OutReserve

Obsidian Flat

OBSIDIAN FLAT
OBSIDIAN FLAT
OBSIDIAN FLAT
OBSIDIAN FLAT

Featured amenities

Parking
Restrooms

About Obsidian Flat

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.

Number of accommodations: 1

Seasonal information

2026 (Current year)

2026 Season availability

Current season
Upcoming seasons
Past seasons
Closed periods
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Currently closed - Opens on Jun 15

Campground Amenities

Most popular amenities

Parking
Restrooms
Water and Hygiene

Water and Hygiene

  • Restrooms
Parking and Transport

Parking and Transport

  • Parking
Missing information?

1, Loop: OBSI

Price not available
🚐 RV Unavailable

Site Details

Up to 50 guests
Hookup: No Hookups
Surface: Gravel
Driveway entry: Back-In
View Site Details

Reviews (16)

What Guests Are Saying

Obsidian Flat is a great group campground, ideal for gatherings. It features vault toilets but lacks running and potable water. Visitors should bring their own toilet paper to ensure availability.

Review Summary

3.8
16 reviews
5
50.0%
8
4
25.0%
4
3
0.0%
0
2
0.0%
0
1
25.0%
4

Jane W

Verified

November 15, 2021 Stayed at: 1, Loop: OBSI

1

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.

Jane W

Verified

November 15, 2021 Stayed at: 1, Loop: OBSI

1

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.

William D

Verified

September 6, 2021 Stayed at: 1, Loop: OBSI

5

Great group site with 2 bear cabinets, bar height meal prep table, 4 picnic tables, and 2 toilets. Plenty of room at this site as it will easily hold 50 campers in tents. Little hard to find. When you pull off Deadman Creak Rd go straight don't take any left or right turns and there is a sign that says dead end and that's where you are going. Gate code comes in reservation confirmation. You're pretty isolated and some cell service works. Activities are exploring, hiking, and biking. Deadman Creak has trout but the weird creek right by the site disappears into the ground even with a good flow.

William D

Verified

September 6, 2021 Stayed at: 1, Loop: OBSI

5

Great group site with 2 bear cabinets, bar height meal prep table, 4 picnic tables, and 2 toilets. Plenty of room at this site as it will easily hold 50 campers in tents. Little hard to find. When you pull off Deadman Creak Rd go straight don't take any left or right turns and there is a sign that says dead end and that's where you are going. Gate code comes in reservation confirmation. You're pretty isolated and some cell service works. Activities are exploring, hiking, and biking. Deadman Creak has trout but the weird creek right by the site disappears into the ground even with a good flow.

Rosa R

Verified

August 1, 2021 Stayed at: 1, Loop: OBSI

4

Good secluded location, ideal for bigger groups or those who want more privacy when camping. The security door allowed us to feel safe even when alone in the campground. Only issues were getting to the location, the campsite is farther from the road than expected, and it does not help that the road to get here is not paved and full of rocks. However we made it in a Toyota Sienna and a Honda Civic so any car would be able to travel without any problems.

Rosa R

Verified

August 1, 2021 Stayed at: 1, Loop: OBSI

4

Good secluded location, ideal for bigger groups or those who want more privacy when camping. The security door allowed us to feel safe even when alone in the campground. Only issues were getting to the location, the campsite is farther from the road than expected, and it does not help that the road to get here is not paved and full of rocks. However we made it in a Toyota Sienna and a Honda Civic so any car would be able to travel without any problems.

Location Obsidian Flat

Address:
Box 429
Lee Vining, CA, 93541
United States

Highway access

Obsidian Flat is accessible via U.S. Highway 395, located approximately 8.2 miles south from the junction with State Highway 203 (Mammoth Lakes Junction) and about 6.5 miles north from the junction with State Highway 158 (June Lake Junction South).

Latitude & Longitude: 37.7333 / -119.017

Elevation: 2397 feet

Policies & Rules

Arrival & departure

  • Access to the facility is secured with a combination lock provided in the confirmation letter.

Utilities

  • Drinking water is not available at this facility.

Local regulations

  • For current snow levels and seasonal dates, please contact Inyo National Forest.

Safety & rules

  • Due to high elevation, caution is advised when traveling from lower elevations; expect snow until late May or early June.

Wildlife & food storage

  • To prevent bear encounters, store food in approved containers or locked vehicles, keep a clean camp, and do not feed wildlife.

General

  • Click here for more information about Inyo National Forest

Fires & fuel

  • To protect forests, purchase firewood locally and do not move it; burn it on-site.

Nearby Campgrounds

Nearby destinations


Last updated: June 4, 2026

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Managed by USDA Forest Service