Lava Tube

  • Lava Tube is a conduit where lava once flowed, cooled and created a cave-like hole in the rock above Lower Twin Lake. This geologic formation is commonly referred to as "Hole in the Wall." The Lava Tube is a popular destination for backcountry skiing: skiers begin from from the back side of Mammoth Mountain, an out-of-bounds area, and descend the experts-only slope through the rocky tunnel. Winter visitors are advised to view Lava Tube from the eastern shore of the lake because of avalanche danger. In the summer, you can walk around the lake for a closer look.

  • Lava Tube is a conduit where lava once flowed, cooled and created a cave-like hole in the rock above Lower Twin Lake. This geologic formation is commonly referred to as "Hole in the Wall." The Lava Tube is a popular destination for backcountry skiing: skiers begin from from the back side of Mammoth Mountain, an out-of-bounds area, and descend the experts-only slope through the rocky tunnel. Winter visitors are advised to view Lava Tube from the eastern shore of the lake because of avalanche danger. In the summer, you can walk around the lake for a closer look.

Destination Alerts

  • 05/24/2017: Thanks to the drought busting winter of 2017, trails above 7500 ft are still covered in snow. Please check back for updates.
  • Destination Activities

    • Ski & Snowboarding

    Public Services

    Hours of Operation: N/A

    Season: Year Round

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Related Trails

Related Trails

Trail Length (mi) Surface Activities and Services
Mammoth Mountain Trail 3.9 Soil Hiking
Seven Lakes Point Loop 0.6 Soil Hiking Vista Viewing
How to get involved Local recreation resources Experiences and ratings Finding your way around the MLTS