Santa Cruz, CA
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  Portland, OR
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Seestrom Tidal Floodplain Restoration

Seestrom imageClient: U.S. Fish and Wildlife Service

The Seestrom Tidelands Restoration project will construct approximately four miles of tidal floodplain channels and restore fish access and tidal flows within a 300-acre working pasture property in the lower reach of the Coquille River, Oregon. Conversion to pastureland at the site began in the early 1900s with the clearing of native forest, construction of levees and linear drainage ditches, and installation of tidegates, which are currently in disrepair, preventing active tidal flows and fish movement.

This “Working Lands” project will balance habitat improvement with improving agricultural conditions by building two large concrete box culverts with muted tidal regulators (MTRs), excavating new tidal channels, filling drainage ditches, and re-establishing fish access to the floodplain. The project area is privately owned by a local family and will continue to function as a sheep and cattle ranching operation following project construction. Waterways was contracted by the US Fish and Wildlife Service to support USFWS, Oregon Department of Fish and Wildlife, and the Coquille Watershed Association in their efforts to accomplish this goal by conducting technical feasibility analysis, hydraulic analysis, engineering design, permitting and construction oversight for the project. Waterways’ used 2-D hydraulic model to ensure that the design met geomorphic, hydraulic, and fish passage objectives, and minimizes the hydraulic risk to the MTR culverts. Construction is expected to occur in two phases in 2019 and 2020.

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