Hetch Hetchy Reservoir is a striking Sierra Nevada lake in California, renowned for its granite canyon walls, cascading waterfalls, and uncrowded backcountry trails.
Hetch Hetchy Reservoir occupies a valley that John Muir once called the twin of Yosemite Valley, praising its polished granite domes, hanging meadows, and ribbon waterfalls. The valley was flooded in 1923 after a long political battle, when O'Shaughnessy Dam was completed to serve the water needs of San Francisco. That history lends the place a bittersweet quality that thoughtful visitors often feel as they walk across the dam and look out over the water.
The main trail follows the northern shore of the reservoir through oak woodland and chaparral before reaching Wapama Falls, one of the most powerful waterfalls accessible by a relatively short hike in the park. Spring floods sometimes close the footbridges at the falls, so check conditions ahead of time.
Swimmers and boats are prohibited on the reservoir, keeping it pristine. Birding is excellent along the shoreline, and black bears, mule deer, and peregrine falcons are regularly spotted. Guided hikes through guided hikes programs in the broader park can add context to the geology and conservation history of this remarkable place.
Few corners of California offer this combination of dramatic scenery, genuine solitude, and ecological significance, making Hetch Hetchy Reservoir a destination that rewards the extra miles it takes to reach it.
Visit in late April or May when snowmelt feeds Wapama Falls and Tueeulala Falls at their most dramatic, sending cascades straight into the reservoir.
Arrive early on weekends, as the O'Shaughnessy Dam parking area fills quickly during spring and summer.
Bring plenty of water and sun protection, since the canyon trails receive intense midday heat and shade is limited along the shoreline path.
Pack a picnic and pause on the dam itself for a panoramic view of the reservoir and the surrounding granite peaks before heading onto the trail.
Check the National Park Service website for current road conditions before your visit, as Evergreen Road and Hetch Hetchy Road can close due to snow or fire activity.
See Yosemite’s waterfalls on an accessible, all-ages tour
Hike to Wapama Falls through Hetch Hetchy Valley in Yosemite National Park
Choose a seasonal Yosemite summit hike with a local guide