Mount St. Helens is a famous active volcano located in Washington State, known for its catastrophic eruption in 1980.

Mount St. Helens, located in Washington State, is one of the most well-known and active volcanoes in the United States. It erupted catastrophically on May 18, 1980, causing massive destruction and loss of life, as well as changing the landscape of the surrounding area. The eruption was a significant event in volcanic study, and the mountain is now a popular site for scientific research and tourism. While Mount Rainier is another prominent volcano in Washington, Mount St. Helens is particularly famous due to its 1980 eruption, which had major geological and environmental impacts.