Connectivity
- T-Mobile5GGood coverageVerified by 0 campers
- VerizonLTESome coverageVerified by 0 campers
- AT&T5GExcellent coverageVerified by 0 campers
Community-reported service can change with terrain, weather, congestion, and carrier coverage.
Campground
Obsidian Flat
Inyo National Forest, California
About this campground
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.
It is situated in a pine forest at an elevation of 7,800 feet.
Map
Loading map
- Latitude
- 37.733333° N
- Longitude
- 119.016667° W
Know before you arrive
Access, sites & campground features
Official facility and campsite inventory, supplemented by clearly marked community reports when the official listing does not publish the detail.
Access
- Drive-in
- Walk-inCommunity report
Site types
- Tent sites
- RV / trailer sites
- Group sites
- Standard campsites
Features
For campers
- Toilets
- Picnic table
- FiresUse only when the current order allows flame
- Alcohol allowedCommunity report
- Trash serviceCommunity report
- Pets allowedDogs are allowed in developed Forest Service recreation sites when restrained, crated or caged, or on a leash no longer than six feet. Posted site restrictions still apply.
- Reservable
For vehicles
- Big rig friendlyPublished vehicle length up to 40 ft
- Back-in sitesCommunity report
Official campground guide
Plan with the full campground details
Facility information, site rules, booking windows, and published rates. Source snapshot checked Oct 18, 2026.
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.
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.
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.
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.
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
Activities & amenities
What Recreation.gov or the campground’s official source specifically lists.
Available activities
- Hiking
- Camping
- Off Highway Vehicle Trails
- Wildlife Viewing
Amenities and facility features
- Vault or pit toilets
- No potable waterThe official facility record directs campers to carry water
- Picnic tables
- Site fire ring or grillUse only when the current order allows flame
Recreation sites
Published inventory grouped by site type. Individual sites can have stricter limits.
Group Standard Non-Electric
1 site- Reservation type
- Site-Specific
- Equipment
- RV, Tent, Trailer
- Maximum people
- 50
- Maximum vehicles
- 15
- Maximum vehicle length
- 0 ft
- Check-in
- 3:00 PM
- Check-out
- 2:00 PM
- Accessible sites
- None flagged in site inventory
Site rules, inventory & rates
Facility rules, inventory procedures, and price seasons published by the official source.
Site rules
- Base site allowance
- $20 dollars per night
- Reservation cutoff
- 0 days before arrival
- Maximum published vehicles
- 15 vehicles per site
- Check-in
- 3:00 PM
- Check-out
- 2:00 PM
- Food storage
- Obsidian Flat's official facility record states: The site is fairly primitive and is equipped with a picnic table, vault toilet, campfire ring and bear-proof locker for food storage.
- Fire and stove use
- Obsidian Flat's official facility record states: The site is fairly primitive and is equipped with a picnic table, vault toilet, campfire ring and bear-proof locker for food storage.
- Pets
- Dogs are allowed in developed Forest Service recreation sites when restrained, crated or caged, or on a leash no longer than six feet. Posted site restrictions still apply.
Inventory window
Recreation.gov publishes a rolling booking window. The dates below are the official snapshot captured for this catalog build.
- Currently bookable through
- Sep 30, 2026
- Next release
- Dec 15, 2026, 7:00 AM PST
- Next book-through date
- Jun 15, 2027
- Group sites bookable through
- Sep 30, 2027
Published seasons & rates
| Season | Site type | Nightly rate | Additional person | Deposit |
|---|---|---|---|---|
| Peak SeasonJun 15, 2026 – Sep 30, 2026 | Group Standard Non-Electric | $20 | — | — |
| Peak SeasonJun 15, 2027 – Sep 30, 2027 | Group Standard Non-Electric | $20 | — | — |
| Peak SeasonJun 15, 2028 – Sep 30, 2028 | Group Standard Non-Electric | $20 | — | — |
Important facility notices
Read these with current closure and fire notices before departure.
- No drinking water available
- This facility is locked by a security gate; combination included in confirmation letter
- Contact Inyo National Forest regarding current snow levels and season opening and closing dates
- This is a high elevation facility; please use caution when traveling from lower elevations; campground usually not clear of snow until late May or early June
- Be bear aware; keep all food out of site in approved containers or locked inside your vehicle and remove all food from area after eating; always keep a clean camp and do not feed any wild animals
- Click here for more information about Inyo National Forest
- Don't Move Firewood: Protect California's forests from tree-killing pests by buying your firewood locally and burning it on-site. For more information visit firewood.ca.gov.
Getting there & contact
Official directions
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.
Facility contact
760-647-3045