San Gabriel River (California)

San Gabriel River
The channelized San Gabriel River in Los Alamitos, near its confluence with Coyote Creek
Map of the San Gabriel (yellow) and Rio Hondo (purple) watersheds.
Location
Country	United States
State	California
Counties	Los Angeles County, Orange County
Physical characteristics
Source	East Fork San Gabriel River
• location	Angeles National Forest, San Gabriel Mountains
• coordinates	34°20′35″N 117°43′30″W / 34.34306°N 117.72500°W / 34.34306; -117.72500[1]
• elevation	4,493 ft (1,369 m)
Mouth	Pacific Ocean
• location	Alamitos Bay, Long Beach/Seal Beach
• coordinates	33°44′33″N 118°06′56″W / 33.74250°N 118.11556°W / 33.74250; -118.11556[1]
• elevation	0 ft (0 m)
Length	58 mi (93 km)[2]
Basin size	689 sq mi (1,780 km2)[3]
Discharge
• location	above Whittier Narrows Dam[4]
• average	185 cu ft/s (5.2 m3/s)[4]
• minimum	0 cu ft/s (0 m3/s)
• maximum	46,600 cu ft/s (1,320 m3/s)
Basin features
Tributaries
• left	Walnut Creek, San Jose Creek, Coyote Creek
• right	West Fork San Gabriel River

The San Gabriel River is a mostly-urban waterway flowing 58 miles (93 km)^[2] southward through Los Angeles and Orange Counties, California, in the United States. It is the central of three major rivers draining the Greater Los Angeles Area, the others being the Los Angeles River and Santa Ana River. The river's watershed stretches from the rugged San Gabriel Mountains to the heavily-developed San Gabriel Valley and a significant part of the Los Angeles coastal plain, emptying into the Pacific Ocean between the cities of Long Beach and Seal Beach.

The San Gabriel once ran across a vast alluvial flood plain, its channels shifting with winter floods and forming extensive wetlands along its perennial course, a relatively scarce source of fresh water in this arid region. The Tongva and their ancestors inhabited the San Gabriel River basin for thousands of years at villages like Puvunga, relying on the abundant fish and game in riparian habitats. The river is named for the nearby Mission San Gabriel Arcángel, established in 1771 during the Spanish colonization of California. Its water was heavily used for irrigation and ranching by Spanish, Mexican, and American settlers before urbanization began in the early 1900s, eventually transforming much of the watershed into industrial and suburban areas of greater Los Angeles.

Severe floods in 1914, 1934, and 1938 spurred Los Angeles County, and later the federal government, to build a system of dams and debris basins and to channelize much of the lower San Gabriel River with riprap or concrete banks. There is also an extensive system of spreading grounds and other works to capture stormwater runoff and conserve it for urban use. Approximately one-third of the water used in southeast Los Angeles County today comes from the river.

The upper San Gabriel has been intermittently mined for gold since the 1860s, and its deep gravel bed has been an important source of construction aggregate since the early 1900s. The river is also a popular recreation area, with parks and trails in the many flood basins along its course. The headwaters of the San Gabriel River have retained their natural character and are a popular attraction of the Angeles National Forest.