Obsidian Dome Observation Site


Created by a Phreatic Blast - the explosion that takes place when magma reaches the water table and turns the water to steam - and the magma pushing up and cooling to create rock. This large dome is located West of Highway 395 north of Mammoth Lakes.

At a Glance

Usage: Light
Closest Towns: June Lake, CA
Water: No
Restroom: No
Operated By: Forest Service

General Information

Directions: From the town of Mammoth Lakes drive west on Hwy 203 to the 395 junction. Take 395 north for 10 miles and take a left on Glass Flow Rd/ Obsidian Dome Rd.


Areas & Activities



  Latitude : 

  Longitude : 

  Elevation : 
8556' (summit)


USFS Emblem and Travel Management

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