. The mastery of water. By courtesy of the Chief Engineer, Reclamation Service. LAND IN ARIZONA BEFORE THE SAME LAND AFTER IRRIGATION. THE DESERT LANDS OF WESTERN AMERICA 95 The immensity of this scheme will best be understoodif a short account is given of the work required for thefirst 2,000,000 acres and their paltry 21,000 begin with, a large dam, the Laguna Dam, has beenthrown across the Colorado River near Yuma in is merely a weir which holds up the water so that itcan flow into two canals serving for 100,000 acres. Again in Arizona, the might
. The mastery of water. By courtesy of the Chief Engineer, Reclamation Service. LAND IN ARIZONA BEFORE THE SAME LAND AFTER IRRIGATION. THE DESERT LANDS OF WESTERN AMERICA 95 The immensity of this scheme will best be understoodif a short account is given of the work required for thefirst 2,000,000 acres and their paltry 21,000 begin with, a large dam, the Laguna Dam, has beenthrown across the Colorado River near Yuma in is merely a weir which holds up the water so that itcan flow into two canals serving for 100,000 acres. Again in Arizona, the mighty Roosevelt Dam has beenthrown across the Salt River where it flows in a deep,rocky caiion. This dam is 284 feet high and convertsthe river above it into a lake more than twenty-five squaremiles in area. To convey the machinery and material aroad had to be cut over the mountains. About 160,000acres of low-lying land will be irrigated by canal in theordinary way. But there are 50,000 acres more of thirstyland lying at a higher level. A special canal eighteenand a half miles long has been cut, and through this thewat
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