West Fork Trail Professional Review and Guide
"Once you get past the picnickers and graffiti-covered rocks at the river’s edge, you’ll find a quiet, flat trail that parallels a shaded, unspoiled stretch of the San Gabriel River. Strollers, bicycles, leashed dogs, and runners share the wide path with hikers, but it rarely seems crowded.
Highway 39 is one of the busiest entryways into the 650,000-acre Angeles National Forest. It snakes past the striking San Gabriel Dam and Cogswell Reservoir to the east and continues through to Wrightwood, a popular skiing destination (though passage is often closed due to repairs or rock and mudslide dangers)."