Оуэнс алқабы: Калифорнияның шөлейт аймағы

Valley in California, United States

Owens Valley (Mono: Payahǖǖnadǖ, meaning "place of flowing water") is an arid valley of the Owens River in eastern California in the United States. It is located to the east of the Sierra Nevada, west of the White Mountains and Inyo Mountains, and is split between the Great Basin Desert and the Mojave Desert. The mountain peaks on the West side (including Mount Whitney) reach above 14000 feet (4267 m) in elevation, while the floor of the Owens Valley is about 4000 feet (1219 m), making the valley the deepest in the United States. The Sierra Nevada casts the valley in a rain shadow, which makes Owens Valley "the Land of Little Rain". The bed of Owens Lake, now a predominantly dry endorheic alkali flat, sits on the southern end of the valley. The current arid nature of the valley is mostly due to the Los Angeles Department of Water and Power diverting the water of the region. The valley provides water to the Los Angeles Aqueduct, the source of one third of the water for city, and was the area at the center of one of the fiercest and longest running episodes of the California Water Wars. Owens Lake was completely emptied by 1926, only 13 years after Los Angeles began diverting water. The water diversions inspired aspects of the 1974 film Chinatown. Towns in the Owens Valley include Bishop, Lone Pine, Independence and Big Pine; about 25,000 people live in the valley. The major road in the Owens Valley is U. S. Route 395.

About three million years ago, the Sierra Nevada Fault and the White Mountains Fault systems became active with repeated episodes of slip earthquakes gradually producing the impressive relief of the eastern Sierra Nevada and White Mountain escarpments that bound the northern Owens Valley Mono Basin region. Owens Valley is a graben—a down dropped block of land between two vertical faults—the westernmost in the Basin and Range Province. It is also part of a trough which extends from Oregon to Death Valley called the Walker Lane. The western flank of much of the valley has large moraines coming off the Sierra Nevada. These unsorted piles of rock, boulders, and dust were pushed to where they are by glaciers during the last ice age. An excellent example of a moraine is on State Route 168 as it climbs into Buttermilk Country. spiny hopsage, antelope bitterbrush, saltbush, ephedra, and several perennial grasses including desert needlegrass. Along the Owens River, some restoration of cottonwoods, willows, and wetlands has occurred. The eastern slopes of the valley lie in the "Tonopah Sagebrush Foothills" ecoregion. On May 1, 1834, Joseph R. Walker entered Owens Valley from the south, having crossed the Sierra Nevada at Walker Pass. Walker and his group of 52 men traveled up the valley on their way back to the Humboldt Sink, and back up the Humboldt River to the Rocky Mountains. In 1845, John C. Fremont named the Owens valley, river, and lake for Richard Owens, one of his guides. Camp Independence was established on Oak Creek near modern Independence, California, on July 4, 1862, during the Owens Valley Indian War. From 1942 to 1945, during World War II, the first Japanese American Internment camp operated in the valley at Manzanar near Independence, California.

In the early 20th century, the valley became the scene of a struggle between local residents and the city of Los Angeles over water rights. William Mulholland, superintendent of the Los Angeles Department of Water and Power (LADWP), planned the 223 mile (359 km) Los Angeles Aqueduct, completed in 1913, which diverted water from the Owens River. The water rights were acquired deceitfully, often splitting water cooperatives and pitting neighbors against one another. In 1924, local farmers were fed up with the purchases and erupted in violence, sabotaging parts of the water system. Farmers who resisted the pressure from Los Angeles until 1930 received the highest price for their land; most farmers sold their land from 1905 to 1925, and received less than Los Angeles was willing to pay. As a result of these acquisitions, the lake subsequently dried up completely, leaving the present alkali flat which plagues the southern valley with alkali dust storms. In 1970, LADWP completed a second aqueduct from Owens Valley. More surface water was diverted, and groundwater was pumped to feed the aqueduct. Owens Valley springs and seeps dried and disappeared, and groundwater dependent vegetation began to die. LADWP missed this deadline and was sued again. Under another settlement, this time including the State of California, Los Angeles promised to rewater the lower Owens River by September 2005. In July 2004, Los Angeles mayor James Hahn proposed barring all future development on its Owens Valley holdings by proposing a conservation easement for all LADWP land. They did not meet this extended deadline. In 2008, Los Angeles fulfilled its promise and rewatered the lower Owens River. Pursuant to a 2014 agreement between the city and Great Basin Unified Air Pollution Control District (GBUAPCD, the Owens Valley air quality regulators), LADWP began using a new method of suppressing airborne dust from the dry bed of Owens Lake. In 2022, the GBUAPCD issued an order and subsequently fined the Los Angeles utility for ignoring an order to control dust on a 5 acre patch of dry lake bed. The LADWP responded with a lawsuit, accusing the air district of exceeding its authority and ordering dust control measures without first conducting an environmental analysis of its impacts, as required by the California Environmental Quality Act. A California Superior Court ruled that the 2014 agreement doesn't cover the dispute and the fines levied by GBUAPCD are unenforceable.

The Owens Valley Radio Observatory located near Westgard Pass is one of ten dishes making up the Very Long Baseline Array (VLBA).