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Mill Creek (pictured) is one of the main headwaters tributaries of the Santa Ana River. The Santa Ana River rises in the southern San Bernardino Mountains, at the confluence of two tiny streams, Heart Bar Creek and Coon Creek, at an elevation of 6,991 feet (2,131 m).
Mill Creek is a 17.8-mile-long (28.6 km) [3] stream, originating in the San Bernardino Mountains, in San Bernardino County, California.It is a major tributary of the Santa Ana River.
Its primary purpose is flood control and it is the downstream element of the Santa Ana River's flood control system, which is a natural constriction about 30.5 mi (49.1 km) upstream from the ocean. The area upstream from the dam contains 2,255 sq mi (5,840 km 2 ) of the watershed's 2,650 sq mi (6,900 km 2 ).
Highway 91, which follows the Santa Ana River through a pass between the Santa Ana Mountains on the south and the Chino Hills on the north, is one of California's most congested routes. Because of this, several proposals have been floated to excavate a highway tunnel through the Santa Ana Mountains, although the multibillion-dollar idea has ...
San Jacinto River. Cottonwood Canyon Creek [37] in Railroad Canyon; Canyon Lake in Railroad Canyon Salt Creek [38] [39] Perris Valley Channel [40] Bautista Creek [41] Indian Creek [42] North Fork San Jacinto River [43] Logan Creek [44] Stone Creek [45] Black Mountain Creek [46] Fuller Mill Creek [47] South Fork San Jacinto River [48] Dry Creek ...
• elevation. 2,605 ft (794 m) ... Bear Creek is an approximately 17-mile (27 km) tributary of the Santa Ana River in the San Bernardino Mountains of the U.S. state ...
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.
Native Americans have inhabited the Santiago Creek and Santa Ana River watershed for up to 12,000 years. The creek was named by the Spanish Gaspar de Portolá expedition of 1769, which crossed the Santa Ana River near where it meets the Santiago Creek. [3] In the 1870s there was a short-lived silver boom along the tributary Silverado Creek.