| Active and Potentially Active Volcanoes in Oregon | ||||
| Volcano | Eruption type(s) | Number of eruptions in past 200 years | Latest activity (in years before present or year(s) A.D.) | Remarks |
|---|---|---|---|---|
| Mount Hood | Ash, dome | 2? | 1865 | Occasional seismic swarms |
| Mount Jefferson | Ash, lava | 0 | More than 50,000 years ago | Debris flows in 1934, 1955; young basaltic flows in nearby area |
| Three Sisters | Ash, lava | 0 | 950? | Debris flows in this century |
| Crater Lake | Lava, ash, dome | 0 | 4,000 years ago | Largest known eruption from Cascade Range volcano. Catastrophic, caldera-forming eruption 7,000 years ago; post-caldera lava and domes |
| Newberry Crater | Ash, lava | 0 | 600 | Latest eruption was obsidian flow |
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