Instream flows incremental methodology: Kootenai River, Montana. Final Report 1990–2000

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Regulated rivers such as the Kootenai River below Libby Dam often exhibit hydrographs and water fluctuation levels that are atypical when compared to non-regulated rivers. These flow regimes are often different conditions than those which native fish species evolved with and can be important limiting factors in some systems. Fluctuating discharge levels can change the quantity and quality of aquatic habitat for fish. The instream flow incremental methodology (IFIM) is a tool that can help water managers evaluate different discharges in terms of their effects on available habitat for a particular fish species. The U. S. Fish and Wildlife Service developed the IFIM (Bovee 1982) to quantify changes in aquatic habitat with changes in instream flow (Waite and Barnhart 1992; Baldridge and Amos 1981; Gore and Judy 1981; Irvine et al. 1987). IFIM modeling uses hydraulic computer models to relate changes in discharge to changes in the physical parameters such as water depth, current velocity, and substrate particle size, within the aquatic environment. Habitat utilization curves are developed to describe the physical habitat most needed, preferred, or tolerated for a selected species at various life stages (Bovee and Cochnauer 1977; Raleigh et al. 1984). Through the use of physical habitat simulation computer models, hydraulic and physical variables are simulated for differing flows, and the amount of usable habitat is predicted for the selected species and life stages. The Kootenai River IFIM project was first initiated in 1990, with the collection of habitat utilization and physical hydraulic data through 1996. The physical habitat simulation computer modeling was completed from 1996 through 2000 with assistance from Thomas Payne and Associates. This report summarizes the results of these efforts.

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ELECTRONIC FILE - Ecology

Recommended citation ("should be cited as follows"): Hoffman, Greg, Don Skaar, Steve Dalbey, Jay DeShazer, Larry Garrow, Tom Ostrowski, Jim Dunnigan, Brian Marotz, ''Instream Flows Incremental Methodology for Kootenai River'', Project No. 1994-00500, 86 electronic pages, (BPA Report DOE/BP-00006294-2)

(Additional info: Project was carried out by Montana Department of Fish, Wildlife and Parks, with assistance from Thomas Payne and Associates, and was funded by Bonneville Power Administration (BPA), U.S. Department of Energy.)

SWAP (2/19/2016):
Hoffman G, Skaar D, Dalbey S, DeShazer J, Garrow L, Ostrowski T, Dunnigan J, Marotz B. 2002. Instream flows incremental methodology for Kootenai River, Montana. Final Report 1990–2000. Portland (OR): Bonneville Power Administration. 88 p. Report No.: DOE/BP-00006294-2. Project No.: 1994-00500.