After nearly 10 months of working around the clock to repair and strengthen Wanapum Dam’s spillway, Grant County PUD will soon be able to raise the reservoir behind the dam.
Subject to the approval of the Federal Energy Regulatory Commission (FERC), the river level will begin to gradually fill sometime between November 24 and December 11 based on river flows and structural-integrity measurements. When complete, the river will be restored approximately 17 feet above current levels.
This partial refill will take between six and 18 days to reach the target elevation. This increased reservoir level will allow fish ladders to resume normal operations and allow the utility greater flexibility in managing hydroelectric generation over the winter months.
While the reservoir increases, shoreline enforcement patrols will remain in effect and the Wanapum shoreline will remain closed. Once engineers, law enforcement, and cultural resource workers have determined it is safe to restore access to the shoreline, the utility will notify the public.