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

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Description This downstream view of the North Fork Toutle River valley, north and west of St. Helens, shows part of the 0.55 cubic miles (2.3 km3) of debris avalanche that slid from the volcano on May 18. This is enough material to cover Washington, D.C. to a depth of 43 feet (13 m). The avalanche traveled approximately 15 miles (24 km) downstream at a velocity exceeding 150 miles per hour (240 km/h). It left behind a hummocky deposit with an average thickness of 150 feet (45 m) and a maximum thickness of 590 feet (180 m).
Date Taken on 30 November 1983
Source Archived source link
Author Lyn Topinka, USGS/CVO
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(Reusing this file)		 PD

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This image is in the public domain in the United States because it only 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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Date/TimeThumbnailDimensionsUserComment
current10:42, 5 April 2021Thumbnail for version as of 10:42, 5 April 20212,913 × 1,977 (2.51 MB)Hike395 (talk | contribs)higher resolution
04:49, 26 November 2010Thumbnail for version as of 04:49, 26 November 2010543 × 319 (104 KB)Aavindraa (talk | contribs)use original files' color
04:16, 15 July 2008Thumbnail for version as of 04:16, 15 July 2008543 × 319 (32 KB)Jarekt (talk | contribs){{Information |Description=Cropped watermark |Source= |Date= |Author= |Permission= |other_versions= }}
10:56, 14 March 2006Thumbnail for version as of 10:56, 14 March 2006543 × 353 (39 KB)Reelax (talk | contribs)== Description == 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 t

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