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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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The uppermost dam is the O'Shaughnessy, which impounds the 360,000-acre-foot (440,000,000 m 3) Hetch Hetchy Reservoir, providing water and power to the City of San Francisco. The Hetch Hetchy hydroelectric system diverts large volumes of water into tunnels that feed two hydroelectric plants, the Kirkwood and the Moccasin.
The new "Peaks Hours Plus" pilot program, which carries a $2 reservation fee, is intended to ease traffic and help protect natural resources in the national park.
The new Peak Hours Plus program carried a $2 reservation fee and was intended to ease heavy traffic and full parking lots, especially in popular Yosemite Valley. Firefall is the nexus of that battle.
A list of Yosemite destinations includes hiking trails and things to see: Hiking trails ... O'Shaughnessy Dam; Cascade View; Pothole Dome; Lembert Dome; Vogelsang Pass;
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