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

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North_Fork_Toutle_River_valley_in_November_1983.jpg‎ (543 × 353 pixel, file size: 39 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 from [1]

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This image is a work of a United States Geological Survey employee, taken or made during the course of the person's official duties. As a work of the United States Government, the image is in the public domain. For more information, see the USGS copyright policy.

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