Tuolumne River

Watershed Code: 
Tuolumne watershed boundary

The Tuolumne River Watershed is located in the central Sierra Nevada. Headwaters originate high in Tuolumne Meadows in Yosemite National Park. The Tuolumne River then flows through Hetch Hetchy Valley, which was flooded behind O’Shaughnessy Dam in 1923. The Tuolumne River provides much of the drinking water used by the city and county of San Francisco via the Hetch Hetchy Aqueduct. The hydropower facility at New Don Pedro Dam is the only FERC licensed project in this watershed.

Basic watershed data

Watershed area (km2) 3,970
Total number of dams 8
Total number of powerhouses 6
Total length of conveyances (km)
Note: conveyance length may include portions that extend beyond the watershed boundary.