It rises in northern Gunnison County, in the Elk Mountains on the north side of Schofield Pass, and flows northwest past Marble, then north into Pitkin County past Redstone.
It rises in northern Gunnison County. This is in the Elk Mountains on the north side of Schofield Pass. This is then north. It flows northwest past Marble into Pitkin County past Redstone. This is then north.