Overview
The Columns of the Giants site along the Middle Fork of the Stanislaus River is one of the most visually dramatic geological features in Stanislaus National Forest and one of the least advertised. The formation consists of hexagonal basalt prisms several feet in diameter and up to 30 feet tall, created when a thick lava flow cooled slowly and contracted into geometric columns. The same process created Devils Postpile National Monument 50 miles to the south, and created the Giant's Causeway in Northern Ireland. The Stanislaus version gets a small fraction of those sites' visitors despite being comparable in geological quality.
The interpretive loop trail is 0.5 miles and essentially flat, winding through the column formation with signs explaining the geology and natural history of the site. The columns themselves are embedded in a hillside above the river, tilted from their original vertical orientation by subsequent geological activity. Some have fallen and lie horizontally, exposing the hexagonal cross-section clearly.
This site works well as a stop on a drive through the Highway 108 corridor rather than a destination in its own right, though the river access for a picnic or a swim in summer adds reason to spend more time. Combine with the nearby Clark Fork campground area and the Kennedy Meadows meadow walk for a full day on the Stanislaus. Before visiting, check current conditions for road status and any fire restrictions in the area.
The Route
The Interpretive Loop (0.5 miles)
From the small parking area, the loop trail leads directly to the column formation via a short descent. The columns are immediately visible on the hillside. The loop circles the base of the formation with interpretive signs at key viewpoints. The trail surface is compacted dirt and gravel. The full circuit takes 20-30 minutes at a comfortable pace.
The river is accessible from the site via a short scramble from the lower portion of the loop. Riverside picnicking is popular in summer. The basalt walls above the river provide a dramatic backdrop for the swimming area.
When to Visit
May through October offers the most comfortable visiting conditions. The site itself is accessible year-round when the road is passable, but snow can close Highway 108 from November through May depending on conditions. Summer is peak season; the site does not get as crowded as major Sierra destinations, and even July weekends typically offer easy parking and quiet trail conditions.
What to Bring
- This is a short interpretive walk. Basic day-trip gear is sufficient.
- Swimwear if swimming in the river in summer.
- Camera for column detail photography.
- Water: the river is nearby but drinking from it requires treatment.
Practical Details
Day use fee applies as of 2026. America the Beautiful Pass covers the fee. Vault restrooms at the site. Dogs allowed on leash. The Leave No Trace guide applies; the column formation itself should not be climbed, as it is a geological feature in an active natural setting.
Veterans and military can access the America the Beautiful Pass at no cost. See the veteran benefits guide for details.
Getting There
From Sonora, drive east on Highway 108 approximately 30 miles to the Columns of the Giants site, which is signed from the highway in the Donnells area along the Middle Fork Stanislaus River. From the Bay Area via Highway 120, connect to Highway 108 at the Yosemite junction and drive north approximately 15 miles. The site is roadside and well-signed.