| Crooked River caldera | |
| Map: | Oregon |
| Location: | Deschutes, Crook, and Jefferson counties, Oregon, U.S. |
| Coordinates: | 44.3°N -120.9°W |
| Type: | Caldera, supervolcano |
| Age: | 29.5 Ma |
| Volcanic Arc: | Cascade Volcanic Arc, Ochoco Mountains |
| Last Eruption: | 29.5 million years ago |
The Crooked River caldera is a large and ancient volcano that straddles three central Oregon counties. The diameter of the caldera is about 41x and is notable for the welded tuff present at Gray Butte, Smith Rock, Powell Buttes, Grizzly Mountain and Barnes Butte. The volcano is considered extinct and last erupted about 29.5 Ma.[1]