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Functioning as the gateway to the National Forest Service monument, Mount St Helens Visitor Center will entice you with scientific displays, a movie theatre and educational opportunities. Map & visitor guide Hours Summer: 9 a.m. - 5 p.m. Winter: 9 a.m. - 4 p.m. Closed Mondays and Tuesdays. Fees

Nov 9, 2023 · Mount St. Helens, located in Washington State, is the most active volcano in the Cascade Range, and it is the most likely of the contiguous U.S. volcanoes to erupt in the future. Sources/Usage: Public Domain. Visit Media to see details. Digital Elevation Map of Mount St. Helens with annotation of pre-1980 topography and deposits from 1980 - 2008.

Mount St. Helens is primarily an explosive dacite volcano with a complex magmatic system. The volcano was formed during four eruptive stages beginning about 275,000 years ago and has been the most active volcano in the Cascade Range during the Holocene.

On March 27, 1980, a series of volcanic explosionsand pyroclastic flowsbegan at Mount St. Helensin Skamania County, Washington, United States. A series of phreatic blastsoccurred from the summit and escalated until a major explosive eruption took place on May 18, 1980, at 8:32 am.

Home. Visit Us. destination. Mount St. Helens National Volcanic Monument. At 8:32 Sunday morning, May 18, 1980, Mount St. Helens erupted, shaken by an earthquake measuring 5.1 on the Richter scale, the north face of this tall symmetrical mountain collapsed in a massive rock debris avalanche.