Mt. St. Helens/Means Bean Clearwater ridge

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The lateral blast on May 18, 1980, toppled trees on thousands of acres in just a few minutes, creating the blowdown zone (photo by Charlie Crisafulli).


The lateral blast on May 18, 1980, toppled trees on thousands of acres in just a few minutes, creating the blowdown zone (photo by Charlie Crisafulli).