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| | Grand Coulee Dam. The Columbia Gazetteer of North America. 2000 |
 | | Grand Coulee Dam (KOO-lee), on Okanogan-Grant co. border, on Columbia R., N central Wash., 75 mi/121 km NW of Spokane; 550 ft/168 m high, 4,173 ft/1,272 m long; 47°57'N 118°59'W. One of the worlds largest concrete dams. |
 | | (B.C.) border; it is 1 of the largest reservoirs in the U.S. Hydroelectricity is produced at the dam; and water is diverted into Grand Coulee, a walled gorge of formerly dry basaltic rock, c.30 mi/48 km long, the prehistoric main channel of the Columbia R., through the Columbia Plateau. |
 | | Banks L., a large reservoir at N end of Grand Coulee gorge, controls water supply to more than 500,000 acres/202,350 ha to the valley and the plateau. |
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