A Juvenile Fish Bypass Program at Columbia River Basin Projectsby Doug Arndt, US Army Corps of Engineers, Portland, OR, USA,
Abstract: Hydroelectric development in the Pacific Northwest region has altered the natural flow of the Columbia River and its major tributary, the Snake River. This has proven to be detrimental to juvenile salmon and steelhead migrating downstream to the ocean. The Corps of Engineers has implemented measures to help the juvenile fish safely pass its projects. These measures include 1) mechanical travelling screen bypass systems; 2) Transportation of the juvenile fish by barge and truck around the projects to a point below the lowermost dam; 3) flushing the fish through spillways; and 4) Ice/trash sluiceway flows to skim the juvenile fish from the forebay. Additional facilities are being investigated which will provide improved bypass efficiencies at the projects. Extent of and schedule for these proposed facilities will be based upon an adult fish survival benefit analysis using a computer-based survival simulation program.
Subject Headings: Fish management | Rivers and streams | Basins | Flow simulation | Hydro power | Steel | Flow measurement | Spillways | River flow | Pacific Northwest | North America | United States
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