O'Shaughnessy Dam
Building in Groveland
historic site
Completed in the 1920s, O'Shaughnessy Dam serves as the historic starting point for the Hetch Hetchy hike, offering visitors expansive views across the reservoir. The experience is uniquely characterized by a trail that crosses the dam itself before leading hikers through a scenic mountain tunnel.
Visitors highly value the O'Shaughnessy Dam area for its stunning natural beauty and offer helpful advice on navigating trails and wildlife. However, there is a growing consensus that the location is becoming increasingly crowded, detracting from its reputation as a peaceful retreat.
- Begin your Hetch Hetchy hike by walking directly across the dam
- Prepare for a unique walk through a scenic mountain tunnel
- Arrive early in the day to avoid peak crowd times
- Stay alert for wildlife and follow local navigation advice
- Bring a camera for expansive views across the reservoir
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