For an angler judging whether the fishing is worth the drive, the stocking record is the fishing report. Johnson Creek is a put-and-take angling fishery, stocked with catchable game fish: 2 recorded releases totalling 30,000 fish (Brook Trout), last stocked 1957-01-01.
Stocking appears to have wound down after 1957. Confirm whether it is still topped up or now fishes as a residual, wild population. The chart below shows the full release history.