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MSH80_st_helens_debris_avalanche_helicopter_09-16-80.jpg
After the May 18, 1980 eruption, Mount St. Helens' elevation was only 8,364 feet (2,550 meters) and the volcano had a one-mile-wide (1.5 kilometers) horseshoe-shaped crater. View here is from the northwest.
USGS Photograph taken on September 16, 1980, by Tom Casadevall.
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MSH81_coldwater_lake_outlet_channel_10-17-81.jpg
Outlet channels were built at Castle Lake and Coldwater Lake (shown here) to stabilize water levels and prevent overtopping of the debris dams.
USGS Photograph taken in October 17, 1981, by Lyn Topinka.
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MSH83_debris_avalanche_north_fork_toutle_11-30-83.jpg
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, 1980. 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 km/hr). It left behind a hummocky deposit with an average thickness of 150 feet (45 meters) and a maximum thicknes of 600 feet (180 meters).
USGS Photograph taken on November 30, 1983, by Lyn Topinka.
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MSH84_castle_lake_debris_avalanche_march_1984.jpg
The May 18, 1980 debris avalanche from Mount St. Helens covered over 24 square miles (62 square kilometers) of the upper Toutle River valley and blocked tributaries of the North Fork Toutle River. New lakes such as Castle Lake (pictured here) and Coldwater Lake were created.
USGS Photograph taken in March 1984 by Robert L. Schuster.
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MORE Mount St. Helens Debris Avalanche Images, 1980 to Current

Shasta82_hummocks_09-22-82_med.jpg
USGS Photograph taken September 22, 1982, by Harry Glicken.
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Adams97_aerial_adams_debris_avalanche_09-08-97.jpg
Aerial view, Mount Adams Debris Avalanche
USGS Photograph taken September 8, 1997, by Richard Iverson
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Adams97_aerial_adams_debris_aval_chute_09-08-97.jpg
Aerial view, Mount Adams Debris Avalanche
USGS Photograph taken September 8, 1997, by Richard Iverson
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[Image,275K,GIF]
Aerial view of toe of the October 20, 1997 debris avalanche at Mount Adams.
-- USGS Photo courtesy of U.S. Forest Service, October 1997

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Aerial view of toe of the October 20, 1997 debris avalanche, showing area of temporary lake
-- USGS Photo courtesy of U.S. Forest Service, October 1997

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