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The Santa Ana River is the largest river entirely within Southern California in the United States. [4] It rises in the San Bernardino Mountains and flows for most of its length through San Bernardino and Riverside counties, before cutting through the northern Santa Ana Mountains via Santa Ana Canyon and flowing southwest through urban Orange ...
The Sacramento and San Joaquin River systems drain the western slope of the Sierra Nevada and most of the Central Valley, forming the Sacramento–San Joaquin River Delta before emptying into Suisun Bay; together, they are the largest river system in California.
Rivers, streams, and creeks — located in Southern California. For convenience, all rivers in Southern California should be included in this category. This includes all the rivers that can also be found in the subcategories.
The Central Valley watershed, which incorporates the Sacramento River, San Joaquin River and Tulare Lake regions, is the largest in California, draining over a third of the state – 60,000 square miles (160,000 km 2) – and producing nearly half the total runoff.
The San Gabriel River historically supported large populations of native fish, including the largest runs of steelhead in Southern California. [43] Steelhead once migrated over 60 miles (97 km) upriver from the Pacific Ocean to spawn, and it was known as one of the "best steelhead fishing rivers in the state". [ 44 ]
Map showing the main Orange County watersheds and watercourses. This is a list of rivers of Orange County, California, part of the Greater Los Angeles Area in Southern California.The Santa Ana River and San Gabriel River are the largest in Orange County; their extensive watersheds extend into neighboring Los Angeles, Riverside and San Bernardino Counties.
The Santa Clara River (Spanish: Río Santa Clara) is an 83 mi (134 km) long [5] river in Ventura and Los Angeles counties in Southern California.It drains parts of four ranges in the Transverse Ranges System north and northwest of Los Angeles, then flows west onto the Oxnard Plain and into the Santa Barbara Channel of the Pacific Ocean.
The Sacramento River's watershed is the largest entirely in California, covering much of the northern part of the state. The endorheic (closed) Goose Lake drainage basin in southern Oregon, however, has been known to overflow into the Sacramento River system during particularly wet years.