From 1972 to 1975, an estimated 39–47% of the adult rainbow trout (Salmo gairdneri) in Sagehen Creek spawned in an intermittent stream—Kiln Meadow Tributary—while several permanently flowing tributaries attracted only 10–15% of the run. The balance of the fish presumably spawn in the upper reaches of the main stream. Kiln Meadow Tributary drains a south-facing slope, and peak runoff from snow melt occurs early. This may be one factor that attracts spawning fish. The absence of competition from brook trout, which cannot spawn in Kiln Meadow Tributary in the fall, may enhance the value of this watercourse for rearing young rainbow trout.