San Gabriel Canyon
| San Gabriel River | |
| River | |
 The San Gabriel River at Long Beach
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| Country | United States |
|---|---|
| State | California |
| Regions | Los Angeles County, Orange County |
| Tributaries | |
| - left | East Fork, Walnut Creek, Coyote Creek |
| - right | West Fork, Rio Hondo |
| Cities | Azusa, Covina, Baldwin Park, El Monte, Whittier, Pico Rivera, Downey, Norwalk, Bellflower, Cerritos, Lakewood, Cypress, Long Beach, Seal Beach |
| Primary source | North Fork Fish Fork East Fork San Gabriel River |
| - location | Mount San Antonio, San Gabriel Mountains |
| - elevation | 7,500 ft (2,286 m) |
| - coordinates | 34°20′35″N 117°43′30″W / 34.34306°N 117.72500°W |
| Secondary source | West Fork San Gabriel River |
| - location | San Gabriel Peak, San Gabriel Mountains |
| - elevation | 4,800 ft (1,463 m) |
| - coordinates | 34°15′29″N 118°06′13″W / 34.25806°N 118.10361°W |
| Source confluence | San Gabriel Reservoir |
| - location | San Gabriel Mountains |
| - elevation | 1,473 ft (449 m) |
| - coordinates | 34°15′29″N 118°06′13″W / 34.25806°N 118.10361°W |
| Mouth | Pacific Ocean |
| - location | Alamitos Bay |
| - elevation | 0 ft (0 m) |
| - coordinates | 33°44′33″N 118°06′56″W / 33.74250°N 118.11556°WCoordinates: 33°44′33″N 118°06′56″W / 33.74250°N 118.11556°W |
| Length | 60.6 mi (98 km) |
| Basin | 713 sq mi (1,847 km2) |
| Discharge | for above Whittier Narrows Dam |
| - average | 185 cu ft/s (5 m3/s) |
| - max | 46,600 cu ft/s (1,320 m3/s) |
| - min | 0 cu ft/s (0 m3/s) |
 Map of the San Gabriel River watershed.
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Website: lasgrwc2 |
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The San Gabriel River flows 43 miles (69 km) through Los Angeles and Orange Counties, California in the United States. Measured to its highest headwaters in the Angeles National Forest, along the Prairie Fork in the San Gabriel Mountains, the river is 60.6 miles (97.5 km) long, draining a watershed of 713 square miles (1,850 km2). The San Gabriel River basin includes the rugged southern slopes of the San Gabriel Mountains, the urbanized San Gabriel Valley and the similarly developed coastal plain of the Los Angeles Basin.
The river derives its name from the Spanish Mission San Gabriel Arcángel founded in 1771, now in the present day city of San Gabriel. Until the mid-20th century, the river was free flowing with natural banks and a riparian zone habitat lined with forests, marshes, and grasslands for much of its length and a large estuary at its mouth. Today most of the San Gabriel River is channelized, with the section below Whittier Narrows Dam lined by concrete, and impounded in places by debris and flood control dams.
The East, West and North Forks of the San Gabriel River, rising in the San Gabriel Mountains inside the Angeles National Forest, form the source headwaters of the river. The East Fork, sometimes considered part of the main stem, rises in the shadow of Mount San Antonio has two smaller forks of its own, the Prairie Fork and the Fish Fork. The East Fork officially begins at the confluence of the Prairie Fork and a smaller tributary, Vincent Gulch. The Fish Fork and the East Fork combine at the base of Iron Mountain in a canyon nearly 5,000 feet (1,500 m) deep. From there, the East Fork flows south then turns west, flowing into the east arm of San Gabriel Reservoir. The similarly sized West Fork starts near San Gabriel Peak near the Angeles Crest Highway and flows east before being impounded in Cogswell Reservoir, where it receives Devils Canyon Creek. The river continues to flow east and receives Bear Creek from the left before combining with the North Fork, which rises near Mount Islip.
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Wikipedia