Калифорниядағы Фезер өзені

the river in California

The Feather River is the principal tributary of the Sacramento River, in the Sacramento Valley of Northern California. The river's main stem is about 73 mile (117 km) long. The Feather River and its forks were a center of gold mining during the 19th century. Since the 1960s, the river has provided water to central and southern California, as the main source of water for the California State Water Project. Its water is also used for hydroelectricity generation. The average annual flow of the Feather River is more than 7 million acre feet (3.3 km3). The Feather is unique in that two of its tributaries, the East Branch and Middle Fork, originate east of the Sierra Nevada in the Diamond Mountains and breach the crest of the Sierra as they flow west.

The river rises in four main forks in the Sierra Nevada which unite as arms of the Lake Oroville reservoir in the foothills 5 mile (8 km) northeast of Oroville in eastern Butte County. In terms of drainage areas the largest is the North Fork, which drains about 60% of the entire upper Feather River watershed. The Middle Fork is the second largest, draining about 32% of the upper basin. The South Fork and the West Branch are much smaller, each drains less than 5% of the upper basin.

The North Fork Feather River begins in Feather River Meadows at the junction of Rice Creek and South Arm Rice Creek, The names and confluence locations of the streams in this area were changed by the Board on Geographic Names in 1927. USGS topographic maps, as of 1995, are mislabeled for South Arm, North Arm Rice Creek, Rice Creek and North Fork Feather River. Rice Creek, labeled North Arm Rice Creek on USGS topo maps, flows south from its source at Cold Boiling Lake, , in Lassen Volcanic National Park, through Crumbaugh Lake, and south to join the South Arm Rice Creek, forming the North Fork Feather River.

The East Branch is one of the major tributaries of the Feather River system. It originates at , at the confluence of Indian Creek and Spanish Creek. Indian Creek is another long and important tributary, flowing from its source at , on the south slopes of Diamond Mountain, south and west, through Indian Valley and north of American Valley. Impounded at Antelope Dam, Indian Creek then joins Spanish Creek to form the East Branch North Fork Feather River. The longest tributary of Indian Creek is Last Chance Creek, which rises in eastern Plumas County at , south of Honey Lake, and flows generally west, joining Indian Creek at the western end of Genesee Valley. From its source at the Indian and Spanish Creeks confluence, the East Branch North Fork flows west past Twain and joins the North Fork near Belden. The East Branch's main stem length is about 18 mile (29 km). Indian Creek is about 52.5 mile (84 km) long, and Last Chance Creek is about 45 mile (72 km) long. The East Branch's most distant headwater is Last Chance Creek's source. The total length from the mouth of the East Branch to the source of Last Chance Creek is about 89 mile (143 km). It is formed by the joining of a number of tributaries that merge in an inverted river delta wetland with a complex network of irrigation ditches and drains called the Sierra Valley Channels. A number of creeks merge in the Sierra Valley, the longest of which is Little Last Chance Creek, which originates at and flows south through Frenchman Lake and Last Chance Valley to the Sierra Valley, where it divides into two distributary channels. Other tributaries that join to form the Middle Fork in the Sierra Valley include Carman Creek, Fletcher Creek, Turner Creek, Berry Creek, Hamlin Creek, Sierraville Creek, and Smithneck Creek. It heads on the southwest slope of Pilot Peak, just north of Gibsonville Ridge and Bunker Hill Ridge. It flows west and southwest to Little Grass Valley Reservoir, an impoundment created by Little Grass Valley Dam. Below the dam the South Fork flows southwest between Mooreville Ridge and Lumpkin Ridge and enters Butte County. Just before entering Lake Oroville the Ponderosa Diversion Dam impounds the South Fork in the Ponderosa Reservoir. Below the dam the river becomes the south arm of Lake Oroville.

The 46.4 mile (75 km) Another diversion dam on the West Branch Feather River near Magalia, called the Magalia 73 Dam, conveys water into the Upper Miocene Canal, which runs to Kunkle Reservoir and the Lime Saddle Powerhouse on Lake Oroville. From the powerhouse water is carried by the Middle Miocene Canal to the Coal Canyon Powerhouse and on into the Oroville Thermalito Complex. The Miocene Canal and Lime Saddle Powerhouse are part of the DeSabla Regional Bundle of hydroelectric facilities operated by the Pacific Gas and Electric Company. The West Branch Feather River flows by Stirling City and is joined by Big Kimshew Creek and the Little West Fork West Branch Feather River. Concow Creek, flowing southwest from Concow Reservoir, joins just before the West Branch empties into the northwest arm of Oroville Lake, near Paradise. is located where a number of tributaries come together to form the Middle Fork. The valley's elevation is nearly 5000 feet (1524 m). It is known as the largest high alpine valley in the continental United States. It also lies along the Pacific Flyway, making it an important seasonal home to migrating birds. Settlements in the valley include Loyalton, Sierraville, and Beckwourth, with Portola just west of Sierra Valley. The 1849 California Gold Rush brought a flood of prospectors and settlers to the region. The American and Indian Valleys were settled in the 1850s. In the Sierra Valley the first settlers arrived in 1852.

The riparian area of the Feather River supports a rich biodiversity of native flora and fauna. The Sierra Nevada reaches have considerable wild river features and steep gradients. In lower reaches, after joining of the forks, there is also significant habitat; near Yuba City, for example, there are extents of the river with numerous valley oak trees with understory of wild grape. The Feather River stonecrop (Sedum albomarginatum) is a rare plant endemic to the Feather River watershed. The California Office of Environmental Health Hazard Assessment (OEHHA) has developed a safe eating advisory for the upper and lower sections of Feather River based on levels of mercury found in fish caught from this water body.