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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]
He also wrote hundreds of magazine and newspaper articles, essays, and books advocating for the preservation of American wilderness, such as preventing Yosemite National Park's Hetch Hetchy Valley from being dammed. Though he died before its founding, Muir is often credited as a major figure in the development of the National Park Service. [66]
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.
The Hetch Hetchy Railroad (HHRR) was a 68-mile (109 km) standard gauge Class III railroad constructed by the City of San Francisco to support the construction and expansion of the O'Shaughnessy Dam across Hetch Hetchy Valley. [1] Based in Groveland, the HHRR operated from 1917 to 1949. It primarily carried construction crews and materials, but ...
A topographic map of the area; Some history, of Hetch Hetchy Valley; One photo This page was last edited on 6 August 2024, at 06:59 (UTC). Text is available ...
Smith Peak, in Yosemite National Park in the United States, overlooks the Hetch Hetchy Reservoir and provides grand vistas of the Hetch Hetchy Valley and surrounding wilderness. It is named for a sheep owner who claimed to own the Hetch Hetchy Valley and used it as a summer pasture.
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.