This north-looking, low-oblique photograph features snowcapped Lassen Peak Volcano and the tree-covered mountains of the surrounding Lassen National Forest. A stratovolcano with a summit lava dome, the 10 457-foot (3189-meter) volcano last experienced eruptions between 1914 and 1921, with the most severe eruption occurring in May 1915 when a series of hot avalanches descended the mountain slopes. Until Mount Saint Helens in Washington erupted in 1980, Lassen Peak had recorded the only volcanic eruption in the 48 contiguous states in the 20th century. Rectangular cutting patterns created by timber companies are scattered throughout Lassen National Forest. Visible within the Lassen Volcanic National Park are Snag Lake and Juniper Lake, east and east-southeast, respectively, of the volcano, and the northern half of Lake Almanor.