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File:North Fork Toutle River valley in November 1983.jpg

North_Fork_Toutle_River_valley_in_November_1983.jpg(543 × 319 pixels, file size: 104 KB, MIME type: image/jpeg)


This downstream view of the North Fork Toutle River valley, north and west of St. Helens, shows part of the nearly 2/3 cubic miles (2.3 cubic kilometers) of debris avalanche that slid from the volcano on May 18. This is enough material to cover Washington, D.C. to a depth of 14 feet (4 meters). The avalanche traveled approximately 15 miles (24 kilometers) downstream at a velocity exceeding 150 miles per hour (240 kilometers/hour). It left behind a hummocky deposit with an average thickness of 150 feet (45 meters) and a maximum thickness of 600 feet (180 meters). (November 30, 1983, by Lyn Topinka, USGS/CVO) USGS image


Description North Fork Toutle River valley in November 1983
Author U.S. government
( Reusing this file)



Public domain This image is in the public domain because it contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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