Newberry Volcano, Shield volcano in Deschutes County, Oregon

Newberry Volcano is a broad shield-shaped stratovolcano in Deschutes County, Oregon, whose summit caldera, about 4 by 5 miles across, holds Paulina Lake and East Lake. More than 400 cinder cones, lava flows and lava domes surround it, and Paulina Peak, its highest point, rises on the southwest rim.

Newberry Volcano began erupting about 600,000 years ago. Its caldera opened between 500,000 and 300,000 years ago and deepened through two or three later eruptions until about 75,000 years ago. The last eruption took place 1,300 years ago, and the volcano is still considered active and monitored by the United States Geological Survey.

The volcano's name honors John Strong Newberry, who explored central Oregon for the Pacific Railroad Surveys in 1855; geologist Israel Cook Russell named the crater for him in 1903. Lava flows less than 12,000 years old supplied obsidian that early Native peoples worked into simple tools. The site is now visited for tourism and recreation.

The area offers several trails, campgrounds, and viewpoints that are accessible year-round. Visitors should prepare for changing weather and wear sturdy footwear to navigate the uneven volcanic surfaces.

Newberry holds more than 400 vents, the most of any volcano in the contiguous United States. Its lava flows, several less than 12,000 years old, supplied obsidian that early Native peoples worked into simple tools. The Big Obsidian Flow also partly buried Lost Lake in the caldera's southern part.