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Kern River : ウィキペディア英語版
Kern River

The Kern River is a river in the U.S. state of California, approximately long. It drains an area of the southern Sierra Nevada mountains northeast of Bakersfield. Fed by snowmelt near Mount Whitney, the river passes through scenic canyons in the mountains and is a popular destination for whitewater rafting and kayaking. It is the only major river in the Sierra Nevada mountain range that drains in a southerly direction.
The Kern River formerly emptied into now dry Buena Vista Lake and Kern Lake via the Kern River Slough and Kern Lake in turn emptied into Buena Vista Lake via the Connecting Slough at the southern end of the Central Valley. Buena Vista Lake when overflowing, first backed up into Kern Lake and then upon rising higher drained into Tulare Lake via Buena Vista Slough and a changing series of sloughs of the Kern River. The lakes were part of a partially endorheic basin that sometimes overflowed into the San Joaquin River. This basin also included the Kaweah and Tule Rivers as well as southern distributaries of the Kings that all flowed into Tulare Lake.
Since the late 19th century the Kern has been almost entirely diverted for irrigation, recharging aquifers and the California Aqueduct, although some water empties into Lake Webb and Lake Evans, two small lakes in a portion of the former Buena Vista Lakebed. The lakes were created in 1973 for recreational use. The lakes hold combined.〔(Buena Vista Aquatic Recreational Area )〕 Crops are grown in the rest of the former lakebed. In extremely wet years the river will reach the Tulare Lake basin through a series of sloughs and flood channels.
Despite its remote source, nearly all of the river is publicly accessible. The Kern River is particularly popular for wilderness hiking and whitewater rafting. The Upper Kern River is paralleled by trails to within a half-mile of its source (which lies at 13,600 ft). Even with the presence of Lake Isabella, the river is perennial down to the lower Tulare Basin. Its swift flow at low elevation means that the river below the reservoir is an extremely popular location for rafting.
==Course==
The Kern River is the southernmost river in the San Joaquin Valley. It begins in the Sierra Nevada on the eastern side of Tulare County and ends on the west side of Kern County where it is mainly diverted for local water supplies. The main branch of the river (sometimes called the North Fork Kern River) rises from several small lakes west of Mount Whitney in the high Sierra Nevada mountains in northeastern Tulare County, in the northeast corner of Sequoia National Park. It flows south through the mountains, passing through Inyo and Sequoia national forests, and the Golden Trout Wilderness. The Little Kern River joins from the northwest at a site called Forks of the Kern.
At Kernville the river emerges from its narrow canyon into a widening valley where it is impounded in Lake Isabella, a reservoir formed by Isabella Dam. The area was once known as Whiskey Flat, the former location of the town of Kernville. The South Fork Kern River joins in Lake Isabella. Like the North Fork, the South Fork rises in Tulare County and flows mainly south, through Inyo National Forest. After entering Kern County the South Fork curves to the west and flows into Lake Isabella.
Below Isabella Dam the Kern River flows southwest through a spectacular rugged canyon along the south edge of the Greenhorn Mountains, emerging from mountains east of Bakersfield, the largest city on the river. Despite being dammed upstream, this part of the river has remarkably swift flow even in the driest summers. In Bakersfield proper, the river loses most of its remaining flow; much of it is diverted and channelized before reaching the city center. In the Kern's lower course downstream from Bakersfield the river is highly diverted through a series of canals to irrigate the farms of the southern San Joaquin Valley and provide municipal water supplies to the City of Bakersfield and surrounding areas. In this region near Bakersfield the Kern River once spread out into vast wetlands and seasonal lakes.
The Friant-Kern Canal, constructed as part of the Central Valley Project, joins the river about west of downtown Bakersfield.
The Kern River is one of the very few rivers in the Central Valley which does not contribute water to the Central Valley Project (CVP). However, water from the CVP, mainly the Friant-Kern Canal, will be deposited for water storage in the aquifers.
Historically, the river flowed an additional south through a now-dry distributary to Arvin, where it formed the seasonal Kern Lake, which would grow to cover about during wet periods. Water from Kern Lake would then flow west through Buena Vista Slough into Lake Buena Vista, another seasonal lake that reached sizes of about . Another channel of the Kern River flowed from the Bakersfield area southwest directly to Buena Vista Lake. In periods of high runoff, Buena Vista Lake overflowed and joined other wetlands and seasonal lakes in a series of sloughs that drained north into the former Tulare Lake, which would sometimes overflow into the San Joaquin River via Fresno Slough, forming one of the longest river systems in California at .

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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