For an angler judging whether the fishing is worth the drive, the stocking record is the fishing report. Kokanee Creek is a put-and-take angling fishery, stocked with catchable game fish: 34 recorded releases totalling 3,800,691 fish (Westslope (Yellowstone) Cutthroat Trout, Kokanee, Rainbow Trout, Lake Whitefish), last stocked 1952-01-01.
Stocking appears to have wound down after 1952. Confirm whether it is still topped up or now fishes as a residual, wild population. The chart below shows the full release history.