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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.
That October, with construction of the dam underway, San Francisco's city engineer, Michael O'Shaughnessy, wrote negatively of Mulholland in a letter to John R. Freeman, an engineer who had assisted the city in its pursuit of permission to construct the Hetch Hetchy reservoir and water system in Yosemite National Park.
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]
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.
The reservoir is situated in a glacier carved valley at an elevation of 4,600–4,700 feet (1,400–1,400 m). Prior to flooding, a smaller lake of approximately 1.5 by 0.5 miles (2.41 km × 0.80 km) and 200 feet (61 m) deep existed in the valley. The lake was fed by three streams, Kibbie Creek, Eleanor Creek, and Frog Creek.
In 1905, when the city of San Francisco lobbied Congress to allow it to dam the Hetch Hetchy Valley to provide the growing city with water, Muir and Colby were leaders of the campaign to prevent the damming of the Tuolumne River and the flooding of the valley. Colby called the valley "the indispensable entrance and exit to the Grand Canyon of ...
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 ...