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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.
Ecology and river restoration Sediment and channel dynamics Dams Dam retirement
Little Sandy River, OR Sandy River, OR Marmot Dam United States