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

  • 03/12/2018: SNOW AND WINTER CONDITIONS EXIST ABOVE 8000 FEET. EARLY SPRING CONDITIONS EXIST ON LOWER ELEVATIONS.

Avalanche Forecast for 04/26/2018

  • Loose Wet avalanches continue to be the primary concern through the forecast period. Timing is key to avoiding Loose Wet avalanches. Plan your travels to be clear of steep slopes before the snow become unsupportive. Signs the snow is becoming increasingly saturated, loose, and potentially unstable: pinwheels or rollerballs, small wet sloughs, and deep ski or boot-top penetration are indicators that the snow is becoming increasingly unstable and Loose Wet avalanches are becoming increasingly poss Find out More
  • Destination Activities

    • Ski & Snowboarding

    Public Services

    Hours of Operation: N/A

    Season: Year Round

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