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Cutthroat Trends (Draft)

Westslope Cutthroat Trout

Pend OreillePend Orielle LakePriestLower Kootenai (Idaho)Kootenai (Montana)MoyieNorth Fork Flathead RiverSouth Fork Flathead RiverMiddle Fork Flathead River Swan River Stillwater River Flathead Lake Lower Flathead River Upper SpokaneUpper Coeur d'AleneCoeur d'Alene Lake St. Joe LochsaNorth Fork ClearwaterClearwaterMiddle Fork Clearwater South Fork ClearwaterSelwayLower SalmonLittle SalmonMiddle Salmon-ChamberlainMiddle Fork SalmonMiddle Salmon-PantherUpper SalmonSouth Fork SalmonLemhiPahsimeroiBlackfoot RiverBitterrootJohn DayMethowLake ChelanUpper Clark ForkFlint-Rock CreekMiddle Clark ForkLower Clark Fork

Status: Unknown

In the Columbia River Basin, westslope cutthroat trout are distributed throughout subbasins in Montana and Idaho with a few populations also persisting in Oregon and Washington. Westlope cutthroat now occupy only a small percentage of its historic range in Montana and Idaho. Non-native cutthroat trout subspecies and rainbow trout have been stocked in waters inhabited by westslope cutthroat trout throughout the Columbia River Basin. Because westlope cutthroat trout can hybridize with the introduced trout, researchers have estimated that genetically pure westslope cutthroat trout currently inhabit a small percentage of their historic range.

The primary threats to westlope cutthroat trout in the Columbia River Basin include habitat degradation, introductions of non-native species, and Overexploitation.