Condit Dam Removal Condit Dam Removal - Access Washington

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Condit Dam Hydroelectric Project Final Supplemental EIS Public Safety • Potential impacts to public safety resulting from the dam breaching and reservoir dewatering. • Potential impacts to public safety resulting from potentially unstable slopes in the area of the former reservoir. Public Services • Temporary interruption of water supply during the installation of a temporary or permanent water supply pipeline. • Potential impacts to local police and fire departments from emergencies or other incidents that may occur during the dam breaching and reservoir dewatering activities that would warrant a response. 2-8
Condit Dam Hydroelectric Project Final Supplemental EIS 3.0 PROPOSED ACTION PacifiCorp proposes to remove the Condit Hydroelectric Project on the White Salmon River in accordance with the Condit Hydroelectric Project Settlement Agreement, as amended (Appendix A). Removal of the project would enable the river and watershed to return to its natural free-flowing condition. Originally completed in 1913, Condit Dam has since accumulated sediment and blocked fish passage. Removing the dam would begin the process of reversing many of the original impacts from building and operating the dam and hydroelectric facilities. Restoring river flow without the dam would provide access to as much as 15 to 32 miles of river and tributary habitat for anadromous salmon and steelhead, respectively, and would restore connectivity to foraging, spawning, rearing, and overwintering habitat for bull trout in the lower White Salmon River. The removal also would restore natural bed load movement processes in the river. This would result in an increased gravel supply for bull trout spawning habitat. Combined with a stable and natural flow regime, dam removal would result in increased salmonid (steelhead, salmon, and bull trout) production potential. The existing Condit Hydroelectric Project includes a concrete dam, an approximately 1.8-milelong reservoir, a 13.5-foot-diameter wood-stave pipeline of approximately one mile in length, a reinforced-concrete surge tower, two 650-foot-long penstocks (one steel and one wood), and a powerhouse structure housing two double-runner horizontal Francis turbines with an installed capacity of 14,700 kilowatts. The proposed action includes draining the reservoir through a tunnel that would be constructed through the dam, removing the dam, removing the wood stave pipeline, the surge tower and the two penstocks, and filling in the tail race at the power house. Concrete from the dam and wood from the pipeline would be disposed of and/or staged on property near the dam. Details of the proposed action are described in the Condit Hydroelectric Project, FERC Project No. 2342, Project Description (PacifiCorp 2004). The project description includes numerous plans designed to minimize or eliminate potential impacts related to the project. The stages of the project are: (1) pre-dam removal activities, (2) dam breaching and removal, and (3) postremoval management. 3.1 PRE-DAM REMOVAL ACTIVITIES In order to implement the terms of the Settlement Agreement and perform the removal and associated restoration work, temporary work areas, staging areas, and access roads would need to be established and utilized. All locations were chosen to minimize potential impacts by establishing them in or near previously used access roads and work areas when possible. Table 3-1 summarizes access road names and their proposed uses. Figures 3-1 through 3-6 show the dam, associated facilities, staging areas, and haul routes. 3.1.1 Staging Areas and Disposal Areas Sites would be required to stage the heavy equipment that would be used for building or upgrading access roads and preparing the dam and associated facilities for demolition. The 3-1
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Appendix A Memorandum of Agreement
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Appendix C Supplemental Aquatic Res
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Agency and Organization Letters and
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Agency and Organization Letters Con
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Contents Public Meetings Response P
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Contents Individuals Individuals A-
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