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The Hetch Hetchy Valley began as a V-shaped river canyon cut out by the ancestral Tuolumne River. About one million years ago, the extensive Sherwin glaciation widened, deepened and straightened river valleys along the western slope of the Sierra Nevada, including Hetch Hetchy, Yosemite Valley, and Kings Canyon farther to the south. [12]
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]
Construction of the dam was finished in 1923. Hetch Hetchy Valley before the Raker Act. There have been ongoing allegations that the Act is being breached by private profits being made; and there have also been several campaigns aimed at removing the dam and restoring the valley.
Lake Eleanor Dam (National ID # CA00121) stands as a concrete multiple arch dam with a height of 68 feet (21 m) and a length of 1,260 feet (380 m). This first stage of the Hetch Hetchy project was built for year-round hydroelectric power generation, which was then sold to help finance construction of the larger O'Shaughnessy Dam, completed in 1923.
The Hetch Hetchy Valley is in the northwest corner of Yosemite National Park, which was established in 1890. Even before the establishment of Yosemite National Park, the city of San Francisco began considering the Tuolumne River and Hetch Hetchy Valley as a possible location for a reliable water source. This sparked a social and political ...
The mouth of Falls Creek on Hetch Hetchy Valley before flooding. Falls Creek begins at Dorothy Lake, which is located at one of the northernmost points in the national park. The headwaters, at nearly 10,000 feet (3,000 m) in elevation, lie between Forsyth Peak, Dorothy Lake Pass, Bond Pass and Bigelow Peak.
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.
Moccasin Dam is a small dam on Moccasin Creek in Tuolumne County, California, in the town of Moccasin, west of Yosemite.It holds the Moccasin Reservoir.The dam, reservoir and associated hydroelectric power plant are part of the Hetch Hetchy Project, which provide water and power to the city of San Francisco.