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Hetch Hetchy is a valley, reservoir, and water system in California in the United States.The glacial Hetch Hetchy Valley lies in the northwestern part of Yosemite National Park and is drained by the Tuolumne River.
The dam and reservoir are the source for the Hetch Hetchy Aqueduct, which provides water for over two million people in San Francisco and other municipalities of the west Bay Area. The dam is named for engineer Michael O'Shaughnessy, who oversaw its construction. [7] Hetch Hetchy Reservoir watershed (Interactive map)
The current lake was formed in 1918 by damming Eleanor Creek as part of the Hetch Hetchy Reservoir system, [2] constructed to supply water and power to the city of San Francisco. The original smaller, natural lake was also named "Eleanor" [2] after the daughter of Josiah Whitney, leader of the California Geological Survey in the 1860s.
Map of California's interconnected water system, including all eleven reservoirs over 1,000,000 acre-feet (1.2 km 3) as well as selected smaller ones.. This is a list of the largest reservoirs, or man-made lakes, in the U.S. state of California.
The system starts in Hetch Hetchy Valley, inside Yosemite National Park. The system also generates up to 400MW of electrical power, depending on rainfall, most of which is sent to San Francisco via city-owned power lines. [63] After water leaves Hetch Hetchy, it passes through tunnels towards powerhouses. Three pipes then bring the water across ...
The reservoir has a natural catchment area of 25.4 square miles (66 km 2); [2] however, most of its water is imported through the Hetch Hetchy Project pipelines. In order to protect the high-quality Hetch Hetchy water, local flows from Moccasin Creek are captured upstream and routed through a bypass system that discharges downstream of Moccasin ...
The San Francisco Public Utilities Commission (SFPUC), of which Hetch Hetchy Water and Power is a division, provided about 45% of the funds for construction of the 1971 New Don Pedro Dam and so has the right to store 570,000 acre-feet (700,000,000 m 3) of water in the reservoir.
Reservoir Dam River County Owner Completed Type Height of dam [a] Reservoir capacity (ft) (m) (acre ft) (1,000 m 3) ; Almaden Reservoir: Almaden Dam: Alamitos Creek