# Crooked River caldera

- **Country:** United States
- **Coordinates:** 44.300000, -120.900000
- **Age:** 29.5 Ma
- **Type:** Caldera, supervolcano
- **Range:** Ochoco Mountains
- **Location:** Deschutes, Crook, and Jefferson counties, Oregon, U.S.
- **Last Eruption:** 29.5 million years ago

The Crooked River caldera is a large ancient volcano and vent complex that straddles three central Oregon counties. The diameter of the caldera is about . It 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.

**Source:** https://en.wikipedia.org/wiki/Crooked_River_caldera (Wikipedia, CC BY-SA)