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Elwha River: Final Supplement to the Final Environmental Impact Statement
Elwha River Ecosystem Restoration Implementation
U.S. National Park Service
Date Created and/or Issued
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: The U.S. Department of the Interior is proposing mitigation measures to accomplish the following goals: (1) to protect municipal and industrial water users and two fish propagation facilities (hatcheries) during dam removal, (2) to provide flood protection at current levels, (3) to provide the ability to treat wastewater for those residents whose septic systems would be rendered ineffective, and (4) to protect listed fish to the maximum extent possible during and following dam removal. The preferred means to accomplish these goals include a new surface water diversion and intake; a new water treatment plant to remove suspended solids and to supply water to hatcheries and to industrial and municipal users during dam removal; a municipal water treatment facility; strengthening, raising, and lengthening existing levees or homes as needed; providing flood protection or alternate supplies for affected groundwater users; providing access to clean tributary habitat for bull trout; keeping the Washington State Department of Fish and Wildlife chinook-rearing channel open during dam removal; moving the tribal fish hatchery; and creating rearing ponds on nearby Morse Creek to ensure the survival of Elwha chinook during dam removal. The SEIS also updates cost information, describes the selected mitigation for trumpeter swans, proposes crushing and recycling concrete removed from the dams rather than transporting it to a land disposal site, and proposes the construction of a new trail and overlook to observe and interpret dam deconstruction. The no-action alternative is the same as in the FEIS, as this SEIS is considered an addition to that document. The proposed actions are located in Clallam County, on the Olympic Peninsula, in Washington State.
digital copy
Alternative analysis
Dam retirement
Elwha River, WA
Elwha Dam
Glines Canyon Dam
United States

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