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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

Mount St Helens stands at the center of this map, fundamentally altered following its 1980 eruption. This provisional survey documents the immediate aftermath of the geological event, showing the massive 1980 Crater and the emerging Lava Dome. To the north, The Breach opens into the Pumice Plain, where the landscape was scoured and reshaped by debris and pyroclastic flows. Evidence of the blast is recorded in the surrounding Gifford Pinchot National Forest, with significant areas of Blowdown marked where standing timber was leveled.

The mountain's southern slopes retain vestiges of older formations, including the Lava Caves and Butte Camp Dome, even as the new Mount St Helens National Volcanic Monument boundary is established. The glaciers—including Shoestring Glacier, Dryer Glacier, and Forsyth Glacier—are shown in their post-eruption states, providing a critical baseline for researchers studying volcanic recovery and glacial recession in the Pacific Northwest.