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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]
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 ]
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.
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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 City of Columbus is spending more than $15 million to restart an aging pair of hydro-electric generators beneath O'Shaughnessy Dam near the Zoo. Flooding problems delay breathing new life into ...
O'Shaughnessy Dam can refer to: O'Shaughnessy Dam (California) , the dam that creates the Hetch Hetchy reservoir in Yosemite National Park O'Shaughnessy Dam (Ohio) , near Columbus
The construction of the O'Shaughnessy Dam (built 1915–1923) flooded the valley, creating the Hetch Hetchy Reservoir. In the late 1980s, in response to an initiative by the Reagan Administration, the national Sierra Club created a group dedicated to restoring Hetch Hetchy Valley in Yosemite National Park called the Hetch Hetchy Restoration ...
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