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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]
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.
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]
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.
It drops 150 feet (46 m) over Rancheria Falls before emptying into Hetch Hetchy Reservoir, adjacent to Tiltill Creek. Prior to the flooding of Hetch Hetchy Valley in 1923 with the construction of O'Shaughnessy Dam, Rancheria and Tiltill Creeks combined before joining the Tuolumne River on the valley floor. [4]
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 ...
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.
Falls Creek, also known as the Falls River, [2] is a tributary of the Tuolumne River in Yosemite National Park, California, United States.The creek begins at the northern boundary of the national park and flows 24 miles (39 km) [1] to empty into the Tuolumne at Hetch Hetchy Reservoir, dropping over two well-known waterfalls.