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For weeks after the May 18, 1980 eruption of Mount St. Helens, volcanic ash covered the landscape around the volcano and for several hundred miles downwind to the east. Noticeable ash fell in eleven states. The total volume of ash (before its compaction by rainfall) was approximately 0.26 cubic mile (1.01 cubic km), or enough ash to cover a football field to a depth of 150 miles (240 km). In this photograph, a helicopter stirs up ash while trying to land in the devastated area.
-- USGS Photo by Lyn Topinka, August 22, 1980

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Bear tracks in volcanic ash from Mount St. Helens.
-- USGS Photo by Lyn Topinka, October 1980

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Volcanic ash blankets young evergreen.
-- USGS Photo by Lyn Topinka, 1980

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