909 floods and the October 1950 and January 1953 floods. Floods of relatively great 
magnitude can occur within a decade of each other, such as the December 1955 and December 1964 
floods. The long range forecasting of flood occurrences would seem able to predict only that floods 
will occur at random intervals and at varying magnitudes. 
FLOODPRONE AREAS 
The Rogue River flows through the approximate center of the Urban Growth Boundary area. There 
are five confluent creeks that discharge into the Rogue River within the UGB. Map 5.30.3 shows the 
UGB and the floodprone areas (shaded). The actual areas of special flood hazard are identified 
by the Federal Emergency Management Agency in a scientific and engineering report titled 
"Flood Insurance Study" with the accompanying Flood Insurance Rate Maps for Josephine 
County and Incorporated areas effective date December 3,2009, and any revision. These areas 
were subject to flooding during the 1964 flood. Note that flood levels protruded into the channels of 
Gilbert and Allen Creeks. This phenomenon occurs because the flood level of the river is at a high 
elevation and the flood waters of the creeks are effectively "dammed" by river water. Water always 
seeks mean sea level and, therefore, is always flowing to the ocean. When the creeks are dammed by 
the river, then they overflow their banks upstream and water flows in sheets over the surface of the 
land in its relentless search for sea level. Therefore, the confluent creeks of the UGB area are also 
prone to a flood hazard relative to the magnitude of the river flooding. 
DEGREE OF FLOOD HAZARD 
The degree of flood hazard is measured in terms of loss of life and property. No deaths from 
flooding in the Grants Pass area are noted in the literature. Flood warnings usually occur in time to 
prevent loss of life^ as people are able to move out of the floodprone areas. However, real property 
and improvements such as buildings are subject to the forces of flooding water. A quote from the 
Postflood Report. December 1964 Flood (Army Corps of Engineers) can dramatically relate the 
damages to property by flooding. 
"One of the major factors causing excessive damages during this flood was the enormous quantity of 
debris brought into the channel from every source. This debris collected behind bridges resulting in 
the complete destruction of several, and major damage to nearly ever other bridge across the main 
stream. It also contributed to residential damage all along the river, knocking buildings from their 
foundations or smashing into walls." 
Within the UGB area, residential areas on both sides of the river were flooded up to 8 feet. 
(Postflood Report, 1964. Army Corps of Engineers). The city sewage treatment plant sustained 
damages estimated at about $65,000. The Postflood Report did not summarize the value of 
residential damage but did state the values of the home flooded to be between $30,000 and $50,000 
per home and estimated the average residential damage to be $900 per residence. Exhibit 5.30.2 
shows an aerial view of the flooding of 1964. 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 14 
EXHIBIT 5.30.2 
Aerial View of 1964 Flood 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 15 
SAFEGUARDS FROM FLOODING 
Safeguards from flooding that can be implemented at the local level are warning systems, land use 
regulations and the Federal Flood Insurance Program. 
Warning Systems 
The Army Corps of Engineers operates a computer simulation model for the hydrological 
characteristics of all the significant water drainage basins in Oregon. That simulation model can 
predict fairly accurately when a flooding river system will "crest", or reach its highest flooding 
elevation, and what the elevation will be at the "crest." That information is provided to all radio 
stations and local emergency units like the police and national guard. If elevations of floodprone 
areas are known by recognized landmarks, then people and mobile property can be removed from the 
anticipated flooding area. An emergency evacuation program that employs local police, fire 
department and other civic groups can help facilitate the relocation of persons and property from a 
floodprone area. 
Land Use Regulations 
The City and/or County can regulate the use of land within known floodprone areas. The regulations 
can range from allowing no development in floodprone areas to allowing any type of development in 
conjunction with federal floodplain laws. The regulations can also selectively designate floodprone 
areas as public open space for parks, wildlife areas and floodways. Public open spaces would allow 
active public use of the land and enhance the attractiveness and livability of the Urban Growth 
Boundary Area, while reducing future potential losses of life and property from flooding. 
Land use regulations can also be used to set aside land areas for the detention of storm water. Those 
lands, such as wetlands, grassed waterways, and woodlands, may reduce flood elevations of the 
frequent small floods, and prevent future increases in flood heights of these frequent floods. 
Flood heights have the potential for increase in proportion to the increases in urban level 
development in the Boundary area. Urban development increases the amount of storm water runoff 
by increasing the area of impervious surfaces such as streets, driveways, parking lots, and rooftops. If 
the natural storm water detention areas of the UGB area are converted to impervious surfaces by 
urban development, then the storm water runoff will flow more rapidly over the surface, into 
stormdrains and on to the creeks and the river, thereby increasing the elevation of the flood and/or 
decreasing the elapsed time between the beginning of the flood and the flood "crest". 
Land use regulations can provide equitable transfers of land use intensities for each land use type 
from the floodprone areas and storm water detention areas to other less sensitive areas. 
For example, a proposed residential development in an area with potential for storm water detention 
may be encouraged to preserve the detention area through incentives encouraging the transfer of 
density. The potential number of dwelling units that can be built on the detention area may be 
transferred to the remaining buildable area of the land that has less potential for detention. In this 
way, the developer retains the revenue potential of the development, and may even reduce the costs 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 16 
of development by clustering. The community retains an open space and a storm water detention 
area, reducing the hazard of flood, and reducing the size and cost of storm drain lines. 
Federal Flood Insurance Program 
The catastrophic nature of flooding and the relatively localized effect of intermittent floods caused 
the insurance industry to find it financially unfeasible to provide flood insurance at reasonable rates. 
Increasingly, the federal government was requested to act to protect and safeguard private property. 
Legislation was passed in 1956, but money was never appropriated to implement the program. 
Further studies resulted in Title XIII, National Flood Insurance, part of the Housing and Urban 
Development Act of 1968 (Public Law 90-448) and the Flood Disaster Protection Act of 1973. 
Together these acts created an enormous federal subsidy in an effort to provide reasonable flood 
insurance at affordable rates. In effect, the federal government underwrites private insurance 
companies and subsidizes insurance premiums by paying the difference between the "affordable" 
premium which is charged to the policyholder, and the actuarial or "true cost" premium. The 
actuarial premium would be the rate charged to the policy holder if the insurance policy were written 
based on the statistical likelihood of flooding combined with the potential losses resulting from flood 
damage. In exchange for the reduced rate, property owners, through state and local governments, 
agree to adopt appropriate land use control measures to bring the risk of public and private losses to 
acceptable levels. 
In 1979, work was completed on the Flood Insurance Study for the City of Grants Pass. A similar 
study was completed for Josephine County in 1980. Initial use of this information will be to convert 
Grants Pass and Josephine County to the regular flood insurance program of the Federal Insurance 
Administration. Streams in the area requiring detailed study were identified at informal meetings 
held in January 1978, between the U.S. Geological survey, the Federal Insurance Administration and 
the City of Grants Pass. The Rogue River and Gilbert Creek were studied by detailed methods. 
Although the Gilbert Creek flood plain is quite small, the density and intensity of streamside 
development justified establishing the flood zones by detailed methods. Most recently, the Federal 
Emergency Management Agency completed a new Flood Insurance Study for Josephine 
County and Incorporated Areas dated December 3,2009. 
A primary purpose of the National Flood Insurance Program is to encourage state and local 
governments to adopt and enforce land use practices within flood prone areas to the degree necessary 
to reduce the risk to acceptable levels as set forth in the program. Each Flood Insurance Study 
therefore includes a map which delineates the extent and location of areas subject to periodic 
inundation and differentiates between the floodway and 1 00-year and the 500-year flood boundaries. 
In order to provide a national standard without regional discrepancies, the 100-year flood has been 
adopted by the Federal Insurance Administration as the base flood for flood management and 
insurance purposes. The 500-year flood is indicated simply to make communities aware of 
additional areas in the community with perceivable levels of flood risk. Map 5.30.3 illustrates the 
approximate location of the floodway, the 100-year and 500-year flood boundaries. The actual 
areas of special flood hazard are identified by the Federal Emergency Management Agency in 
a scientific and engineering report titled "Flood Insurance Study" with the accompanying 
Flood Insurance Rate Maps for Josephine County and Incorporated areas effective date 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 17 
December 3, 2009, and any revision. 
The principal result of the Flood Insurance Study is the Flood Insurance Rate Map. This map 
contains the official delineation of flood elevation lines. The level of flood risk and therefore 
insurance premiums are determined from this map. 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 18 
MAP 5.30.3 
Floodway and 100-Year Flood Plain for 
Grants Pass Urban Growth Boundary 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 19 
The National Flood Insurance Program divides the area of the 100-year flood into a floodway and 
floodway fringe. The floodway is the actual channel of a stream or river plus any adjacent flood 
plain areas that must be free of encroachment to allow the 100-year flood to flow freely without 
substantial increases in flood heights. Maximum federal standards establish a limit for flood height 
increases of one foot, provided that hazardous velocities are not produced. The area between the 
floodway and the boundary of the 100-year flood are termed the floodway fringe. Exhibit 5.30.4 
depicts the relationship among the stream channel, floodway, floodway fringe and 100-year 
floodplain. 
EXHIBIT 5.30.4 
Floodway-Flood Plain Schematic 
Floodway fdnge 
Flo 
Encroachment-
100-year flood plaitt 
v- Stream channel s 
>d .e l eva i i o ß w 11 irt 
M 
Miigfe: 
B|rçroacl inerït 
- a ;. 
y* o 
A-reä òfiflòod p l & . ^ ^ ¿ ^ S j ' j o n before-
for d o v e i ^ p m m ^ m w H \ ^ o^.flood; plain 
Line C D is {hc^h.oodilovàLÎion àiierïMcroàçii.înOîif " 
Jïpno 
Insurance rates are based on the degree of flood risk. In order to establish actuarial insurance rates, 
the Federal Insurance Administration has developed a process to transform the data depicted in the 
floodway schematic drawing, into flood insurance criteria. That process includes the determination 
of flood hazard factors and flood insurance zone designations for each flooding river or creek. 
The city has adopted a floodplain development ordinance that is in compliance with the National 
Flood Insurance Program. The city ordinance identifies buildable land within the 100-year 
floodplain as the floodway fringe. The floodway is not considered buildable.. Development on the 
buildable land (floodway fringe) must be constructed so that the first floor level of the building is a 
minimum of one foot above the 100-year flood elevation. This regulation anticipates that once the 
floodway fringe is fully encroached upon by development, the actual flood elevation will be raised 
one foot above the 100-year flood level. Development in the floodway must demonstrate that 
encroachment will not raise the flood elevation beyond the one foot maximum above the 100-year 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 20 
flood elevation. The federal regulations require that a qualified surveyor determine the degree of 
displacement. The displacement of floodway water by the proposed floodway development may 
adversely affect other development on the adjacent floodway fringe, which usually precludes 
floodway development in an urban area. 
Grants Pass & Urbanizing Area Comprehensive Plan Last Revision: 11/4/2009 Page 5 - 21 
Federal Emergency Management Agency 
Washington, D.C. 20472 
RECEIVED 
JUNO 9 2009 
CERTIFIED MAIL IN REPLY REFER TO: 
RETURN RECEIPT REQUESTED 19P-N CITY OF GRANTS PASS 
June 3, 2009 
The Honorable Len Holzinger 
Mayor, City of Grants Pass 
101 NW A Streeel 
Grants Pass, Oregon 97526 
Dear Mayor Holzinger: 
Community: City cf Grants Pass, Oregon 
Community No.; 410108 
Map Panels Affected: See FIRM Index 
This is to formally notify you of the final flood hazard determination for your community in compliance 
with Title 44, Chapter I, Part 67, Code of FederalRegulations, On September 27, 1991, the Department of 
Homeland Security's Federal Emergency Management Agency (FEMA) issued a Flood Insurance Rate 
Map (FIRM) that identified the Special Flood Hazard Areas (SFHAs).the areas subject to inundation by 
the tiase (1 -percent-annual-chance) flood in the City of Grants Pass, Josephine County, Oregon. Recently, 
FEMA completed a re-evaluation of flood hazards in your community. On January 23t 2009, FEMA 
provided you with t*r6liminmy copies of the Flood Insurance Study (FIS) report and FJRM thai identify 
existing flood; hazards In your community. 
FEMA has addressed all comments received on the Preliminary copies of the FIS report and FIRM. 
Accordingly, the FIS report ¡and FIRM for your community will become effective on December 3,2009. 
Before the effective date, FEMA will send you final printed copies of the FIS report and FIRM. 
Becausc the FIS for your community has been completed, certain additional requirements must be met 
date of this letter. Prior to December 3,2009, your community is required, as a condition of continued 
eligibility in the National Flood Insurance Program (NFIP), to adopt or show evidence of adoption of 
standards are the minimum requirements and d o ^ S s u f ^ S ^ S y S S ! o r local 
requirements of a more stringent nature. 
It must.be emphasized that all the standards specified in Paragraph 60.3(d) of the NFIP regu lations must be 
enacted inaiegallyenfbrcea b le document. Th is incl Udes adoption o fthe current effective FIS report and 
FERM to which the regulations apply and the other modifications made by this map revision. Some of the 
standards should already have been enacted by your community in order to establish eligibility in the 
NFIP. Any additional requirements-can be met by taking one of the following.actions: 
Amending existing regulations to incorporate any additional requirements o 
EXHIBIT 
2 
Communities thai fail to enact the necessary floodplain management regulations will be suspended from 
participation in the NFIP and subject to tlie prohibitions contained in Section 202(a) of the Flood Disaster 
Protection A c t o f l 9 7 3 as amended. 
In addition to your community using the FiS report and FIRM to manage development In the floodplain, 
FEMA will use the FIS report to establish appropriate flood insurance rates. On the effective date of the 
revised FIRM, actuarial rates for flood insurance will be charged for all new structures and substantial 
improvements to existing structurés located in the identified SFIIAs, These rates may be higher if 
structures are not built in compliance with the floodplain management standards of the NFIP. The 
actuarial flood insurance rates increase as the lowest elevations (including basement) of new structures 
decrease in relation to the Base Flood Elevations established for your community. This is an important 
consideration for new construction because building at a higher elevation can greatly reduce the cost of 
flood insurance. 
To assist your community in maintaining the FIRM, we have enclosed a Summary of Map A étions to 
document previous Letter of Map Change (LOMC) actions (i.e., Letters of Map Amendment, Letters of 
Map Revision) that will be superseded when the revised FIRM panels referenced above become effeetive. 
Information on LOMCs is presented in the following four categories: (1 ) LOMCs for which results have 
been înc/udçd on the revised FIRM panels- (2) LOMCs for which results could not be shown on the revised 
FIRM panels because of scale limitations or because the LOMC issued had determined that the lots or 
structures involved were outside the SFHA as shown on the.FIRM; (3) LOMCs for which results have not 
been included on the revised FIRM panels because the flood hazard information on which the original ' 
déterminations were based is being superseded by new flood hazard information; and (4) LOMCs issued for 
multiple lots or structures where the determination for one or more of the lots or structures cannot be 
revalidated through an administrative process like the LOMCs in Category 2 above. LOMCs in Category 2 
will be revalidated through a single letter that reaffirms the validity'of a previously, issued'LOMC; the letter 
will be sent to your community shortly before the effective date of the revised FIRM and wili become 
effective 1 day after the revised FIRM becomes effective. For the.LOMCs listed in Category A, we will 
review the data previously submitted for the LOMA or LOMR request and issue a new determination for 
the affected properties after the revised FIRM beeomes effective. 
The FIRM and FIS report for your community have been prepared in our countywidc format, which means 
that flood hazard information for all jurisdictions within Josephine County has been combined into otie 
FIRM and FIS report. When the FIRM and FIS report are printed and distributed, your community will 
receive only those panels that present flood hazard information for your community. We will provide 
complete sets of the FIRM panels to county officials, where they will be available for review by your 
community 
The FIRM panels have been computer-generated. Once the FIRM and FIS report are printed and 
distributed, the digital files containing the flood hazard data for the entire county can he provided to your 
community for use in a computer mapping system. These files can be used in conjunction with other 
thematic data for floodplain management purposes, insurance purchase and rating requirements, and many 
" other planning appfations^Qopies ofthe digital f lesj>r papejeppjeso fthe FIRM panels may be 
obtained by c a H i n ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ É l ^ f e ^ ^ M ^ ^ ^ ^ B l n addition, yoiir community 
may be eligible for additional credits undèr our Community Rating System if you implement your activities 
using digital mapping files. 
3 
If your community is encountering difficulties in enacting the necessary floodplain management measures, 
we urg&you to call the Director, Federal Insurance and Mitigation Division of FEMA in Bothell, 
Washington, at (425) 487-4682 for assistance. If you have any questions concerning mapping issues in 
general or the enclosed Summary of Map Actions, please call our Map Assistance Center, loll free, at 1-
877-FEMA MAP (1-877-336-262-7). Additional information and resources your community may find 
helpful regarding the NFIP and floodplain management, such as The National Flood Insurance Program 
Code of Federal Regulations, Answers to Questions About the National Flood Insurance Program, 
Frequently Asked Questions Regarding the Effects that Revised Flood Hazards have on Existing Structure, 
Use of Flood Insurance Study (FIS) Data as Available Data, and National Flood Insurance Program 
Elevation Certificate and Instructions, can be found on our website at 
http://www.noodmaps, fema.gov/lfd. Paper copies of these documents, may also, be" obtained by calling our 
Map Assistance Center. 
Sincerely, 
William R. Blanton Jr., CFM, Chief 
Engineering Management Branch 
Mitigation Directorate 
Enclosure: 
Final Summary of Map Actions 
cc: Community Map Repository 
Mr. Tom Schauer. 
Senior Planner, City of Grants Pass 
FINAL SUMMARY OF MAP ACTIONS 
SOMA-2 
Community: GRANTS PASS, CITY OF Community No: 410108 
To assist your community in maintaining the Flood Insurance Rate Map (FIRM), we have 
summarized below the previously issued Letter of Map Change (LOMC) actions (i.e., Letters of Map 
Revision (LOMRs) and Letters of Map Amendment (LOMAs)) that will be affected when the revised 
FIRM becomes effective on December 3, 2009. 
1. LOMCs Incorporated 
The modifications effected by the LOMCs fisted below wiff be reflected on the revised FIRM, in 
addition, these LOMCs will remain in effect until the revised FIRM becomes effective. 
LOMC Case No. 
Date • 
Issued Project Identifier 
Old 
Panel 
New 
Panel 
NO CASES RECORDED 
2. LOiViCs Not incorporated 
The modifications effected by the LOMCs listed below will not be reflected on the revised FIRM 
panels because of scale limitations or because the LOMC issued had determined that the lof(s) or 
structure (&) involved we re. outside-the Special Flood Hazard Area, as shown on the FIRM. These 
LOMCs will remain in effect until the revised FIRM becomes effective. These LOMCs will be 
revalidated free of charge 1 day after the revised FIRM becomes effective-through a single 
revalidation letter that reaffirms the validity of the previous LOMCs. 
LOMC Case No. Date Issued „ Project Identifier 
Old 
Panel 
New 
Panel 
LOMA 97-10-389A 10/24/1997 
\S£RDEEN.SUHOIV, BLOCK D. LOT 4- 1714 SW 
3ROWNELL 41Ò1060003C 41033C0511E 
LOMA 98-1Q-086A 02/06/1998 
l375,fVW PROSPECT AVENUE " TAX LOT 801, 
»ORTION OF SECTION.7, T36S, R5W.W.M. \ 4101Û6QÛÛ2C 41033C0504E 
LOMA 00-10-056A 
-
12/15/1999 • 
• 
/VESTGATH SUaOlV. BLOCK1, LOTS Ö26 
COTTONWOOD STREET 4101080003C 41033C0511E 
LOMA O2-10-129A 01/09/2002 
.OWER RIVER MEAJDOWS SU8QIV PHASE 2, 
JOT 68-2156 CHAMBERS LANG 4155900237D 41Q33C0S11E 
LOMA 03-10-0134 A 01/09/2003 
3AROEM VALLEY ESTATES SUBDIV, LOT 11 -
MOB GARDEN VALLEY WAY 
4155900237D 41033C0511E 
LOMA • 03-10-0141Ä 03/13/2003 
• 
1436 SE ROGUE DRIVE - PORTION OF GOVT 
-0*4, SECTION 21. TMS. R5W. WJll. 4101080004C 41033C0516E 
LOMA 03-10-043QA 05/01/2003 
7371 NORTH APPLEGATEflOAD - PORTION 
PF SECTION 20, T37S, RSW 4155900329B 41033C0702E. 
LOMA 04-10-0474X 04/14/2004 
aARKSI DE ESTATES, LOT 4 — 1126 SW-
JNCOLNROAO . .41Q10B0003C 41Ó33C0511E 
•": ' - " ; - - '¿ - - • 
5/21/2Û09 Page 1 of 2 
SOMA-2 
FINAL SUMMARY OF MAP ACTIONS 
Community: GRANTS PASS, CITY OF Community No: 410108 
LOMC Case No. 
Date 
issued Project Identifier 
Old 
Panel 
New 
Panel 
LOMR-F 04-1Q-0627A 10/13/2004 
A/EE WILLOW SUBDIV, LOTS Z-3 - 1215 4 1211 
RONWOOD DRIVE 4155900237D 41Q33C0511E 
LOMA 05-10-0849A 11/10/2005 
1111 LUZON LANE 
\ 
4101080004C 41033C0512E 
LOMA 08-10-0194A 04/03/2008 
EAST PARK SUBDIVISION, BLOCK A. LOT 0 -
i 174 ACACIA LANE 4101Q80004C 41033C0512E 
LOMA 08-10-0014A 
35B DONEEN LANE - Sac 24, T3flS, RfiW, W.M. 
41559002370 41033C0511E 
3. LOMCs Superseded 
The modifications effected by the LOMCs listed below have not been reflected on the Final revised 
FIRM panels because they are being superseded by new detailed flood hazard information or the 
Information available was not sufficient to make a determination. The reason each is being : 
superseded is noted below. These LOMCs will no longer be in effect when the revised FIRM 
becomes effective. 
LOMC Case No. Date Issued Project Identifier 
Reason Determination 
Will be Superseded 
LOMA 02-10-047A " 11/28/2001" 
643/645 BALSAM ROAD - PARTIUON PLAT 
1996-015, PARCEL 1; LOWER RIVER 
MEADOWS SUSOIV, LOT 4 2 - 6 4 " A 
1. Insufficient information available to make a determination. 
2. Lowest Adjacent Grade and Lowes! Finished Floor are below Ihe proposed Base Flood Elevation. 
3. Lowest Ground Elevation is below the proposed Base Flood Elevation. 
A. Revised hydrologie and hydraulic analyses. 
5. Revised topographic information. 
4. LOMCs To Be Redetermined 
The LOMCs in Category 2 above will be revalidated through a single revalidation letter that 
reaffirms the validity of the determination in the previously issued LOMC. For LOMCs issued for 
multiple lots or structures where the determination for one or more of the lots or structures has 
changed, the LOMC cannot be revalidated through this administrative process, Therefore, we will 
review the data previously submitted for the LOMC requests listed below and issue a new 
determination for the affected properties after the effective date of the revised FIRM. 
LOMC Case No. 
1 Date 
• Issued .. Project Identifier 
Old 
Panel 
- New 
Panel 
i 
NO CASES RECORDED 
!• • 
- V -
— — — 
.5/21/2009'-
URBAN AREA PLANNING COMMISSION 
September 23,2009 
6:00 PM 
Council Chambers 
1. ROLL CALL 
The Urban Area Planning Commission met in regular session on the above date with Chair Berlant presiding. 
Commissioners Arthur, Kellenbeck, Fitzgerald, Richardson/Fowler and Fedosky were present. Also present and 
representing the City was Interim Community Development Director Angeli Paladino, Senior Planner Schauer, and 
Associate Planner Glover. 
2. 1T£MS FROM PUBLIC: None. 
3. CONSENT AGENDA 
a. IMPUTES 
i. ^Minutes of September 9, 2009 
Commissioner Kellenbeck stated, I'm abstaining from one of those. Do you want to break it out or do you want me to 
just vote with the group and aOctain from the one? 
Chair Berlant stated, why don't w ^ o ahead and break that out. That was the Twisted Pines, so moving the second 
Findings of Fact Twisiea Pines p h a s ^ . Let's.deal with all the other matters on the consent agenda. 
Commissioner Fitzgerald stated, on p a g ^ O of our packet tonight, in the discourse that we talked about on the text 
amendment, I found no reference to the que^ion of notification to the Commissioners, yet 1 asked that question, 
"Had the Commissioners been notified?" I do n^d my response about it, but I don't find the question on the record. 
Interim Community Development Director AngelPPaladino did state that they had been mailed twice, and this doesn't 
appear in here either. So, I'm wondering why that aWn't show up. 
Chair Berlant stated, why don't you just make an amendment to it to add that to it and then that will complete it. 
Commissioner Fitzgerald stated, actually page 48, where aoNwt midway through it says that I stated according to 
Commissioner Ellis, they have not seen this and didn't know anything about it as of this evening. Well, that's the 
answer, but the question is missing. So the question was, "Have^te Commissioners been notified about this text 
amendment and Interim Community Development Director Angeli-Peladino stated that they had been mailed it twice. 
The answer there, as I was saying... that change 1 would like to see pbi in. Board of County commissioners, yeah. 
Commissioner Richardson asked, you did not consider the statement by cN 
sufficient? Where she says, "I was wondering if the County Commissioners 
crosscheck won't happen? Was there addition to that question? 
Commissioner Fitzgerald stated, yes there was. 1 made a specific point as to whetHNc the text amendment had been 
notified and I asked the question, "Had it been notified to the County Board of Comml^ioners so that they were 
aware of what was being taken up." ^ ^ 
Commissioner Richardson stated, I understand, but isn't that what the crosscheck included^V 
Commissioner Fitzgerald stated, no, it wasn't because the text amendment dealt with the res idem« requirement 
being changed from the Urban Growth Boundary and so that was what was part of it. 
Chair Berlant stated, so, I suggest that if you ask that the minutes be amended to insert the question thaW>u asked 
then that would cure that. 
Commissioner Fitzgerald stated, that's what I'm saying is, it needs to be amended to include the question whicrSwas, 
"Had the Board of County Commissioners been notified of the text amendment changes that were proceeding a n a ^ 
r. Urban Area Planning Commission 
September 23^2009 ' 
missioner Kellenbeck ahead of that as 
d at least been noticed that the 
EXHIBITS 
7d UAVtlpnP 
characteristica^ased on the shape of the parent parcel, natural features, including trees. Condition A (2) not 
applicable, conation A (3) for the reasons stated in subsection (b) which is better achieve the public purpose allowing 
a lot arrangementTNat represents a more efficient use of land. Criterion 4, satisfied based on the section that says... 
based on purpose. ItlSjks about accomplishing the same purpose and so I would relate that back to 3 (b) for the 
purpose of achieving a ofetter public purpose and design. (She asked another Commissioner off microphone about 
combining and the conversion was inaudible) I'll combine that with a motion to approve the tentative pian for the 
subdivision. On item 15, for t n ^ h e d building on proposed lot 2, to allow that to remain until the time of building 
permits for that building only but tkleave the condition the same for the building that would otherwise split the 
property line between lots 3 and 4, chqd to add to that condition on the shop for parcel 2 that the standard code 
language that we've seen in the past afcout "if no building permit is pulled, then a demolition permit and removal of 
lhat building would be necessary within tñtó given timeframe so that there isn't an accessory building with no 
residence after a certain number of years wrKch I believe is... is it 3 years? Does that sound right? Two or three 
years? The revision to condition 1 (b) about th^CUE being allowed to go directly straight through the hammerhead. 
Commissioner Fitzgerald seconded the motion. ChatoTterlant asked for further discussion. 
Commissioner Fedosky stated, chair Berlant, I agree wittvyou on your recent reflections on needing to have flexibility 
in these areas but I guess my expectation is that there woulcNae at least one or two of these that jump out as being 
close to being satisfied. The drawings here for me contrast cleaKy, the not satisfied nature of these 3, that there are 
alternatives, and it can be developed, and there's nothing unique rMhe shape of these lots. It's just a better idea, and 
the lots will sell better, and a tree is saved. 1 agree with you but not tcSthe degree that everything in front of us is 
stretched on so far. I think that begins to deviate from our purpose a n d \ j r scope as a body. Just my opinion 
Commissioner Kellenbeck stated, I have one amendment to my motion and thaNtfas to include a condition that 
require an on-site turnaround for vehicles exiting a garage on parcel 4. 
Commissioner Fitzgerald stated, 1 amend the second. 
Chair Berlant asked for further discussion. Seeing none, he called for a vote. ^ ^ 
MOTION 
ded and 
tedosky 
Commissioner Kellenbeck moved and Commissioner Fitzgerald seconded a mot ion as ar 
the vote resulted as fo l lows: "AYES": Berlant, Arthur, Kellenbeck, Fowler, and Fitzgerald. "NAYS' 
and Richardson. Abstain: None. The mot ion carries. 
ii. 09-40500004 & 09-40500006: Flood Hazard District - Special Purpose District Map 
Amendment and Development Code Text Amendment 
Proposal: Special Purpose District Map Amendment and Development Code Text 
Amendment to adopt the new Flood Insurance Study (FIS) and Flood Insurance 
. Rate Maps (FIRM) issued by the Federal Emergency Management Agency (FEMA) 
dated December 3, 2009. The proposal amends Article 13 of the Development Code 
related to the flood hazard district. In addition, the narrative in Element 5 of the 
Comprehensive Plan is updated to reflect the new FIS and FIRM maps. 
Applicant: City of Grants Pass 
Planner: Lora Glover 
Chair Berlant stated, at this time we will begin the hearing with a Staff report followed by a presentation by- the 
applicant, statements from persons in favor of the applicant, statements by persons in opposition to the application, 
and an opportunity for additional comments by the applicant and Staff. Once that has occurred, the public comment 
portion will be closed and the matter will be discussed and acted upon by the Commission. 
Chair Berlant asked if there is anyone present who wishes to challenge the authority of the Commission to hear this 
matter. Seeing none, Chair Berlant asks if there are any Commissioners who wish to abstain from participating in the 
hearing or declare a conflict or a potential conflict of interest. 
Urban Area Planning Commission 
.September 23, 2009 
16 
[Commissioner Arthur made a comment off microphone. The comments were inaudible] 
Chair Berlant stated, I would say that certainly I received notice that my property might be affected by this 
amendment. In reviewing it, actually, I don't think this amendment has any effect on my property so I don't think there 
is any either actual or potential conflict for me. 
Commissioner Arthur stated, and I have the same thing. I also received a notice and being up on the hill behind here 
I don't think I'm in any imminent danger of anything. 
Are there any Commissioners who wish to disclose discussions, contacts, or other ex parte information they have 
received prior to this meeting regarding the application. Seeing none, Chair Berlant states that in this hearing the 
decision of the Commission will be based upon specific criteria which are set forth in the Development Code, all 
testimony given which apply in this case are noted in the Staff Report. If anyone would like a copy of the Staff 
Report, please write that in a note to me and one will be provided to you. It is important to remember that if you fail 
to raise an issue with enough detail to afford the Council and the parties an opportunity to respond to the issue, you 
will not be able to appeal to the Land Use Board of Appeals (LUBA) based on that issue. Chair Berlant states the 
hearing will now proceed with a report from Staff. 
Associate Planner Glover stated, good evening again. As we start tonight there is a lot of information in the packet 
and I'll try to guide us through it. We are doing several parts to this. There are various components. We're looking at 
the Flood Hazard District Zoning Map Amendment, the Special-Purpose District Map Amendment, and the 
Development Code Text Amendment. This procedure is a type IV. That is a Planning Commission recommendation 
forwarded to the City Council for their'final decision, and that hearing is set for November 4,1 believe it is. It will be at 
six o'clock. Tonight this is a recommendation decision, it is not a final decision for you. The proposal again includes 
amending the purpose of the Special-Purpose District Map for the flood hazard to adopt the flood insurance study 
volume 22. Those are referenced throughout the material as the FSI, and the flood insurance rate map, the FIRMs 
for Josephine County. The amendment also includes adopting a new section 13.200, the flood hazard district as the 
Development Code, and then also to update Element 5 of the Comprehensive Plan referencing the new FIS and 
FIRM with an effective date of December 3, 2009. The City of Grants Pass as you "know participates in the National 
Flood Insurance Program. By doing so our residents are able to obtain flood insurance from this program. The 
Federal Emergency Management Agency which is FEMA has recently completed the process of updating our current 
1991 FIS and FIRM maps. The purpose of the new FIS is to revise and update the information on the existence and 
severity of flood hazards in Josephine County to include the incorporated areas of Cave Junction and the City of 
Grants Pass. The County is also in the process of adopting the City map, they are not separate maps anymore. So 
as we gó through any expansions later on to the City we will have already adopted those maps. We won't have to go 
through the process again to pick up small segment along the way. I'll mention this again but, the flood hazard areas 
are for the Rogue River and also for Gilbert Creek so Commissioner Arthur that's probably why you picked up that 
notice. It was off of Gilbert Creek. 
On June 23, 2009, this was in sense a sudden notice, we've been working through this process but we knew 
the study was happening, but on June 3, 2009 FEMA mailed their letter of final determination instructing the City that 
the new maps and study must be adopted to maintain our participation in the flood insurance program by no later 
than December 3, 2009. Adoption of the FIS and FIRM requires that the Element 5, the Comprehensive Plan, be 
updated; All of these documents are interrelated. So what one references, we all need to blend it together, and so 
with the new FIS and FIRMs we need to make sure we're referring to the December 3, 2009 version. In addition, the 
new FIS requires the update of the Development Code, specifically standards of paragraph 60.3d of the National 
Flood Insurance Program Regulations. Most of this pertains to the crawl space requirements and how those are 
constructed. 
This is an example. I'm not sure how well the audience can see. On the left is the existing FIRM map 
showing the light blue as the flood plain and then the floodway in the dark blue. Vou can see on the new maps there 
is a difference... we're looking at the Webster-Lincoln road area around the All Sports Park also. The floodway fringe 
or the floodplain as a lot of folks noticed there is an elevated area in the center that is still clear. It's outside of that 
hazard, and the floodway stays pretty close to the existing. This is just one example. We are finding a lot of areas 
where the impacts are (ess on property owners though there are few areas that they have little bit moré of a flood 
hazard noted on them. I would encourage at this point... I do not have air of the maps available on the computer here, 
down here at this office, hut you aré welcome to come into our office and we can print out a map for you of your 
Urban Area Planning Commission 
.September 23, 2009 
17 
specific lot to compare. We do have the large maps here tonight. 
Commissioner Richardson stated, the question is I guess, in the old version of the existing flood maps everybody in 
the blue area and everybody in the pale yellow area was required to have flood insurance in the old map or the 
existing one, and now in the new one people that used to have to have flood insurance don't need it but these people 
in floodway fringe are now going to be required to have flood insurance. Is that the basic impact of this? 
Associate Planner Glover stated, required... generally it will be coming to their lender. If they have a loan on their 
property their lender would require it. Part of the difference to is, again we're showing a lot of area in the new map 
that is now outside of that flood hazard, so based on these maps, the lenders for those home sites would not 
necessarily require the flood insurance. It also gives an opportunity now for people that may not have been reflected 
in the flood hazard under the old map that maybe now are reflected in it, they can get the insurance today under 
today's standards, which those might change if they have to prove elevation later on. So it gives an opportunity for 
those folks to cut their insurance people. 
Commissioner Richardson stated, right. 1 guess what I'm saying is, at this point people who have mortgages based 
on this new one, are likely to get a notice from their lender that says, "You're going to have to have and pay for flood 
insurance." If you own a house in this that you own free and clear, you need to go think about purchasing flood 
insurance. So we've sent out notices... 
Associate Planner Glover stated, we sent out over 1000 notices to people within the flood hazard or Rogue River and 
Gilbert Creek. But again, even under the existing maps those folks within the flood hazard, their insurance providers 
more than likely require them to have flood coverage. So it's not having flood coverage is a new requirement, it's just 
some people may need it now but didn't before or now in this particular map, there's probably quite a few... some of 
these new subdivisions off of Lincoln area that no longer require it based upon these maps. So the requirement to 
have flood insurance is not a new requirement. 
Commissioner Richardson stated, right, I understand that. Just that in looking at them there is a dramatic difference 
between those two before and after. 
Associate Planner Glover stated, it's much better in this example for most of the people in the middle that are outside 
of that flood hazard now 
Commissioner Richardson interrupted, exactly. It's the folks that are now in the floodway fringe who thought they 
were secure, who possibly have an issue. 
Associate Planner Glover stated, we can overlay these maps in the office and this is what I was trying to show too. 
It's little bit hard, I keep losing my arrow. As you come up to this area, that's about the same area that's here. This 
scale is a little bit off. So this floodway fringe has not moved dramatically. Most the time it has reduced down. It's just 
that it's reduced down here in the center. All of this center is out, where before it was inside. So we're finding that on 
the majority, the impact is less severe for most properties. But again I would encourage people to come to the office, 
and we can show them the before and after. I just thought it would be a little bit too much color to lay them on top 
tonight. I did want to give you a little perspective though. I got these copies of these maps in 1964 courtesy of the 
County. This is Webster and Lower River Road area. You can see the Water and how it inundated the land through 
that area in and crossed over onto South River road side. This is West Park street. Actually this is East Park street. 
This Is East Park Street running down through here and then West Park Street there. This is Rogue River Highway 
and then you can see M Street. The next one is my favorite map. This is my mother's house off of Rogue Drive. This 
is the Portola area, down in the corner. This is Herrick coming down, and then Lela coming through. So we have one 
of my neighbors here that didn't have water in his house in the 1964 flood. 
So the NFIP , the National Insurance Program has been in existence since the passage of the National Flood 
Insurance Act of 1968. We have over 700 communities in the Pacific Northwest participating in the program. In 1973 
flood insurance became mandatory as a condition of any federal or federally related assistant. This generally related 
to... for the loans. FEMA conducts hydrologic and hydraulic analysis and prepares the flood plain maps and provides 
those to the participating communities. The combination of insurance and mitigation through floodplain management 
provides a powerful combination to help safeguard our residents. The plane managing and via ordinances and 
development standards is a mitigation vice because insurance cannot do the work alone. Participation in the NFIP 
brings a number of benefits to the community. Residents are able to purchase and renew their flood insurance policy. 
Urban Area Planning Commission 
.September 23, 2009 
18 
The City of Grants Pass participates in the community rating system, it's a voluntary rating system that 
qualifies our residence for lower flood insurance premiums as a result of education outreach and measures to reduce 
flood losses. FEMA will also come through and inspect our records and we report to them, I believe on an annual 
basis of the information we provide. NFIP insurance provides an additional $30,000 from FEMA for reconstruction to 
meet current standards. This is specifically helpful on older homes that may have built to code originally. 
If we are suspended from the program, we face the following consequences: Existing policies will not be 
renewed. No federal grants or loans for building may be made in identified flood hazard areas. Federally backed 
mortgages such as Fannie Mae, Freddie Mac, or FHA also require NFIB insurance. So that could limit our housing 
industry. No federal disaster assistance may be provided to repair any buildings located in the flood hazard areas 
unless we are participating in the program. In addition, if we are suspended and then go back to get reacted again, 
there is a 30 day waiting period for flood insurance. This could be critical if we don't respond in time... December 3. It 
would be into January or February possibly before we would have flood insurance again and that's normally our bad 
season, our wet season. Non-NFIB insurance companies will not cover more than one claim for disaster. Non-FIP 
providers are hard or difficult to find and are often very expensive such as Lloyd's of London. They had a very small 
high risk pool with high premiums. As we go through this with the different amendments we have to address the 
criteria for us, and this is how the development code for zone map amendments... 
Section 4.033 of the development code is specific to zone map amendments. We needed to acknowledge 
this though we did not feel it was applicable because it's not related to a specific zone, however the adoption of the 
new FIS and FIRM maps will result in a map change to the flood hazard. A special district. As you are aware we 
have several Special-Purpose Districts in the Development Code. Again the amendments affect properties along 
Gilbert Creek and the Rogue River. Section 4.044 of the development code, flood hazard district map; this is 
satisfied. The flood boundary floodway is established by FEMA. The flood hazard district map may be amended only 
by FEMA. Upon receipt of authorization from FEMA the Director shall begin administering the flood hazard district as 
designated by FEMA. 
Back again to our directive on June 3, 2009, we received or were mailed their letter of final determination 
instructing the City to adopt the new FIS and FIRM maps by December 3, 2009. Section 4.103 of the Development 
Code Proposed Amendment is consistent with the purpose of the section and article. This criteria is determined be 
satisfied. The proposal amends section 13.200, the flood hazard district, and is consistent with the purpose 
statement. The amendment will consolidate various flood ordinances in the municipal code and the development 
code. It will provide additional terms and definitions for the flood hazard, bring construction standards for crawlspaces 
and below grade crawlspaces into compliance. One of the goals of this amendment will bring the municipal code and 
various resolutions and ordinances that have been passed over the years will consolidate all of that into the 
development code so we don't have various documents to research through, or that may have conflicting or outdated 
language in. So it will all be rolled into this amendment.. 
The final packet before the City Council will have a draft ordinance available for them noting which 
documents are going to be updated or canceled at that point. I'm losing the word that I wanted. So, at this point, it's 
Staff recommendation that you make three motions recommending approval to the City Council. The first is to amend 
the Special Purpose District Map for the Flood Hazard District by adopting the current insurance study, the FIS 
volumes 1 and 2, and the Flood Insurance Rate Maps, the FIRMs for Josephine County and incorporated areas 
effective date December 3, 2009, issued by the Department Homeland Security's Federal Emergency Management 
Agency (FEMA). The next motion would be the Urban Area Planning Commission recommend that the City Council 
approve the proposed amendment section 13.200, the flood hazard district of the City of Grants Pass development 
code to be consistent with the National Flood Insurance Program and the Oregon Model Code Provision. Finally, the 
third motion be the Urban Area Planning Commission recommend that City Council approve the amendment to 
update Element 5, the Comprehensive Plan, specifically section flood hazard 5.30, to reference the new FIS and 
FIRM maps effective December 3, 2009. 
I'll jump back up real quick because we didn't really discuss it in the Staff Report, the Oregon Model Code 
Provisions. This is just kind of the guide that was developed via the department DLCD. It consolidated all the federal 
and state regulations into kind of a checklist for us to go through to make sure that we had all the parts that we 
needed to do which is what was rolled into the amendment for article 13. After that I'll open it up to questions for you. 
Chair Berlant asked if anyone wanted to speak to this issue. Seeing none he closed the public hearing portion and 
turned it over to the Commissioners. 
Urban Area Planning Commission 
.September 23, 2009 
19 
Commissioner Richardson stated, when we just taik about Gilbert Creek and the Rogue River obviously we have left 
out other of the major feeders of the Rogue River. I'm thinking of Sand Creek and Allen Creek and all of the rest of 
them, and those folks in Atlanta that are seeing this traffic flooding. I know in many places flooding happens 
someplace else and it can be a perfectly sunshiny day where you are and melting in and around the Crater Lake that 
can cause flooding to occur here in Grants Pass. Is that the only kind of situation that FEMA deals with or do they 
deal in just addressing these areas with an idea of a sudden downpour that is so severe that literally the ground 
cannot handle it? 
Interim Community Development Director Angeli-Paladino stated, I don't know that we know that answer. 
Associate Planner Glover stated, I do know flood insurance is available to all of us in a sense because flooding 
happens. It could be an example like that, or an erosion or drainage problem. So the flood insurance program... and 
if we do this part of it, it still provides the opportunity for all of our residents to achieve flood insurance. 
Commissioner Richardson stated, right, I guess though as far as FEMA is concerned, it's to handle a flood event in 
the rivers as opposed to a.... What is it? Atlanta got, 24 inches of rain in just a matter of 4 or 5 hours -- a tremendous 
downpour — so they had flooding in places that they had never had flooding before. 
Chair Berlant stated, I'm not sure but 1 think FEMA covers all of those and this is just trying to look at the most likely 
areas and more mandate that there'll be coverage or at least protect themselves if they're going to. 
Commissioner Fitzgerald stated, this is the concerns of the federal agencies that will require like FHA and all of the 
programs, Rural Housing programs and others that all fall under FHA guidelines in the secondary market which is 
Fannie Mae and Freddie Mac, all of them will require these be applied and that's why it really is a perfunctory type of 
administrative deal. If we don't have... the City does not adopt them, those programs are not available to our citizens. 
It's just that simple. 
Commissioner Fowler asked, and am I to understand that even if you're not living in one of the designated shaded 
areas you're still eligible for the federal subsidiary or whatever the group insurance is? 
Associate Planner Glover stated, yes you can still obtain federal insurance. The studied areas is... when again like a 
lender would come through and say, "You are in a designated flood area, you have to have it if you want our loan.", 
but otherwise they obviously recommend a lot of times that people that are concerned or on a smaller tributary 
should have the flood insurance. 
Commissioner Fitzgerald stated, it doesn't change the flood certs that you can obtain from a surveyor which will give 
you 1 foot... the bottom of the being 1 foot above the flood stage. So anybody that has those flood certs will 
have to make sure that nothing is changed on the new maps. So I would think it would.... Is there something that we 
are going to send out as a City? A website or something that alerts people to the fact of having those flood certs 
perhaps reevaluated to make sure they are okay with the new maps? 
Associate Planner Glover stated, well, we will be sending out another notice on this application — I believe a decision 
notice with more information there and their contacts information too. Again, we sent out over 1000 notices for all 
along that hazard area along the Rogue River. We'll be noticing the insurance companies. A lot of them are already 
aware of it. They're getting their new maps on their own and they have started calling and also on this. 
Commissioner Fitzgerald stated, I was just wondering about the flood certifications. A lot of times homeowners don't 
realize they have them. Especially if they bought a new home that was done by the developer who built the homes, 
put that in and had all of the crawjspaces flood certified like I did at Schaeffer's. We flood certified every one of those 
because of it. We should perhaps put something in there to have them contact the person that did that if they have a 
flood certification to make sure it hasn't changed. It would be a terrible shame if they had a flood certification they 
thought, and with this new map it's not exactly correct or doesn't work for them just to have them check it. Not that we 
are trying to inherit.some liability but it might be a good idea just to tell them if they had a flood certification that they 
should have it reestablished or rechecked to make sure it's still effective-
Commissioner Richardson stated, you know it seems to me that the monthly newsletter that comes out with the 
sewer news would be a wonderful opportunity to remind everybody to have it checked. 
Urban Area Planning Commission 
.September 23, 2009 
20 
Chair Berlant stated, and it looks like you want 3 separate motions on this Associate Planner Glover? 
Commissioner Fitzgerald stated, I'll make those motions if you want Commissioner Berlant. 
Associate Planner Glover stated, you can do it separately or if you're going to approve all of them then 1, 2, and 3 of 
those items... 
Commissioner Fitzgerald interrupted, do you want them separate Associate Planner Glover? (Associate Planner 
Glover stated, if you just at least reference those) Do you want me to read a, b and c? (Associate Planner Glover 
stated, that's fine) I make a motion that we would first recommend that the Urban Area Planning Commission 
recommend to the City Council to approve the amendment of the Special-Purpose District Map of the flood hazard 
district by adopting the current flood insurance study FIS volumes 1 and 2, and flood insurance rate maps (FIRM) for 
Josephine County Oregon and incorporated areas, effective date December 3, 2009 issued by the Department of 
Homeland Security's Federal Emergency Management Agency (FEMA). Do you want me to do all of them? Okay. 
B. It is recommended that the Urban Area Planning Commission, I would make a motion that we would 
recommend the City Council approve the proposed amendment to section 13.200 Flood Hazard District of the City of 
Grants Pass development code to be consistent with the National Flood Insurance Program (NFIP) and the Oregon 
Model Code provisions. 
C. I make a motion that the Urban Area Planning Commission recommend that the City Council approve the 
amendment to update Element 5 of the Comprehensive Plan; specifically the section under Flood Hazard 5.30 to 
reference the new FIS and FIRM effective December 3, 2009. 
Chair Berlant called for a vote. 
MOTION 
Commissioner Fitzgerald moved and Commissioner Richardson seconded the mot ion to recommend 
approval for the above noted amendments (A, B, and C) as stated and the vote resulted as fo l lows: "AYES": 
Berlant, Arthur, Kellenbeck, Fedosky, Fowler, and Richardson. "NAYS": None. Abstain: None. The mot ion 
carries. 
iii. 09*40500002: Comprehensive Plan Text Amendment 
Propo&qh - Proposed amendment to the Comprehensive Plan adopting a new Urbanization 
Element 
Applicant: >viCity of Grants Pass 
Planner: senior Planner Schauer 
Chair Berlant stated, at this time we wilh^egin the hearing with a Staff report followed by a presentation by the 
applicant, statements from persons in favoSqf the applicant, statements by persons in opposition to the application, 
and an opportunity for additional comments b^t^e applicant and Staff. Once that has occurred, the public comment 
portion will be closed and the matter will be discussed and acted upon by the Commission. 
Chair Berlant asked if there is anyone present who wisn^to challenge the authority of the Commission to hear this 
matter. Seeing none; Chair Berlant asks if there are any CoKjmissioners who wish to abstain from participating in the 
hearing or declare a conflict or a potential conflict of interest. Sb^ing none, are any Commissioners who wish to 
disclose discussions, contacts, or other ex parte information they ra^e received prior to this meeting regarding the 
application. Seeing none, Chair Berlant states that in this hearing thetiecision of the Commission will be based upon 
specific criteria which are set forth in the Development Code, all testimon^iven which apply in this case are noted in 
the Staff Report. If anyone would like a copy of the Staff Report, please writNbat in a note to me and one will be 
provided to you. It is important to remember that if you fail to raise an issue witfissnough detail to afford the Council 
and the parties an opportunity to respond to the issue, you will not be able to appeaNo the Land Use Board of 
Appeals (LUBA) based on that issue. Chair Berlant states the hearing will now proceecN(ith a report from Staff. 
Senior Planner Schauer stated, I'll talk in a minute on procedural things for this are little bit difhs^nt so I'll talk about 
that as part of the presentation in terms of appeals. This is a continuation of the hearing on the Uhs^inization Element 
Urban Area Planning Commission 
.September 23, 2009 
21 
before the Planning Commission and poreqtially sooner. The room will probably be a little fuller than the floodplain 
tonight. 
8. • ADJOURNMENT 
There being no further business to come before the Commission, Chair Berlant adjourned the meeting at 
9:30 p.m. 
Gary Berlant, Chair 
Urban Area Planning Commission 
Date ' 
These minutes were prepared by contract minute taker, Wendy Hain 
Urban Area Planning Commission 
.September 23, 2009 
35 
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City of Grants ?^|fS;^Snicipal Code 
Titflm^ 
Chapters: 
LAND DEVELOPMENT AND PUBLIC IMPROVEMENTS 
GENERAL PROVISIONS 
9.01 City Utility Easements (Ord. 5197,2003) (Ord. 5434, §5,2008) 
9.04 City Building Code - 2000 (Ord. 5012 §2,2000 & Ord 5468 §15 2008) 
9.08 Garage Sales and Yard Sales 
9.12 Prohibition of Fireworks, UFC Section 78.102 Amended. 
9.13 Open Burning Prohibited (Ord.4982§1,1999;ord.5229,2004,Ord.5379,2006) 
9.16 Building Moving (Ord.4833§3,1995) 
9.21 Sign Standards (Ord.4952 §2, 1998; Ord.4974§1, 1999, Ord. 5248, 2004, 
Ord. 5325, 2005, Ord. 5393 §3, 2007) (Ord. 5434 §5, 2008) 
(Ord. 5267 § 5, 2004, repealed in its entirety) 
II. TRAILERS AND TRAILER PARKS 
9.25 Ballot Measure 37 Procedures 
9 . 2 8 Recreational Vehicles (Ord. 5349 §15,2006) 
(Ord. 5267 § 5, 2004, repealed in its entirety) 
III. PUBLIC IMPROVEMENTS 
9.36 Public Improvements 
9.37 Prequalification Requirements (Ord. 4752 §1,1992) 
9.40 Reimbursement Districts for Public Improvements (ord. 5439§2.2008) 
9.44 Off-Street Parking Facility Assessment 
IV. MEASURE 7 
9.52 Definitions 
9rêA—Construction Standards 
9.99 Claims Filed Under Ballot Measure 7 (Ord. 5037 §1,2000) 
Title 9: Land Development & Public Improvements 
Title 9 Last Revised 7/03/2009 
Page 1 of 25 
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State of Oregon 
Countu-ofJq^eph ine 
Before mer 
On this the. M . day of ' r j " u — — o — y v 
w ' he undersigned Notary Public, personaffy appearedSCtoaLf t 
i Name of Notary Public 
^ personally knW/n to me 
Ñáfne of Sigr^) I ¿S 
^ T ) proved to me on the basis of satisfactory evidence 
to be the person(s) whose name(s) is/are subscribed to the within instrument, and acknowledged that he/she/they 
executed it. 
ITNESS my hand and officiai seak 
SignaturètlfNotaryYîiiblic 
OFFICIAL SEAL 
KARÊN 0 LAWRHNCE 
NOTARY PUBLIC-OREGON 
COMMISSION NO. 441729 
WCOMMISSIOM EXPIRES SEPTEMBER 18,2013/ 
/ i / o v / o ? 
To Whom It May Concern: 
The new FEMA update places my property fronting the Rogue River in Grants Pass, . 
OR.in a "Special Flood Hazard Area." I have carefully sought out all information 
possible regarding the dividing of my property for these past ten years of ownership. 
The prospects of developing a separate river lot has been a reality with my providing 
water and sewer. As indicated on the map of new FEMA update, the revised flood 
area now comes up to my roof-line, where before it covered a very small margin. 
The potential river lot appears to be almost entirely covered by the flood area, with no 
hope for its future development. Those at the planning dept. tell me, of course, that I 
will just have to hire an engineer - which would have been necessary in the previous 
situation, but with resulting possibilities. As I understand it, any new construction on 
my home is not possible. I have had plans drawn up and waiting to add a much needed 
guest room, as my home has only one bedroom. Those plans must now be cancelled. 
I have consulted an engineer regarding an elevation certificate. I am considerably 
above the river, and feel compelled to attempt to dispute the FEMA findings, but in so 
doing is the probable loss of funds required and the long and difficult process in all that's 
involved in an appeal. 
I was born in this area 77 years ago. Only the past ten years were spent on this river, 
but I know the history of its flooding and of this property. Through two very major floods 
the water barely rose to just the floor of the basement level. Now with The Lost Creek Dam 
in place there has not been such flooding. 
At the council meeting, September 23rd, in which I did not participate, being unprepared, 
this agenda of the new FEMA update was presented as a wondrous opportunity for every-
one to purchase flood insurance with this national program in place; that would make it 
more affordable (and a requirement for those involved with loan institutions.) .... more 
affordable, perhaps, for those who feel the need for flood insurance — I do not! 
In the event I must sell my property at some future date, or at such a time when my 
children should receive their inheritance, the prospect of potential buyers is greatly re-
duced due to these drastic restrictions, and severely effect my property's value. 
REC 
Thank you, 
Nadine Ham 
2215 SE Portola Dr 
Grants Pass, OR. 97526 
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