Hetch Hetchy
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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 National Park and is drained by the
Hetch Hetchy Valley
Hetch Hetchy Valley 1
Tueeulala Falls, 840 ft (260 m), is located on the north side of the valley.
Albert Bierstadt, The Hetch Hetchy Valley, California, late 19th century
O'Shaughnessy Dam is a 430-foot-high 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 Het
Hetch Hetchy
…damming Hetch Hetchy became mired in the political issues of the day. The law authorizing the dam passed Congress on December 7, 1913. In 1923, the O'Shaughnessy Dam was completed on the Tuolumne River, flooding the entire valley under the Hetch Hetchy Reservoir. The dam and reservoir are the centerpiece of the Hetch…
O'Shaughnessy Dam
The site of O'Shaughnessy Dam before construction began, c. 1914
Construction work on the dam in August 1922
The dam as initially completed in May 1923