About OBSIDIAN FLAT
Overview 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.Recreation The eastern Sierras are known for their exceptional trout fishing. Campers can try their luck in Deadman Creek. The majestic scenery and challenging trails are an obvious draw for hikers, mountain bikers and off-road vehicle enthusiasts. Deadman Creek Trail leads hikers into the spectacular Ansel Adams Wilderness.Facilities 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, vault toilet, campfire ring and bear-proof locker for food storage.Natural Features The campground is named after an obsidian lava flow nearby. It is situated in a pine forest at an elevation of 7,800 feet. Deadman Creek is adjacent to the facility, and several lakes are down the road. Many species of wildlife call the mountains home, such as black bear, mountain lions, mule deer, pine marten, pika and numerous fish and birds. Contact Info 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. Nearby Attractions Hikers can access the scenic Ansel Adams Wilderness via nearby trails, and Yosemite National Park is a great day trip. Ansel Adams Wilderness Yosemite National Park
How to Get There
Heading North From U.S. Highway 395 and State Highway 203 (Mammoth Lakes Junction), travel 8.2 miles north on 395. Turn west onto Deadman Road and follow for 3.2 miles to Upper Deadman Campground. Turn toward the Group Campground turnoff onto FS Road 2S05F. Continue one mile to the campground on the right. Heading South From U.S. Highway 395 and State Highway 158 (June Lake Jucntion South) travel approximately 6.5 miles south on 395 and turn right onto Deadman Road and follow for 3.2 miles to Upper Deadman Campground. Turn toward the Group Campground turnoff onto FS Road 2S05F, across the road. Continue one mile to the campground on the right.
Driving directions (Google Maps) →What to Pack for Your Stay
Tuned to the live forecast for this park.
👔 What to Wear
- 👕
Long-sleeve shirt
Synthetic or merino, sun-protective.
- 🧥
Light shell or windbreaker
Even on warm days, wind can chill (avg wind 0 mph).
- 👖
Hiking pants or convertible
Layer for variable conditions.
- 🥾
Trail runners or low boots
Comfortable, broken in.
🎒 What to Pack
- 💧
Water
Bring at least 1L of water; more in heat.
- 🍫
High-energy snacks
A snack for the trail.
- 🧴
Sun protection
Sunscreen, sunglasses, brimmed hat.
- 🩹
First-aid kit
Blister patches, ibuprofen, tape, antiseptic wipes.
- 🗺
Offline map
Download your route in advance via Gaia, Caltopo, or OSM-based apps.
Recommendations adapt to the current forecast + trail stats. Use them as a starting point — local conditions, your experience, and the time of day you start all matter.
Plan Your Visit to OBSIDIAN FLAT
Heading to OBSIDIAN FLAT? A few things to know before you go:
- Reservations: popular sites fill up fast — check Recreation.gov 6 months in advance
- Fees: day-use and camping fees vary; check current rates on the official park page
- Trash & pack-out: follow Leave No Trace principles
- Wildlife: store food in bear boxes where provided; never feed wildlife
- Weather: the 5-day forecast above is updated every 6 hours; verify just before you go
Frequently Asked Questions
Do I need a reservation for OBSIDIAN FLAT?
No central reservation system listed for OBSIDIAN FLAT. Check the official page (https://www.recreation.gov/camping/campgrounds/231955) for the latest entry policy and availability.
How do I get to OBSIDIAN FLAT?
Heading North From U.S. Highway 395 and State Highway 203 (Mammoth Lakes Junction), travel 8.2 miles north on 395. Turn west onto Deadman Road and follow for 3.2 miles to Upper Deadman Campground. Turn toward the Group Campground turnoff onto FS Road 2S05F. Continue one mile to the campground on the right. Heading South From U.S. Highway 395 and State Highway 158 (June Lake Jucntion South) travel …
How do I contact OBSIDIAN FLAT?
You can reach the park at phone: 760-647-3045.
References & Official Resources
