OBSIDIAN FLAT
OBSIDIAN FLAT
OBSIDIAN FLAT
OBSIDIAN FLAT

Featured amenities

Parking Parking
Pet Friendly Pet Friendly
Picnic Table Picnic Table
Restrooms Restrooms
Fire Pit Fire Pit

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.

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

Campground Amenities

Most popular amenities

Parking Parking
Pet friendly Pet friendly
Picnic Table Picnic Table
Restrooms Restrooms
Fire Pit Fire Pit
Water and Hygiene

Water and Hygiene

  • Restrooms
Cooking and Fire

Cooking and Fire

  • Picnic Table
  • Fire Pit
Parking and Transport

Parking and Transport

  • Parking
Pets and Policies

Pets and Policies

  • Pet friendly
Missing information?

1, Loop: OBSI

$20
/ per night
🚐 RV
  • Gravel
  • Driveway entry: Back-In

Site Details

Up to 50 guests
Surface: Gravel
Driveway entry: Back-In
View Site Details

Reviews (25)

What Guests Are Saying

Obsidian Flat is praised as a beautiful group campground in the Sierra, offering a great experience. However, it only has vault toilets and lacks running or potable water, so guests should bring their own toilet paper. Overall, it’s a lovely spot for group gatherings despite some basic limitations.

Review Summary

3.8
25 reviews
5
52.0%
13
4
24.0%
6
3
0.0%
0
2
0.0%
0
1
24.0%
6

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.

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 & Directions for Obsidian Flat

Box 429, Lee Vining, CA 93541 United States

Elevation: 2,397 ft

Getting There

<p>Heading North</p>
<p>From U.S. Highway 395 and State Highway 203 (Mammoth Lakes Junction), travel 8.2 mi north on 395. Turn west onto Deadman Road and follow for 3.2 mi to Upper Deadman Campground. Turn toward the Group Campground turnoff onto ...

Nearest town

Lee Vining, CA - 22 mi

About 31 min to downtown

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).

Nearby National Park

Yosemite National Park

South Entrance

Approximate driving time: over 1 hr (78 min)

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: October 20, 2026

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Explore Lee Vining, CA

Population: 628

Nearby larger city

Clovis, CA

Approx. 73 mi away (straight-line distance)

Elevation: 6,781 ft

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Managed by the USDA Forest Service