The East Fork of the San Gabriel River is a tributary located in the San Gabriel Mountains of Southern California. It flows through the Angeles National Forest and is known for its scenic beauty, featuring clear waters and rugged terrain. The river is a popular destination for outdoor activities such as hiking, fishing, and picnicking. This river is part of the larger San Gabriel River system, which ultimately flows into the Pacific Ocean. The East Fork is also significant for its historical context, as it was once a site for gold mining during the California Gold Rush. Today, it remains a vital natural resource and recreational area.