Obsidian Flat

Show on map760-647-3045
BOX 429
LEE VINING, CA 93541

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

Camp site features

Across 1 camp site:

  • Group sites: all 1 sites
  • Largest party: 50 people

Fees

$20 dollars per night

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.

Stay Limit

Check in from 3 PM, check out by 2 PM.

Reviews

8 reviews
5 stars
4
4 stars
2
1 stars
2
Lee T
Loop:Obsi
Site:
Reviewed a year ago
This is a great group campground, although remember that it only has vault toilets, no running nor potable water. You might want to bring some toilet paper in case they run out.
Ines M
Loop:Obsi
Site:
Reviewed 3 years ago
THE CAMPGROUND DOES NOT EXIST IT IS A ROAD END WITH FALLEN TREES. Horrible
Sharon C
Loop:Obsi
Site:
Reviewed 4 years ago
The location was great, however, getting out of the campsite- around the curve near the bathroom was a bit challenging with our 32 ft trailer. Otherwise, we loved the location.
Sharon C
Loop:Obsi
Site:
Reviewed 4 years ago
Very Peaceful and private campground. Dirt road is not too difficult. I will definitely come back!! I hope this site stays open so we can return.
Roman D
Loop:Obsi
Site:
Reviewed 4 years ago
Great site, lots of space, good toilets, I really like how the locked gate kept the side by sides from driving up to the camp.
Jane W
Loop:Obsi
Site:
Reviewed 5 years ago
We never found the group camping site. Sign pointed to group camping site at a road needing 4 wheel drive and we only had a camper van. Highly recommend finding camp before dark. If I don't see the road sign for Dead man creek rd I would not have believed we were in the right place.
Availability

See the Camp Sites section below to find detailed booking availability.

Popularity: Quiet

Busiest in August, when about 37% of guest capacity is reserved. Based on 11 years of reservations.

Camp Sites

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