Johnson Creek, a first order tributary
which enters the Blackfoot River at river mile 3.0, is the only spawning tributary in the
lower 10 miles of river. Johnson Creek supports spawning runs of westslope
cutthroat and low densities of bull trout; these species migrate during spring and early
summer periods usually during the peak of the hydrograph. In the summer, Johnson
Creek's cold water plume provides thermal refuge for bull trout in the Blackfoot River.
At stream mile 0.2 a road crosses
Johnson Creek over a series of undersized culverts. Flow velocities were recorded in
excess of 10 feet/second in June 1997. These culverts are seasonal fish
passage barriers that inhibit the migrations of spring migrating Blackfoot River fish.
|The culverts were
removed in the winter of
1997 and replaced with a bridge. This
project has restored access to six miles
of important spawning and rearing habitat.