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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]
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. [4]
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.
Hetch Hetchy Reservoir and spillway. The Hetch Hetchy Valley became the center of the first major environmental controversy in the United States. John Muir, the leader of the Sierra Club, spearheaded a legal battle against the proposed O'Shaughnessy Dam, famously stating – "Dam Hetch Hetchy! As well dam for water-tanks the peoples' cathedrals ...
Location: Yosemite National ... Ritter Range, Sierra Nevada: Hetch Hetchy Dome is a granite dome, ... A topographic map of the area; Some history, of Hetch Hetchy ...
Tueeulala Falls is located on the north side of Hetch Hetchy Valley in Yosemite National Park. At roughly 880 feet it is the smaller of two large waterfalls that spill into Hetch Hetchy Reservoir, the other being Wapama Falls. It is, however, the larger of the two in terms of greatest free-fall distance, as Wapama is split into two falls.
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.