West Twin Creek is a
basin-fed, third-order stream originating from the slopes of Wisherd Ridge and Sheep
Mountain in the Lolo National Forest. It flows southerly through foothills and a
mixture of Plum Creek Timber Company land and private land to its confluence with the
Blackfoot River at river mile 10.6.
A grade control
structure installed above the Highway 200 culvert crossing failed to include fish passage
design features and is a fish barrier.
included modifying the stream grade control with plunge pools and migration routes to
allow for upstream migrations at all stream flow stages. Fish population samples
were collected in August 1996 at river mile 0.1. A mixed fish population was
comprised of rainbow, brook, brown and westslope cutthroat trout. This mixed species
assemblage may indicate successful migration though the grade control structure.
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