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Washington's North Cascades are a force of nature.

Three dams help harness that force, Ross, Diablo and Gorge.

Seattle City Light's popular 'Powerhouse Tour' takes visitors behind the scenes at these places so they can see how 18% of Seattle's power is generated.

Read or Share this story: http://www.king5.com/story/entertainment/television/programs/northwest-backroads/2014/08/04/13240150/