Twin Falls Mitigation Plan: Long Term Monitoring of Fish Populations

by Allan C. Solonsky, Harza Northwest, Inc, Bellevue, United States,
Phillip J. Hilgert, Harza Northwest, Inc, Bellevue, United States,

Document Type: Proceeding Paper

Part of: Waterpower '91: A New View of Hydro Resources


A fishery monitoring and enhancement plan has been worked out for the Twin Falls Hydroelectric Project which diverts water from a one mile reach of the South Fork Snoqualmie River in Washington State. According to the Twin Falls Mitigation Plan (TFMP). instream flows may be reduced to 75 cfs (2.1 m3/s) during May, June and July if surveys indicate that numbers of trout in areas affected by the project are not significantly lower than pre-project levels Modification of the instream flow regime would take place following two years of post-project monitoring. Pre-project and post-project monitoring is described. Final conclusions have not yet been reached.

Subject Headings: Fish management | Hydro power | Rivers and streams | Water resources | Water management | Surveys (non-geomatic) | Power plants | Basins | Washington | United States

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