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Scope/Content: Abstract: The U.S. Department of the Interior proposes to fully restore the Elwha River ecosystem and native anadromous fisheries through the removal of Elwha Dam and Glines Canyon Dam and implementing fish restoration and revegetation. Dam removal would occur over an 18-month to 2-year period. Elwha Dam would be removed by blasting, and Glines Canyon Dam by a combination of blasting and diamond-wire saw cutting. Lake Aldwell would be drained by a diversion channel, and Lake Mills by notching down Glines Canyon Dam. Stored sediment would be eroded naturally by the Elwha River. The project area is located in Clallam County, on the Olympic Peninsula, in Washington State. In addition to the proposed action, two other alternatives are examined. They are: the Dredge and Slurry alternative (removing fine-grained sediment prior to dam removal by using suction dredges, and sending the slurry to the Strait of Juan de Fuca in a pipeline), and No Action (dams are retained as is, without fish passage measures). The proposed action is also the Department of the Interior's preferred alternative. Short-term negative impacts from removing both dams could result from the release of sediment now trapped in the reservoirs. The finer grained particles could temporarily but significantly impact fish or other aquatic organisms. Impacts on water quality, river morphology, flooding, native anadromous and resident (e.g. trout and char) fisheries, living marine resources, wildlife, threatened and endangered species, vegetation, cultural resources, land use, recreation, aesthetics, and socioeconomics are examined in this environment impact statement. Both of the other alternatives would also have significant impacts on resources examined in this document.
Alternative analysis Dams Dam retirement
Elwha River, WA Elwha Dam Glines Canyon Dam United States