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LANDSLIDE DAMMED LAKES AT MOUNT ST. HELENS, WASHINGTON.

By: , , and 
Edited by: Schuster Robert L.

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Abstract

The collapse of the north face of Mount St. Helens on May 18, 1980, and the debris avalanche that resulted blocked outflow from Spirit Lake and Coldwater and South Fork Castle Creeks. Spirit Lake began to increase in size and lakes began to form in the canyons of Coldwater and South Fork Castle Creeks. Coldwater and Castle Lakes would have overtopped their respective blockages in late 1981 or early 1982. Catastrophic flooding would have occurred from the breakout of Coldwater Lake while serious flooding probably would have resulted from the breakout of Castle Lake. As a result, the level of both lakes was stabilized with spillways in 1981. The three blockages are stable against liquefaction and gravitationally induced slope failure. The existence of groundwater in the blockages was observed in piezometers installed between 1981 and 1983. Groundwater mounds with water levels above lake level exist under the crest of all of the blockages.

Suggested Citation

Meyer, W., Sabol, M.A., Schuster, R., 1986, LANDSLIDE DAMMED LAKES AT MOUNT ST. HELENS, WASHINGTON., Landslide Dams: Processes, Risk, and Mitigation. Proceedings of a Session in Conjunction with the ASCE Convention., Seattle, WA, USA, p. 21-41.

Publication type Conference Paper
Publication Subtype Conference Paper
Title LANDSLIDE DAMMED LAKES AT MOUNT ST. HELENS, WASHINGTON.
ISBN 0872625249
Year Published 1986
Language English
Publisher ASCE (Geotechnical Special Publ n 3)
Publisher location New York, NY, USA
First page 21
Last page 41
Conference Title Landslide Dams: Processes, Risk, and Mitigation. Proceedings of a Session in Conjunction with the ASCE Convention.
Conference Location Seattle, WA, USA
Additional publication details