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<br />~ <br />c. <br />CT' <br /> <br />... <br /> <br />c <br /> <br /> <br />Pellstock pip!' sections II'/'re [OlV/'rl'd ;1110 fhe C(/II)'OII by a 150-ton wpllcity cableway, then carried into the <br />tunnels on railroad cars. <br /> <br /> <br />The dam as seen from the control tower of the <br />J 5{)..tOli cablewo)' Oil rhe Nevada rim of Black <br />Canyon, December 1933 <br /> <br />of Black Canyon. Nevada Highway 93 <br />crosses the top of the dam. <br />The Government's contract had given <br />Six Companies. Inc., 7 years to finish <br />the job. Using efficient personnel, tbe <br />finest of equipment, and del1iled planning <br />before the start of construction, the com- <br />pany completed the contract 2 years <br />ahead of schedule. <br />One of the innovative ideas used dur- <br />ing the dam's construction was cooling <br />the concrete. Without artificial cooling, it <br />would have taken more than a century <br />for the dam to lose the heat created by <br />the setting cement, and it would have <br />shrunk and cracked as it cooled. The <br />solution, Reclamation engineers deter- <br />mined, was to build the dam in pier-like <br />blocks and cool the concrete by running <br />ice-cold water through pipes embedded in <br />the blocks. As the blocks contracted and <br />gaps appeared between them, cement <br />grout was pumped into the breaches, <br />making the structure monolithic -of one <br />piece. <br /> <br />23 <br />