West Fork San Gabriel River
General data
- Name: West Fork San Gabriel River
- Water system: San Gabriel River (California)
- Water type: River
- Progression: San Gabriel River (California) -> Pacific Ocean -> Planet Earth
- Climates: Temperate
- Continents: North America
- Countries: United States of America
The West Fork of the San Gabriel River, 19 miles (31 km) long, originates at Red Box Saddle, a visitor center and frequently used trailhead along the Angeles Crest Highway and about 2 miles (3.2 km) northwest of the summit of Mount Wilson. Beginning at an elevation of 4,666 feet (1,422 m), the West Fork flows at a much lower elevation than the East Fork and is the smaller of the two rivers in terms of water volume. The West Fork flows east in a fairly straight course for its entire length. From its headwater, the river quickly descends to the Cogswell Reservoir, where Devils Canyon Creek joins from the north. The Gabrielino Trail parallels the river from Red Box Saddle as far as the Devore campground, above Cogswell Reservoir.