Hetch Hetchy
General data
- Name: Hetch Hetchy
- Water system: San Joaquin River
- Water type: Artificial lake
- Progression: Tuolumne River -> San Joaquin River -> Suisun Bay -> Carquinez Strait -> San Pablo Bay -> San Francisco Bay -> Golden Gate strait -> Pacific Ocean -> Planet Earth
- Climates: Temperate
- Continents: North America
- Countries: United States of America
Hetch Hetchy is a valley, reservoir, and 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.