Saint Helens Mount

Mount Saint Helensvolcanic eruptionMay 18, 1980

Saint Helens

, Mount A volcanic peak, 2,550 m (8,365 ft) high, of the Cascade Range in southwest Washington. On May 18, 1980, a violent eruption reduced its height by about 400 m (1,300 ft) and covered a large area with mud and ash.