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.

Avalanche Forecast for 03/25/2019

  • The avalanche danger will be MODERATE at Upper and Middle elevations today. Wind slab avalanches on N-E aspects are the chief concern primarily in the northern part of the forecast zone. Avalanche danger remains less concerning in the southern end of the forecast zone where much less snow fell over the weekend.THE SHADY REST WINTER TRAILS WERE LAST GROOMED AT 9:00 AM 3/25/19 Find out More
  • Destination Activities

    • Ski & Snowboarding

    Public Services

    Hours of Operation: N/A

    Season: Year Round

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