Mount Shasta Volcano

The Cascade Range is a string of volcanic centers extending from Northern California into southern British Columbia, Canada. In California, the Cascades include Lassen Peak, Mount Shasta, and the Medicine Lake shield volcano. The Medicine Lake shield volcano produced a glassy obsidian flow in its most recent eruption about 900 years ago. Over the last 4,500 years, Mount Shasta has erupted on average every 600 years. It last erupted about 200 years ago. Mount Shasta is also one of the most prominent topographic features on the planet, rising 11,000 feet (3,350 meters) above the plain below. Lassen Peak last erupted in 1914-1917! The only other volcano in the continental United States to have erupted in the 20th century is Mount St. Helens in Washington.

Print No. A99NW-24-9.

More images from the California Cascades.