The East Fork is the largest headwater of the San Gabriel River in Los Angeles County, California, United States. It originates at the crest of the San Gabriel Mountains in the Angeles National Forest, at the confluence of the Prairie Fork and Vincent Gulch near Mount Baden-Powell. It then flows south and west for 17 miles to San Gabriel Reservoir, where it joins …
The East Fork is the largest headwater of the San Gabriel River in Los Angeles County, California, United States. It originates at the crest of the San Gabriel Mountains in the Angeles National Forest, at the confluence of the Prairie Fork and Vincent Gulch near Mount Baden-Powell. It then flows south and west for 17 miles to San Gabriel Reservoir, where it joins with the West Fork San Gabriel River. Although the East Fork is colloquially considered a separate river, the U.S. Geological Survey officially lists the East Fork as the upper part of the main stem San Gabriel River, a fact is shown by topographical maps of the area.