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Hoover
Dam , Nevada / Arizona Web
Links : Hoover
Dam History: The information below was taken from the Arizona-Leisure wesite. “Hoover Dam” or “Boulder Dam”. Few know that Hoover Dam was originally named Boulder Dam. That’s because the initial planned site was at Boulder Canyon about 10 miles north upriver from where it is now located at Black Canyon. An engineering reassessment moved the location from Boulder Canyon to its present location. The Herbert Hoover administration changed the name from Boulder Dam to Hoover Dam in 1930 as a political move. In 1933, the Franklin Roosevelt administration changed it back to Boulder Dam, and under Harry Truman, the permanent name of Hoover Dam was restored. Six construction firms created a consortium call Six Company, Inc. to submit a competitive proposal to build Hoover Dam. As the lowest qualified bidder at $48,890,955, Six Company was awarded the contract. It was given incentive bonuses and would be fined for each day construction overran the assigned schedule. Thus began a furious pace of around the clock construction, which would result in completion of Hoover Dam almost two years ahead of schedule. The Great Depression led to massive migration of the unemployed to Las Vegas in hopes of landing jobs building Hoover Dam. Men came from around the country, many bringing families and life’s possessions hoping for employment. Living conditions were difficult and became substantially much worse when construction began, creating the shantytown known as Ragtown. Read more about the Men, Women and Children of Hoover Dam where life became a living hell. Life was particularly difficult for the few blacks that were hired as token to government mandate. Hoover Dam required over 3,250,000 cubic yards of concrete plus another million for the power plant, intake towers and other support structures. Two batch plants onsite were created to produce the concrete that was transported on railcars in large four and eight cubic yard buckets. An overhead cableway system lifted the buckets and lowered them to the forms. At peak production, one bucket was delivered about every 78 seconds. The base of Hoover Dam alone required 230 individual gigantic blocks of concrete. Five-foot tall blocks of varying width, ranging from 25 square feet on the downstream face to 60 square feet on the upstream face. Columns were linked together like a giant Lego set with a system of alternating vertical and horizontal schemes. It is interesting to note that it would have taken about 100 years for the concrete to cool and properly cure without engineering intervention. The chemical heat generated by concrete setting was dissipated by imbedding over 582 miles of one-inch steel pipe through the interconnecting concrete blocks that circulated ice water. Its own ammonia refrigeration plant that cooled the water was capable of creating a gigantic 1000 pound ice block every day. The cooling pipes were subsequently back-filled with concrete to create added strength. As an arch-gravity dam, the massive water pressure of up to 45,000 pounds per square foot at the base of Hoover Dam, is held back by gravity. The arch-curved structure against the lake reservoir dissipates that pressure into the canyon walls equally on the Arizona and Nevada side. It was the job of High Scalers to hang dangerously by rope above the canyon to blast and remove weakened and loose rocks from the face of the Black Canyon cliffs where the ends of Hoover Dam would join. Read more about these High Scalers that risked their lives not only performing their jobs, but also entertaining workers below with thrill-seeking and death-defying stunts along the cliff walls.
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