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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 Photo by Robert L. Schuster, March 1984

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Aerial view, Coldwater Lake, with debris avalanche hummocks in the foreground. Coldwater Ridge Visitor Center sits on the ridge to the west (left), overlooking the lake.
-- USGS Photo by Lyn Topinka, January 13, 1984

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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 km/hr). It left behind a hummocky deposit with an average thickness of 150 feet (45 m) and a maximum thicknes of 600 feet (180 meters).
-- USGS Photo by Lyn Topinka, November 30, 1983

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Looking downstream along the Upper Toutle, at Mount St. Helens' debris avalanche.
-- USGS Photo by Lyn Topinka, February 2, 1984

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Looking upstream at Mount St. Helens with debris avalanche hummocks. In foreground is confluence of Loowit, North Fork Toutle, and Castle drainages.
-- USGS Photo by Lyn Topinka, August 12, 1985

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Looking upstream at Mount St. Helens with debris avalanche in the foreground. Note regrowth along debris avalanche.
-- USGS Photo by Lyn Topinka, April 16, 1990

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May 18, 1980 debris avalanche at Mount St. Helens, view showing Johnston Ridge, The Spillover, and avalanche terraces. Spirit Lake is in middle right.
-- USGS Photo by Terry Leighley, USGS/Sandia Labs, July 8, 1981

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Mount Shasta and debris avalanche hummocks.
-- USGS Photo by Harry Glicken, September 22, 1982

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Aerial view of Mount Adams and the August 31, 1997 debris avalanche.
-- USGS Photo by R. Iverson, September 8, 1997

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Aerial view of the August 31, 1997 debris avalanche at Mount Adams.
-- USGS Photo by R. Iverson, September 8, 1997

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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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