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Scope/Content: Abstract: Executive Summary- PacifiCorp's Klamath River hydroelectric dams have accumulated mineral sediment and organic detritus for decades in four impoundments with a surface area totaling approximately 2,270 acres. If the dams are removed, inundated land will be exposed to surface processes and the areas will require management to meet the intention of the Secretarial Determination and obligations of relevant agreements. This document describes current and anticipated conditions in the reservoir areas after removal of J.C. Boyle, Copco No.1, Copco No. 2, and Iron Gate dams on the Klamath River. It also describes the management plan of the three reservoir areas of J.C. Boyle Reservoir, Copco Reservoir, and Iron Gate Reservoir. Copco No. 2 is a relatively small dam located in a steep canyon and there will not be a significant area exposed to surface processes. It does not describe the impacts associated with Dam Removal to the downstream channel and does not detail the simulation of the reservoir drawdown and associated reservoir erosion. More detailed analysis of the surface water hydrology, groundwater hydrology, hydraulic conditions, and sediment transport if the dams were to remain in place (No Action Alternative) and if the dams were to be removed (Dam Removal Alternative) are presented in Reclamation (2011b). The construction aspects of dam removal are presented in Reclamation (2011a). There will be several stages of reservoir response while the reservoir pool is lowered and after dam removal. Each reservoir has unique characteristics that will result in unique behaviors, but generally, they can be described by a series of seven processes. Each process will operate to various degrees in each reservoir depending on the current deposit thickness, the reservoir geometry, and vegetation types and distribution.
Pre- and post-project monitoring Dams Dam retirement
Klamath, CA Klamath, OR J.C. Boyle, Copco No. 1, Copco No. 2, and Iron Gate Dams