• 1980 Eruption
  • 2004 - 2008 Eruption
  • Crater Glacier
  • Past Eruptions
  • Facts and Research
  • Eruption Impacts and Return of Life
  • Changing Landscape
  • Facts and Research
  • Guided Hikes and Programs
  • Youth Volcano Camps
  • Field Trips
  • Community Events
  • Teacher Workshops
  • Volunteer
  • Overview
  • Indoor Facilities
  • Field Camp
  • Reservations
  • Activities
  • Volunteer at SLC
  • Geology Lessons
  • Biology Lessons
  • Plan Your Field Trip
  • Classroom Programs
  • Teacher Workshops
  • Useful Links

    • Debris Avalanche: Introduction

    The largest landslide in recorded history scoured and buried miles of river valley. Transformed by the forces of gravity and water, the valley is now home to a thriving new ecosystem.

    Back to Return to Life
    USGS / Peter Lipman 8 Mile Hi Group / Joel Harvey USGS / C. Dan Miller Washington State DOT Donald Lawrence University of Washington / Jerry Franklin USFS / Peter Frenzen USFS / Peter Frenzen University of Puget Sound / Ernie Karlstrom USFS / Peter Frenzen USFS / Peter Frenzen Tim Delano Quinault Indian Nation / Larry Workman Quinault Indian Nation / Larry Workman Quinault Indian Nation / Larry Workman USFS / Peter Frenzen USFS / Peter Frenzen Quinault Indian Nation / Larry Workman USFS / F. Valenzuela USFS / F. Valenzuela USFS / F. Valenzuela USFS / Peter Frenzen USFS / Peter Frenzen
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    The Mount St. Helens Science and Learning Center is a collaborative effort of the Mount St. Helens Institute and the U.S. Forest Service, Mount St. Helens National Volcanic Monument. Our mission is to connect people with nature through science, the arts and adventure recreation.

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