Yosemite National Park

Yosemite National Park

Hetch Hetchy Reservoir

Latitude, Longitude: 37.953551, -119.775170

The Hetch Hetchy reservoir furnishes the water supply for San Francisco. In Yosemite National Park, in Hetch Hetchy Valley and western end of Grand Canyon of the Tuloumne River, formed by damming the Tuolumne River at mile marker 117.5 at O'Shaughnessy Dam.