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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]
[14] [17] At the time, Hetch Hetchy was an isolated, seldom visited subalpine valley, visited intermittently by gold seekers and sheepherders. However, since 1890, Hetch Hetchy Valley and the surrounding lands had been part of Yosemite National Park and thus off-limits to utility development, let alone at the grand scale proposed by the city. [18]
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.
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While Don Pedro Reservoir is not part of the Hetch Hetchy Aqueduct, the project's tunnels cross under the upper end of the reservoir. The reservoir could easily be tied into the Hetch Hetchy Project in the future, and the efforts of the Restore Hetch Hetchy group to drain the reservoir in the Hetch Hetchy Valley depend largely on that possibility.
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.
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.
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.