Condit Dam Removal Condit Dam Removal - Access Washington

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Condit Dam Hydroelectric Project Final Supplemental EIS Ramp function would be lost. EVC types may degrade in the short-term from a Type IV to Type V before reverting back to Type IV or Type III or higher in the long term. Reservoir Shoreline The area along the former shoreline between the former dam and the Northwestern Lake Bridge would have the same short-term impacts as described above. However, this area is more visible from private homes along or above the current shoreline. EVC Types I and II would temporarily degrade to III and IV. Areas currently classified as Types IV and V could degrade to Type VI. Over time, most of the areas on the slopes will revert to Types II or III. Northwestern Park/Northwestern Lake Bridge This area would experience the same impacts as the other areas. Visual impacts from the park or bridge viewpoints would degrade in the short-term from Type III and IV to Type IV and V, then revert back with revegetation of slopes. 4.10.3 Mitigation Measures PacifiCorp has proposed several measures to mitigate impacts from the Proposed Action. The measures include: • Implement a revegetation plan on suitable substrate along the former shoreline and slopes. The newly formed river channel is expected to average about 128 feet wide. The revegetation efforts may take a year or more. The vegetation would be monitored over time. Preconstruction photographs and preproject bathymetry show flatter and rockier areas for a few thousand feet above the current dam. About 40 to 50 percent of the acreage along the shoreline would include areas of residual sediments that could be revegetated. The other 50 to 60 percent consists of rocky substrate in an incised channel about 2,000 feet upstream of the existing dam. The goals of the plan would be to minimize the long-term potential for erosion and minimize the presence of noxious weeds. The specific site areas would not be known until after dam removal (See the Revegetation Plan). • Remove unstable residual sediments as quickly as feasible after dam removal. Sediment assessment and management and bank stabilization plans have been prepared. • Implement an upland stormwater and erosion control plan. • Construct new or enhance existing recreational facilities impacted by the Proposed Action. Specifically, extend the boat launch at Northwestern Lake Park to access the river. New recreational opportunities (kayaking, rafting, and stream fishing) would provide different aesthetic/scenic perspectives that may compensate in some ways for the loss of reservoir-based aesthetic/scenic resource perspectives. 4.10-9
Condit Dam Hydroelectric Project Final Supplemental EIS 4.10.4 Significant Unavoidable Adverse Impacts Short-term significant unavoidable adverse impacts to views along the reservoir would occur until revegetation occurs and the free-flowing river is reestablished. One overall significant long-term visual impact to aesthetics and scenic resources would remain and would be unavoidable. That would be the change from a lake view to a view of a stream corridor. However, depending on one’s perception, this may or may not be a significant impact. 4.10-10
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Condit Dam Removal Final SEPA Suppl
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March 23, 2007 Dear interested part
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Condit Dam Hydroelectric Project Fi
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Page 125 and 126: Condit Dam Hydroelectric Project Fi
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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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