Hetch Hetchy Valley, "Yosemite's twin" in California's Sierra Nevada mountains, now sits hidden under 300 feet of water, as its Tuolumne River was dammed in 1923 to form a reservoir. The Tuolumne River's water can be stored further downstream -- outside Yosemite National Park -- to continue the supply of water to San Francisco, allowing us to reclaim this treasured landscape. Sign the Discover Hetch Hetchy Pledge and join our campaign to restore this natural wonder.

