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Show ; ' Grand Coulee World" s Number One Dam Grand Coulee, biggest dam in the world, is now in action. The Columbia Co-lumbia river, which has been dammed, is one of the swiftest and fiercest in the world, and to curb it a barrier has been erected which is three-quarters of a mile long and 500 feet high. The result will be a lake 151 miles long, the irrigation of 1,200,-000 1,200,-000 acres of land, and sufficient electric power to supply an area five times the size of England. Boulder dam, which harnesses the Colorado river, with all its collateral col-lateral works, was completed in 1935. It is thrown across a terrific gorge called Black Canyon, which is 2,000 feet wide, and the lake behind be-hind it is 115 miles long and took three years to fill. So tremendous is the weight of water in this lake that geologists have suggested that it may cause a bending in the crust of the planet. |