National Geographic : 1960 Apr
GEOGRAPHICPHOTOGRAPHERB. ANTHONYSTEWARTW) N.G.S. Grand Coulee Turns On a Flaming Waterfall Largest concrete structure in the Nation, the dam stretches 4,173 feet across the Columbia. Roosevelt Lake, Grand Coulee's reser voir, backs up 151 miles to the Canadian border; its wa ters will irrigate a million acres in central Washington. Eleven gates above the spill way unleash a cascade twice as high as Niagara's. Lights of the town of Coulee Dam, Washington, glitter at right. Giant floodlights throw rainbow colors against the spillway. Each globe casts a 1,500-watt glow.