The West Fork of the San Gabriel River is 8 miles above Azusa in the mountains. This trail is a service road that starts from the Highway 39 West Fork bridge and heads 6.5 miles west to a small campground, gaining 450 feet elevation in the process. Just past the campground, the trail rapidly becomes quite steep and eventually reaches the top of the Cogswell Dam. Several trails branch out from that point including the short Devil's Canyon segment and long continuation of this trail ending at Red Box ranger station, just South of Mount Disappointment.
