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Six Companies, Inc. was a joint venture of construction companies that was formed to build the Hoover Dam on the Colorado River in Nevada and Arizona.〔Herman, Arthur. ''Freedom's Forge: How American Business Produced Victory in World War II,'' pp. 37, 52-5, 210, Random House, New York, NY, 2012. ISBN 978-1-4000-6964-4.〕 They later built Parker Dam, a portion of the Grand Coulee Dam, the Colorado River Aqueduct across the Mojave and Colorado Deserts to urban Southern California, and other large projects. ==Hoover Dam== On January 10th, 1931, the Bureau of Reclamation made the bid documents available to interested parties, at five dollars a copy. The government would provide the materials, and the contractor was to prepare the site and build the dam. The dam was described in minute detail, covering 100 pages of text and 76 drawings. A $2 million bid bond was to accompany each bid. The winner would have to post a $5 million performance bond. The contractor would have seven years to build the dam, or penalties would ensue. A consortium was formed by eight smaller general contractors in order to submit a bid for the Hoover Dam construction contract.〔Herman, Arthur. ''Freedom's Forge: How American Business Produced Victory in World War II,'' pp. 37, 52-3, Random House, New York, NY, 2012. ISBN 978-1-4000-6964-4.〕 (They chose to call themselves Six Companies, Inc. as an allusion to Chinese Six Companies, where Chinese tongs in California took their grievances.) Because of the immense size of the first dam on the Colorado River, no single contractor had the resources to make a qualified bid alone. Harry W. Morrison of Morrison-Knudsen (Washington Group International, a division of URS Corporation) formed the joint venture and was elected president of it. He selected Frank Crowe, an employee of Morrison-Knudsen as the General Superintendent. Crowe was the true project manager of the undertaking. He drafted the bid, costed the project, won the project selection process, and hired each of the men who were employed during the course of the project. The Six Companies started working in about June 1931. Six Companies Inc. was composed of: #Henry J. Kaiser Co. of Oakland, California and Bechtel Corporation of San Francisco (Bechtel-Kaiser) - 30% #MacDonald and Kahn of Los Angeles, California - 20% #Utah Construction Company of Ogden, Utah - 20% #Morrison-Knudsen of Boise, Idaho - 10%, #Pacific Bridge Company of Portland, Oregon - 10% #J.F. Shea of Portland, Oregon - 10% The Six Companies Inc. won the contract in 1931, after a bid of US$48,890,955 (US$711,604,200.81 inflation adjusted). The project was so complex and large that only 3 bids were received. The Six Companies Inc. bid was $5,000,000 lower than the next bidder, meaning a bid-spread of almost 10%. The Six Companies completed construction of "Boulder Dam—Hoover Dam" two years ahead of schedule in 1935, although it took nine years (1938–47) under relative secrecy, to fix serious leaks with a supplemental grout curtain.〔Rogers, J David (''September 22, 2005''). ("Hoover Dam: Grout Curtain Failure and Lessons Learned in Site Characterization". ) Retrieved June 14, 2010.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Six Companies, Inc.」の詳細全文を読む スポンサード リンク
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