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1983 Map of Mount St. Helens

Name: 1983 Topographic Map of Mount St. Helens
Creator: U.S. Geological Survey
Published: 1987
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1987

About this map

The massive 1980 Crater and its central Lava Dome dominate this 1983 provisional survey, which documents the radically altered landscape of Mount St Helens just three years after its cataclysmic eruption. The terrain reflects the immediate aftermath of the blast, showing the wide Breach opening toward the north and the extensive Pumice Plain. To the northwest, areas of Blowdown signify the power of the lateral pressure wave that leveled forests within the Gifford Pinchot National Forest.

Geological features unique to this active volcanic period are meticulously recorded, including the extensive Worm Flows and various named glaciers such as Shoestring Glacier and Ape Glacier that survived or reformed around the peak. The map also delineates the newly established Mount St Helens National Volcanic Monument boundary, providing a precise spatial record of a landscape in the earliest stages of recovery. Researchers can also locate recreational and geological curiosities like the Lava Caves and June Lake near the mountain's southern base.