columbia river basin fish and wildlife program annual ...

7.157.15 ONGOING DRAWDOWN STUDIES(Continue Cooperative Studies; Present Results to Council. SubmitRecommendations by March 1, 1988.)903(b>(3-4)[Abstract] BPA shall fund research to develop operatingprocedures for Libby and Hungry Horse, including establishmentof reservoir levels to protect resident fish and development ofalternative means to resolve conflicts between drawdown limitsand requirements for fish flows by means of the water budget.BPA shall submit results to the Council by March 1, 1988.Mitigation projects shall be identified in the Flathead Basin inrelation to construction and operation of Hungry Horse. Resultswill be submitted to the Council by November 15, 1987.ACTION ITEM ACTIVITY SUMMARY:Objectives:To determine the effects of reservoir operations on fish in Libby andHungry Horse Reservoirs. Identify mitigation projects in theFlathead Basin in relation to construction and operation of theHungry Horse hydroproject.Background and Progress to Date:Plans:Projects at Libby and Hungry Horse Reservoirs have been funded since1983. Both projects were designed to document the effects of waterlevel fluctuations on resident fish. The fluctuations reduce primaryand secondary production in the reservoirs, hence they have a directimpact on fish production. Annual reports from 1983 through 1988document these effects. Mitigation alternatives for losses from theconstruction and operation of Hungry Horse Dam are described in thefinal report for BPA-funded Project 85-23. The models developedduring the project have been critically reviewed by researchers atthe University of Washington.Recommendations for further action will be submitted to the Councilafter completion of the studies. Biological models will be runconcurrently with the System Analysis Model to help guiderecommendations.2 0 5