• 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
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    • Far Reaching Destruction

    Lahars (volcanic mudflows) are one of the most destructive and far-reaching impacts of eruptions. Their effects on downstream rivers and forests can last for many decades.

    Peter Frenzen, Forest Ecologist

    Back to Return to Life
    Washington State DOT USFS / Fred Swanson USGS / Lyn Topinka USGS / C. Dan Miller USFS / Jim Hughes University of Washington / Charlie Halpern University of Washington / Jerry Franklin Sue Baker USFS / Tom Lisle USFS / Peter Frenzen University of Washington / Jerry Franklin USGS / Tom Casadevall
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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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