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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 ...
O'Shaughnessy Dam is a 430-foot-high (131 m) concrete arch-gravity dam in Tuolumne County, California, United States.It impounds the Tuolumne River, forming the Hetch Hetchy Reservoir at the lower end of Hetch Hetchy Valley in Yosemite National Park, about 160 miles (260 km) east of San Francisco. [6]
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.
Less crowded than Yosemite Valley, whose roads have been choked with visitors, Hetch Hetchy Valley is a half-forgotten realm filled with granite walls, tall falls and wildflowers.
The largest single reservoir in California is Shasta Lake, with a full volume of more than 4,552,000 acre-feet (5.615 km 3). ... Hetch Hetchy Reservoir: Tuolumne
Hetch Hetchy Reservoir: O'Shaughnessy Dam: Tuolumne River: Tuolumne: ... Palm Canyon Dam Reservoir: Palm Canyon Dam [10] Riverside: Santa Rosa Band of Cahuilla Indians:
The city diverts about an eighth of the Tuolumne River water just inside Yosemite National Park.
A 2019 study commissioned by Restore Hetch Hetchy argued that draining the reservoir and equipping the valley with a tourism infrastructure comparable to that of Yosemite Valley (which receives around 100 times as many visitors annually compared to Hetch Hetchy's 44,000) could result in a "recreational value" of up to $178 million per year, or ...