Sourdough Creek Trail

From the lot, follow the Diablo Lake Trail connector through the campus to the Sourdough Creek junction; take the branch toward the falls. Early on, benches sit beneath an old Douglas-fir, and a short wooden path reaches a platform over the creek beneath an alder. Farther along, a shelter has a brief optional loop nearby. A pit toilet is tucked on a short side path behind the trees near the shelter.

Past the shelter, bridges and switchbacks climb beside the creek through mossy rock. The trees open enough for views of Diablo Lake and Snowfield Peak on the left. Stone steps mark the approach, then the path gets steep and uneven among large pale creek boulders. The falls sit up and left when you reach the top; take care on that rocky finish.

Purple asters and chipmunks are noted near the falls, and shallow summer pools can hold tadpoles. A fall visit has also been reported for its mushrooms and changing leaves, though those are seasonal sightings, not a guarantee.

The gravel parking lot is at the Environmental Learning Center, off State Route 20 near milepost 127.5; the lot is estimated to hold about 40 cars. The Institute describes hiking trails from campus but its visitor page does not spell out walk-up access for this route, so confirm before making the drive. Dogs are not allowed on the campus trail; service animals are permitted.