Kristof, Evan2021-10-142021-10-142021-06https://hdl.handle.net/1794/26758105 pagesSE Sandy Avenue is located in a suburban neighborhood acting as a local collector street that serves as a secondary route to navigate a steep hill. Historically, Troutdale has been attempting to create a trail connecting Gresham and Troutdale with a 40 mile loop since 1903. SE Sandy Ave has been considered a candidate for one of the trail alignments. Other initiatives such as the Sandy River Access Plan have interest in completing the 40 mile loop, and improve the accessibility of underserved communities to this unique institution.A geotechnical study in 2018 conducted by the engineering firm Shannon & Wilson found that the hillside along SE Sandy Ave between SE 3rd Streetand SE 4th Street was unstable and susceptible to landslides. There is a distressed area of pavement near the SE 4th St intersection. The cracking likely began sometime prior to 2001.Shannon & Wilson recommended some form of treatment to be completed on the hillside to prevent catastrophic damage from occurring.However, due to the hillside conditions, a geotechnical solution involving mitigation of the slope would be a high expense.The 2021 Troutdale Sandy Ave Conversion (SAC) PSUCapstone group was tasked to propose alternative transportation and geotechnical solutions. Four transportation and three geotechnical alternatives are outlined in this report. With the City of Troutdale’s input, the SAC team's alternative analysis found that a conversion to a multi-use road featuring one lane of motor vehicle traffic and a two-way cycle track would best serve the community. This solution is a balance of cost, safety, and accessibility that allows local residents vehicle access to their homes while also enhancing the safety of cyclists. Three intersections would undergo changes to accommodate the new cycle track at SE 3rd St, SE 4th St, and SE 8th St intersecting with Sandy Ave. The Northbound motor vehicle travel lane would remain intact while the southbound lane would be converted into the cycle track. The direction of traffic was chosen due to the location of emergency vehicle facilities and their ability to gain access to locations along Sandy Ave. For the geotechnical solutions, a design roadmap is outlined in this report. The solution chosen was reinforcement to the distressed pavement using geosynthetic mesh along the segment of Sandy Ave between 3rd St and 4th St. Cost and client opinion drove the design decision. This solution enables the City of Troutdale to make a short term fix to fracturing pavement. A roadmap laying out the steps, expectations, concerns, and construction information is included within this report.This report outlines a preliminary design at 30% completion.The team acknowledges that the proposed design solution shall be revised and modified.en-USCreative Commons BY-NC-ND 4.0-USTerminal Project