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USGS/Cascades Volcano Observatory, Vancouver, Washington
Active and Potentially Active
Volcanoes in Washington



-- From: Wright and Pierson, 1992,
Living with Volcanoes, The U.S. Geological Survey's Volcano Hazards Program: U.S. Geological Survey Circular 1073, 57p
Volcano Eruption type(s) Number of eruptions in past 200 years Latest activity (in years before present or year(s) A.D.) Remarks
Mount Baker Ash, lava 1 1870 Increased heat output and minor melting of summit glacier in 1975; some debris flows not related to eruption. History of extensive pyroclastic flows
Glacier Peak Ash More than 1? Before 1800  
Mount Rainier Ash, lava 1? 1882 History of massive debris avalanches and debris flows. Occasional very shallow seismicity
Mount Adams Lava, ash 0 More than 3,500 years ago Debris flows are the most recent events
Mount St. Helens Ash, dome, lava 2-3 1980 to present Continuing intermittent volcanic activity


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08/20/04, Lyn Topinka