Mount St. Helens - You Are Edge of the Blast Zone
The eruption of Mount St. Helens on May 18, 1980 triggered a huge landslide causing a powerful, laterally directed blast. A pyroclastic flow consisting of rock fragments, highly charged gas and super heated steam, devastated almost 150,000 acres of private, state and federal forests.
Side Bar:
In 1982 Congress established the 110,000 acre Mount St. Helens National Volcanic Monument. Inside the monument no salvage and no tree planting were permitted.
Marker is on Spirit Lake Highway (Washington Route 504), on the right when traveling east.
Courtesy hmdb.org
