Clackamas County received State Funded Local Project Program funds to replace the existing bridge on Canby Marquam Highway over Bear Creek. The existing bridge, built in 1960, is showing signs of decay as a result of heavy truck traffic. The bridge is considered functionally obsolete (narrow) and structurally deficient, with a sufficiency rating of 27.2. The bridge is composed of undersized timber members that have shear and flexure damage, which were temporary repaired until the bridge can be replaced. The asphalt pavement wearing surface requires constant repair due to the bridge vibrating and shaking when trucks travel on the bridge.
The replacement bridge is anticipated to be a new precast, concrete single-span structure spanning Bear Creek on or near the current alignment. It is anticipated the new bridge will be approximately 81 feet long with a total width of either 36 or 40 feet (two 12-foot wide lanes and two 6 or 8-foot wide shoulders). The County hired a consulting engineering firm to design the new bridge improvements.
Current activities: Surveying, geotechnical explorations, and environmental assessments on and near the roadway in spring-summer 2020.
Schedule: Project design is underway and will be completed in the spring of 2021, with construction planned for the summer of 2021 or spring of 2022.
Project impact on traffic:
- During spring-summer 2020, there will be occasional lane closures for surveying, geotechnical explorations, and environmental assessment work.
- A full road closure is expected during construction.
Engineer: Joel Tubbs, PE (David Evans & Associates)
Contractor: David Evans & Associates
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There will be meetings and other opportunities for the public to learn more about the planned repairs, including the construction schedule, as that information becomes available. Notices will be sent to area residents and property owners at key points during the process.
- Estimated total project cost: $2,313,800
- Funded through State Funded Local Project Program Funds matched with County Road funds