Condit Dam Removal Condit Dam Removal - Access Washington

Condit Dam Hydroelectric Project
Final Supplemental EIS
Downstream Sediment Management
• As described in the Canyon and Woody Debris Management Plan (PacifiCorp 2004),
the White Salmon River canyon below the dam would be surveyed to identify and
dislodge any woody debris that may be hindering fish passage. Removal of such
blockage would facilitate downstream transport of sediment and the natural formation
of riverbanks. Log jam removal would only be done in consultation with the fish
management agencies.
4.1.4 Significant Unavoidable Adverse Impacts
Downstream from the dam, movement of sediment from the reservoir through the channel and
floodplain redevelopment and formation are unavoidable adverse impacts. Therefore, large
volumes of sediment will move through the lower White Salmon River and into the Bonneville
pool of the Columbia River. The in-lieu site is likely to be filled with sediment until flood flows
flush it into the Bonneville pool. These deposition effects could be viewed as resulting from
Bonneville Dam creating a slack-water pool, rather than as a result of removing Condit Dam.
4.1-8