Slidewaters
$25–$50A lakeside water park in Chelan with ten slides, a lazy river and a surf wave pool.

Photo: Farwestern Photo by Gregg M. Erickson, CC BY 3.0, via Wikimedia Commons. Cropped and resized.
Grand Coulee Dam is a sightseeing stop in Coulee Dam, WA, part of the Central Washington guide. Cost: free. Laser light show runs nightly May 22 through September 30.
Visitor Center at the base of the dam, off WA-155 · Coulee Dam, WA
Grand Coulee Dam stretches 5,223 feet across the Columbia River and stands 550 feet high, holding back Franklin D. Roosevelt Lake. The Bureau of Reclamation visitor center, designed by Marcel Breuer to resemble a generator rotor, has hands-on exhibits on irrigation, flood control and hydropower, and on the dam's effects on Native Americans and settlers. On summer nights the One River, Many Voices laser show is projected onto the dam for about 30 minutes, with no ticket needed.
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