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San Juan Creek, also called the San Juan River, [1] is a 29-mile (47 km) long stream in Orange and Riverside Counties, draining a watershed of 133.9 square miles (347 km 2). [ 4 ] [ 5 ] Its mainstem begins in the southern Santa Ana Mountains in the Cleveland National Forest .
Map of San Juan Creek watershed. San Juan Creek is a creek in Orange County in the U.S. state of California. It is about 29 miles (47 km) long, and along with its major tributary, Trabuco Creek, drains 133 square miles (340 km 2) near the southernmost extent of Orange County. This article describes the course of San Juan Creek.
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.
Located in an arid coastal basin in southern Orange County, the creek's watershed comprises 40.3% of the 133.9-square-mile (347 km 2) San Juan Creek watershed. It makes a wide bend from northeast to southwest, bounded by the Santa Ana Mountains to the north, the foothills of the Santa Anas to the west, and a drainage divide within the San Juan ...
Oso Creek is an approximately 13.5-mile (21.7 km) tributary of Arroyo Trabuco in southern Orange County in the U.S. state of California. [1] Draining about 20 square miles (52 km 2) in a region north of the San Joaquin Hills and south of the Santa Ana Mountains, the creek is Trabuco Creek's largest tributary, and is part of the San Juan Creek drainage basin.
As of 2001, the average annual precipitation in the San Juan Hydrological Unit, which Aliso Creek is part of, was 16.42 inches (417 mm). [25] The watershed borders five major Orange County watersheds: Santiago Creek to the north, San Diego Creek to the west, Laguna Canyon to the southwest, Salt Creek to the southeast, and San Juan Creek to the ...
A map of the Los Angeles Basin's oil and gas fields Los Angeles City Oil Field in 1905. Accumulations of oil and gas occur almost wholly within strata of the younger sequence and in areas that are within or adjacent to the coastal belt. [1] The Puente formation has proved to be the most notable reservoir for petroleum in the basin. [21]
The San Gabriel River (right of the I-605 here) changes from dirt to concrete channel in Downey, near the Rio San Gabriel Park (right center) The San Gabriel River basin drains a total of 689 square miles (1,780 km 2) [3] and is located between the watersheds of the Los Angeles River to the west, the Santa Ana River to the east, and the Mojave Desert to the north.