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C'; " '. 00 - ~ ,"-, Foreword Rolling swiftly on its tortuous course through the hot. mid southwestern United States, battering its way through deep canyons. the Colorado was once con- sidered America's 1110s1 dangerous river. Man's desperate need for water in the arid Southwest caused him early to tum speculative eyes on the Colorado, but whenever he attempted to control it, he brought disaster upon himself. Farmers blessed with fenile desclt soil tapped the Colorado to irrigate their lands and create rich gardens. But each year the river's destructive spring floods destroyed their crops, and each year its flow dwindled away in summer's heat until all living things were faced with waler shortages. A great cry finally arose for control and conservation of the waters of the Colorado, the most valuable natural resource of this descI1 empire. The cry was answered. Bureau of Reclamation engineers successfully mastered the Colorado by designing and constructing one of the most significant engineering achievements of all time- Hoovcr Dam. The dramatic story of the dam's con- struction and the benefits it has brought are of world~wide intcrcst. This is that story. OJlis booklet does not presefll minute details of engineering techniques or rechnical data. Technical infimnation on the dam:S' design and construction is available in rhe Boulder Canyon Projecr repO!1s. Write rhe Bureau of Reclamation, Engineering and Re.\earch Cl'nter, P.o. Box 25007, DellI'<,/" C%mdo 80225, Atm: D-922 for information on these repu!1s.) 2 ~117";'; '''~, III '.' ) (l " , 7' {'r ,'~j/ ';l' ..,}-. '" .-......:.a; r . ~<< ,I .t II,"!" 1 ,,- .;/ CablclI'ay IOIVered men and equipmem into Black Canyon 10 work 011 the dal1l.