Mount St. Helens National Volcanic Monument

  • Mount St. Helens, Visitor Center, 3029 Spirit Lake Highway, Castle Rock, WA 98611

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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. Nearly 230 ... more on Fs.fed.us.

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Mount St. Helens National Volcan... Website

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