Dimond O Campground is the closest campground to Yosemite's Big Oak Flat entrance and Hetch Hetchy Reservoir, situated adjacent to the Middle Fork Tuolumne River with direct access for swimming, wading, and fishing.

The 26-site campground offers potable water, picnic tables, fire pits, and vault toilets on paved roads, with both single and double-family sites available May-September; reservations are recommended through Recreation. gov.

Nearby trails include the Carlon Falls Trail, and the campground is ideal for day trips to Yosemite while providing a quieter riverside basecamp.