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Text / Potential Geomorphic and Ecological Impacts of Marmot Dam Removal, Ssandy River, OR

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Potential Geomorphic and Ecological Impacts of Marmot Dam Removal, Ssandy River, OR
Portland General Electric Company
Date Created and/or Issued
Publication Information
Federal Energy Regulatory Commission (FERC)
Contributing Institution
UC Riverside, Library, Water Resources Collections and Archives
Clearinghouse for Dam Removal Information (CDRI)
Rights Information
Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user.
Scope/Content: Abstract: FERC issued docket number p-477: Marmot Dam is a 13-meter (42 ft) high hydroelectric diversion dam on the Sandy River that is owned and operated by Portland General Electric (PGE). In 1999, PGE announced its decision not to re-license the Bull Run Hydroelectric project and began the process of creating a decommissioning plan for the dam and associated facilities. The decommissioning plan calls for the complete removal of Marmot Dam during the summer of 2007, which will result in the release of approximately 750,000 cubic meters of fine and coarse sediment currently stored in the upstream reservoir. The release of such a large quantity of sediment into a river following dam removal has never been documented, and has raised questions about potential downstream impacts to aquatic habitat, water quality, and recreation.
digital copy
Ecology and river restoration
Sediment and channel dynamics
Dam retirement
Little Sandy River, OR
Sandy River, OR
Marmot Dam
United States

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