O'Shaughnessy Dam Viewpoint

Overview

The trailhead for the O'Shaughnessy Dam Viewpoint trail is located at the bottom of the parking lot before you reach the dam. A gate blocks the road from traffic, but it is open to hikers and fishermen. After ducking under the gate, the trail descends steadily as it runs parallel to the the Tuolumne River, which runs below the trail on the right hand side. Wildflowers can be seen along the right side of the trail in the spring. The trail is a doubletrack gravel road, which makes for easy hiking. Around .4 miles, the trail cuts back to the right and makes its way to the river. At .5 mile, a road to the dam breaks off to the right. Even though there are no signs, park rangers and dam workers will ask you to turn back to prevent you from getting too close to the dam. <br><br>The trail continues straight ahead and is relatively exposed, so make sure to wear sunscreen and a hat. At roughly 3/4 of a mile, a wooden bridge crosses the Tuolumne River, offering great views of the river as it makes its way downstream. In the spring, the water moves swiftly while later in the summer, it meanders at a more relaxed pace. Curving around a small hill, the trail passes a tunnel goes into the hillside. This tunnel is part of the dam infrastructure and provides relief if the water levels are too high. After passing through a turnaround, the trail narrows to a singletrack dirt trail that leads out to a rock bench that provides sweeping views of the dam, surrounding hills, and the Tuolumne River as it makes its way downstream. The best views of the dam are along the rock bench. Wildflowers bloom in the fields in the spring, and fisherman can continue down to the river for great fishing. Once you have taken in the views, you return to your car via the trail you descended.<br><br>Due to the fact the trail is not marked at the trailhead, doesn't show up on any park maps, and is not listed in any of the park materials, you'll probably be the only person on the trail. You might run into a park ranger or dam worker in a vehicle, but tha

Trail Stats

Photos

There is a tunnel, which ties into the dam and provides relief in high water, that sits off on the right side of the trail.

There is a tunnel, which ties into the dam and provides relief in high water, that sits off on the right side of the trail.

The trail goes straight as a road breaks off to the right and leads to the dam, which is off limit to civilians.

The trail goes straight as a road breaks off to the right and leads to the dam, which is off limit to civilians.

The trail as it descends from the gate by the dam.

The trail as it descends from the gate by the dam.

The trail becomes a two gravel tire tracks after the bridge.

The trail becomes a two gravel tire tracks after the bridge.

Wildflowers bloom along the trail.

Wildflowers bloom along the trail.

Wooden bridge that crosses the Tuolumne River.

Wooden bridge that crosses the Tuolumne River.

Looking down into the river valley below the dam.

Looking down into the river valley below the dam.

The trail as it enters an open field. Flowers bloom in the spring, and dam workers and rangers can be find resting here.

The trail as it enters an open field. Flowers bloom in the spring, and dam workers and rangers can be find resting here.

During a water release in the spring, the Tuolumne River roars downstream.

During a water release in the spring, the Tuolumne River roars downstream.

A view of the Tuolumne River as it makes its way below the dam in the spring as water was being released.

A view of the Tuolumne River as it makes its way below the dam in the spring as water was being released.

The Hetch Hetchy Reservoir from the start of the trail.

The Hetch Hetchy Reservoir from the start of the trail.

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