Mapes Creek Fish Passage and Restoration

The new bridge ensures unrestricted passage for salmon and other aquatic creatures and enhances stream function. In addition, it meets seismic safety standards and eliminates concerns about debris blockages, thereby reducing maintenance costs.

The ESA team provided a full-service design team that included hydrologic and hydraulic analysis, topographic surveying, geotechnical engineering, structural engineering, and restoration design services. The team started with a careful evaluation of hydraulic design parameters, fish passage water velocities and depths, and potential floodplain impacts. In addition, ESA coordinated with the Oregon Department of Fish and Wildlife (ODFW) and National Oceanic and Atmospheric Administration (NOAA) Fisheries to develop site-specific fish passage designs and obtain approvals.

ESA assisted Tillamook Estuaries Partnership in obtaining grant funding from several sources including the Oregon Watershed Enhancement Board to carry the project through construction and post-monitoring. Subsequently, prepared final construction documents, assisted with permit applications, and provided engineering services during construction.