| Active and Potentially Active Volcanoes in Washington | ||||
| 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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