Mount St. Helens

Mount St. Helens is an active stratovolcano in southwestern Washington State, within the Cascade Range. It is best known for its major explosive eruption on May 18, 1980, which dramatically altered the summit and surrounding landscape.

The mountain remains an active volcanic system monitored by geological agencies and is visited for its eruption scars, ecological recovery zones, and interpretive facilities. Trails and viewpoints provide access to vistas of the crater, blast zone, and Spirit Lake area; some routes require planning and seasonal access checks.

Construction and geological study of the volcano intensified after the 1980 eruption, and monitoring networks now track seismicity, gas emissions, and ground deformation to provide early warnings of renewed activity. Scientific research and education are ongoing features of the site.

Mount St. Helens lies in the Gifford Pinchot National Forest in southwestern Washington, north of the Columbia River Gorge and within driving distance of regional cities; visitor facilities such as Johnston Ridge Observatory are located on the mountain’s northern approach.

• 1980 eruption: The major 1980 eruption on May 18 removed the volcano's summit and produced a lateral blast; its effects reshaped the mountain and surrounding landscape.

What to See #

• Johnston Ridge Observatory: Johnston Ridge Observatory - a visitor centre and viewpoint on the north side that provides exhibits, trail access, and views into the 1980 crater area.
• Crater rim and Spirit Lake: Spirit Lake area and the crater rim - landscape features dramatically altered by the 1980 eruption and studied for ecological recovery and geology.