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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).
The city ranges from 2,350 to 2,550 metres (7,710 to 8,370 feet) above sea level. The dominant features of the city's geography are also the source of its name in Spanish: the four rivers of Cuenca (meaning a basin made by a confluence of rivers). These rivers are the Tomebamba (named after the Inca culture), Yanuncay, Tarqui and Machangara, in ...
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 ).
Aerial view of the Santa Ana River and the dam. Seven Oaks Dam is a 2,980-foot (910 m) long arched embankment structure standing 550 feet (170 m) high above the Santa Ana River and 650 feet (200 m) above its deepest foundations. The dam is 40 feet (12 m) wide at the crest and over 2,200 feet (670 m) wide at the base.
The range starts in the north at the Whittier Fault and Santa Ana Canyon, through which the Santa Ana River flows. To the north of the canyon are the smaller Chino Hills in Los Angeles and San Bernardino counties. [1] The northernmost summit of the Santa Anas, at 3,045 feet (928 m), is Sierra Peak.
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 Ana River in the U.S. state of California has over 20 significant tributaries and there are over 50 significant streams in the watershed. List
About 34 miles (55 km) long, it drains most of the northern Santa Ana Mountains and is a tributary to the Santa Ana River. It is one of the longest watercourses entirely within the county. [ 2 ] The creek shares its name with Santiago Peak , at 5,687 ft (1,733 m) the highest point in Orange County, on whose slopes its headwaters rise.