Initial fluvial response to the removal of Oregon's Marmot Dam

Eos, Transactions, American Geophysical Union
By: , and 



A temporary, 14‐meter‐high earthen cofferdam standing in place of Marmot Dam was breached on 19 October 2007, allowing the 80‐ kilometer‐long Sandy River to flow freely from Mount Hood, Oreg., to the Columbia River for the first time in nearly 100 years. Marmot Dam is one of the largest dams in the western United States (in terms of height and volume of stored sediment) to have been removed in the past 40 years, and its removal exposed approximately 730,000 cubic meters of stored sand and gravel to erosion and transport by the newly energetic mountain river. At the time, its breach represented the greatest release of sediment from any U.S. dam removal. (The March 2008 breaching of Montana's Milltown Dam exposed about 5–10 times as much sediment to potential erosion.)

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Initial fluvial response to the removal of Oregon's Marmot Dam
Series title Eos, Transactions, American Geophysical Union
DOI 10.1029/2008EO270001
Volume 89
Issue 27
Year Published 2011
Language English
Publisher AGU
Contributing office(s) Oregon Water Science Center, Volcano Science Center
Description 2 p.
First page 241
Last page 242
Country United States
State Oregon
Other Geospatial Marmot Dam
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