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

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Summary

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
Permission (Reusing this file)	PD

Licensing

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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File history

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	Date/Time	Dimensions	User	Comment
current	10:42, 5 April 2021	2,913 × 1,977 (2.51 MB)	Hike395	higher resolution
	04:49, 26 November 2010	543 × 319 (104 KB)	Aavindraa	use original files' color
	04:16, 15 July 2008	543 × 319 (32 KB)	Jarekt	{{Information \|Description=Cropped watermark \|Source= \|Date= \|Author= \|Permission= \|other_versions= }}
	10:56, 14 March 2006	543 × 353 (39 KB)	Reelax	== 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