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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 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.
As completed, O'Shaughnessy Dam is 910 feet (280 m) long, spanning the valley at its narrow outlet. [2] The dam contains 675,000 cu yd (516,000 m 3 ) of concrete. The Hetch Hetchy Reservoir created by the dam has a capacity of 360,400 acre⋅ft (0.4445 km 3 ), with a maximum area of 1,972 acres (798 ha) and a maximum depth of 306 feet (93 m). [ 2 ]
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Even if you have reservations, all but one Yosemite campground remains closed. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 more ...
Those reservations will be available on a first-come, first-served basis on www.recreation.gov beginning Monday at 8 a.m. The dates that can be reserved are Feb. 8-9, 15-17 and 22-23.
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