The system is named for the former Hetch Hetchy Valley, which is now underwater in Hetch Hetchy Reservoir, held back by the O’Shaughnessy Dam that impounds the Tuolumne River inside Yosemite ...

The compelling story of how San Francisco secured its fabled water supply, the Hetch Hetchy reservoir in Yosemite National Park. Water from the Wilderness: Hetch Hetchy to San Francisco Bay is ...

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A bit off the typical Yosemite road trip itinerary, a trip to the Hetch Hetchy Valley in the northwest corner of the park surrounds visitors in solitude. One if its signature features is Wapama ...