Northwest Fisheries Science Center

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Document Type: Contract Report
Center: NWFSC
Document ID: 8853
Title: Fish guiding efficiency studies at Ice Harbor Dam, 1987
Author/Editor: Dean A. Brege, George A. Swan, John G. Williams
Publication Year: 1988
Publisher: National Marine Fisheries Service
Contracting Agency: U.S. Army Corps of Engineers. Walla Walla, Washington

This study was conducted by the National Marine Fisheries Service in conjunction with the U.S. Army Corps of Engineers to evaluate the potential guidance of a prototype installation of submersible traveling screens (STSs) at Ice Harbor Dam.  Objectives of the study were to determine fish guidance efficiency of STSs for spring and summer migrants, evaluate the benefit of a 6-m (20-foot) raised operating gate, and estimate theoretical fish guidance efficiency from vertical fish distribution measurements.  Based on evaluations in 1987, we found that: 

  1. For yearling Chinook salmon and steelhead, mean FGEs were approximately 78 and 92%, respectively.  These values represent reasonable estimates of the guidance levels that could be expected if an STS bypass system were installed at Ice Harbor Dam.
  2. For subyearling Chinook salmon, additional field research is necessary to determine the potential guidance ability of STSs for these fish due to insufficient numbers of these fish during the testing period.