Umatilla National Wildlife Refuge (http://www.fws.gov/refuge...), a 14,000-acre wildlife refuge straddling the Columbia River in Washington and Oregon. Entry points are in Irrigon, Oregon, and off Highway 14 in Washington
Crown Point Overlook State Park
From state route 155 in Grand Coulee, take the turnoff to Bridgeport (state Route 174), drive two miles north, look for a sign 'Crown Point Vista'
The best spot for viewing the Grand Coulee Dam.