Federal campground in June Lake, CA.
Obsidian Flat Group Campground, located just outside of Mammoth Lakes, California, provides an opportunity for a group to enjoy a secluded getaway in the eastern Sierra Nevada Mountains. With a peaceful forested setting and mountain views, the campground's location is perfect for relaxing and spending time in nature. The area is popular for exploring the surrounding forest and geology, as well as nearby hiking, bicycling, fishing and off-road vehicle riding options.Between 05/01/2025 and 09/30/2025 this location is staffed. Please call (760) 647-3044 to speak with local staff. From 10/01/2025 to 04/30/2026 this location is unstaffed. Please call (760) 647-3005 for general information.One group camping area can accommodate one group of up to 50 people, and up to five RVs (up to 40 feet in length) or 15 vehicles at a time. The site is fairly primitive and is equipped with a picnic table,…