Approximate location — plotted from published sources, not a site visit, and not a guarantee of access.
Obsidian Flat Group Campground sits at about 7,800 feet in Inyo National Forest north of Mammoth Lakes, named for a nearby obsidian lava flow. The surrounding Deadman Creek and Obsidian Dome country is volcanic rhyolite and glass used by visitors studying local geology. Deadman Road leaves US-395 to reach the site.