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Santa Clara River (California)
The Santa Clara River is long,〔U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. (The National Map ), accessed March 16, 2011〕 and is one of the most dynamic river systems in southern California. The river drains the coastal mountains of the transverse ranges north of Los Angeles by flowing west onto the Oxnard Plain and into the Santa Barbara Channel. The watershed has provided habitat for a wide array of native plants and animals and has historically supplied humans with water, fish, and fertile farmland. The northern portion of the watershed was home to the Tataviam people while the southern portion was occupied by the Chumash people. Much of the Santa Clara River Valley is used for agriculture which has limited the use of structural levees to separate the natural floodplain from the river. Although it is one of the least altered rivers in southern California, some levees exist where the river flows through areas of significant urban development.
==Course==
The Santa Clara River's headwaters take drainage from the northern slopes of the San Gabriel Mountains near the Angeles Forest Highway, inside the western part of the Angeles National Forest. Its largest fork, Aliso Canyon, is about long and forms the primary headstream. These branches combine into the broad wash of the main stem near the town of Acton which flows west through Soledad Canyon, crossing under California State Route 14 near the town of Canyon Country. The Sierra Pelona Mountains on the north provide additional watershed and seasonal tributaries. The river receives Bouquet Creek, Placerita Creek, and San Francisquito Creek within the city of Santa Clarita, though in practice the river remains dry most of the year, except on extreme occasions of heavier than average rainfall. The river then crosses west under Interstate 5 and receives Castaic Creek from the right.
After the Castaic Creek confluence, the river starts to flow primarily southwest through the Santa Clarita Valley. Near the county line between Los Angeles County and Ventura County, the river enters the Santa Clara River Valley flowing past Buckhorn and Fillmore, incorporating additional flow from Piru Creek and Sespe Creek, both from the right, and Santa Paula Creek at the town of Santa Paula, where it passes the large South Mountain Oil Field on the south bank. The Santa Clara River then bends southwest, passing the Saticoy Oil Field on the north bank where South Mountain marks its entrance onto the broad Oxnard Plain. The river ends at the Pacific Ocean after flowing across the north side of this plain made fertile with the silt deposited by the river. A sand bar usually stands across the mouth at the Santa Clara Estuary Natural Preserve that lies within McGrath State Beach in Oxnard and bounded on the north by the city of Ventura.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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