Obsidian Flat Group Campground is a primitive group camping facility at 7,800 feet elevation in the Eastern Sierra, accommodating up to 50 people with one large site adjacent to Deadman Creek.

The campground offers access to exceptional trout fishing in Deadman Creek and nearby Owens River tributaries, plus hiking via Deadman Creek Trail into the Ansel Adams Wilderness; amenities include vault toilets, picnic tables, and bear-proof food lockers, though campers must bring their own water.

Located about 8 miles north of Mammoth Lakes via Highway 395, the site is typically open mid-June through September and requires advance reservations through Recreation. gov.