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Late-summer flows could sideline Rock Island Dam

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WENATCHEE — Most power generation at Rock Island Dam could stop throughout late summer because of a combination of seasonably low Columbia River flows and effects of the river’s drawdown to take pressure off the damaged Wanapum Dam.

The Columbia River averages a late-summer flow of 75,000 to 80,000 cubic feet per second (cfs), says Gregg Carrington, managing director of energy resources for the Chelan County PUD.

Under current conditions, with the river’s approximate 26-to-30-foot drawdown between Rock Island and…

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