Chewuch Diversion Dam Renovation Project
This project removed a fish passage impediment on the Chewuch River through improvements to the Chewuch Canal diversion. Work included installation of a headgate control, improvement of the existing dam, and construction of a new fish passage channel. As a result, approximately 50 river miles were opened to unimpeded low flow fish passage.
Description: This project is located on the Chewuch River, a tributary of the
Methow River, and targeted Chinook salmon, summer steelhead, and bull
trout - species that are listed as "endangered" or "threatened" under the Endangered Species Act (ESA). Key partners in this project included the Chewuch Basin Council, Methow Salmon Recovery Foundation,the Chewuch Canel Company, the Washington Department of Fish and Wildlife (WDFW), U. S. Fish and Wildlife Service, Bureau of Reclamation, Okanogan County PUD Douglas County PUD, Salmon Recovery Funding Board, and the Bonneville Power Administration (BPA).
Objectives included rebuilding an inadequate fish passage structure and renovating the existing dam and headworks to met current fish passage and exclusion standards.
The project created a roughened channel for fish passage at the diversion dam, prevented adult fish from spawning in the inlet canal, installed an openable headgate to prevent unregulated flows down the inlet canal, and built a new dam crest 12" higher to eliminate the need for flashboards except during extreme low flows.
Funding Status: Funding received through Salmon Recovery Funding Board, BPA, Douglas County PUD, WDFW.