Mount St Helens Eruption Shocks the Northwest
A historic eruption of Mount St Helens on May 18 1980 sent ash across 11 states and reached the eastern United States days later. Experts estimate 540 million tons of ash with a crater roughly 1 mile by 2 miles and depths near 2100 feet.
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Mount St. Helens
United States
Devastating Volcanic Avalanche Kills Dozens and Hails Wildlife Loss
A massive mud and rock avalanche swept a valley after a blast, burying the area with 150 feet of debris. About 60 people died, 1.5 million birds and other animals perished, and fish were killed. Roads and crops were ruined. Photos credit U S Geological Survey and Interior.
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Cascade Mountain Range
Mount St
Helens
Mount Shasta
Junt Aker
Aglacier
Mount Rainier
T Adams
Crater L
Lassen Peak
Jefferson
Hun
Washington
Photos
U.S. Geological Survey
Department of the Interior