page_title: Hetch Hetchy
section_title: External links
hierarchical_section_title: Hetch Hetchy / External links
caption_attribution_description: "Hetch Hetchy Reservoir in Yosemite National Park"
context_page_description: Hetch Hetchy is the name of a valley, a reservoir and a water system in California in the United States. The glacial Hetch Hetchy Valley lies in the northwestern part of Yosemite National Park and is drained by the Tuolumne River. For thousands of years before the arrival of settlers from the United States in the 1850s, the valley was inhabited by Native Americans who practiced subsistence hunting-gathering. During the late 19th century, the valley was renowned for its natural beauty – often compared to that of Yosemite Valley – but also targeted for the development of water supply for irrigation and municipal interests.
  In 1923, the O'Shaughnessy Dam was completed on the Tuolumne River, flooding the entire valley under the Hetch Hetchy Reservoir. The dam and reservoir are the centerpiece of the Hetch Hetchy Project, which in 1934 began to deliver water 167 miles west to San Francisco and its client municipalities in the greater San Francisco Bay Area.
context_section_description: U.S. Geological Survey Geographic Names Information System: Hetch Hetchy
  O'Shaughnessy Dam at Structurae
  Current Conditions, Hetch Hetchy Reservoir, California Department of Water Resources
  San Francisco Public Utilities Commission: Hetch Hetchy Water and Power
  United States Geological Survey
  California Resources Agency Hetch Hetchy Restoration Study
  Bay Area Water Supply and Conservation Agency on Hetch Hetchy dam
caption: Hetch Hetchy Reservoir
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