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Hetch Hetchy is a valley, reservoir, ... Before damming, the high granite formations produced a valley with an average depth of 1,800 ft (550 m) ...
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]
John Muir proposed that Yosemite Valley and Hetch Hetchy Valley were formed purely by glacial action. In 1930, François E. Matthes proposed a hybrid hypothesis, where most of the depth of the valley was gouged by water erosion, the rest by glacial action. The glacial action also claimed to have widened the valley.
Eleven reservoirs have a storage capacity greater than or equal to 1,000,000 acre-feet (1.2 km 3); all of these except one are in or on drainages that feed into the Central Valley. 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 ).
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 Hetch Hetchy Valley was sculpted by glaciers as recently as 10,000 years ago (like nearby Yosemite Valley). It has an elevation of 3,800 feet (1,200 m) above sea level and is 3 miles (5 km) long in an east to west orientation. [1] The Hetch Hetchy Valley is in the northwest corner of Yosemite National Park, which was established in 1890.
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The Hetch Hetchy to Lake Vernon Trail in Yosemite starts from the parking lot close to the O'Shaughnessy Dam at the Hetch Hetchy Reservoir, and goes to Lake Vernon through the Yosemite Wilderness. Staying overnight requires a wilderness permit which can be obtained at the Hetch Hetchy ranger station or reserved online.