Oblique aerial view of eruption of Mount St. Helens, May 18, 1980. Skamania County, Washington. 1980.

Index card: Oblique aerial view of the eruption of May 18, 1980 which sent volcanic ash, steam, water, and debris to a height of 60,000 feet. The mountain lost 1300 feet of altitude and about 2/3-cubic mile of material. Note the material streaming downward from the center of the plume and the formation and movement of pyroclastic flows down the left flank of the volcano. Skamania County, Washington. May 18, 1980. (Photo by Austin Post, USGS/Glaciology).