Lassen Peak (10,457 feet, or 3,187 meters) is a volcano in northern California, at the southern end of the Cascade Mountains. Lassen Volcanic National Park lies around the volcano. The peak was named for Peter Lassen, who blazed an early trail across its slopes. The volcano erupted several times between May 1914 and June 1917. In May 1915, it produced lava and mud and an explosion that flattened the adjoining forest.
