Evaluation of extended-length submersible bar screens at Bonneville Dam First Powerhouse, 2000
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Submersible traveling screens (STSs) are installed in all turbine units at Bonneville Dam First Powerhouse to guide juvenile salmonid migrants into a juvenile fish bypass system. In tests conducted from 1989 to 1992, fish guidance efficiency (FGE) ofthese screens ranged from approximately 40% for yearling chinook salmon to 60% for coho salmon and steelhead during the spring migrations. During the same testing period, FGE for sockeye salmon was approximately 25%. During the summer migrations, FGE for subyearling chinook salmon was approximately 40% in June, then decreased to less than 10% by the second week in July. Contract no. W66QKZ80545753
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NOAA
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2025-12-23
