After Action Report, Lock and Dam Number 1, Rehabilitation, Minneapolis, Minnesota

Download or read book After Action Report, Lock and Dam Number 1, Rehabilitation, Minneapolis, Minnesota written by CORPS OF ENGINEERS ST PAUL MN ST PAUL DISTRICT. and published by . This book was released on 1983 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lock and Dam No. 1 is located at Mississippi River mile 847.6 above the mouth of the Ohio River and between the cities of St. Paul and Minneapolis, Minnesota. The lock and dam has been plagued by numerous problems, most of which were related to its overall structural stability, the poorly functioning hydraulic filling and emptying system, and aging operating machinery. The high potential for these problems to develop into a major failure, requiring closure of river traffic to Minneapolis, prompted the Corps of Engineers to initiate a comprehensive rehabilitation program in the early 1970's. The details of the project requirements were the result of thorough investigative work: historic research, interviews with personnel, economic analysis, engineering analysis and extensive condition surveys. Rehabilitation was broken into stages to insure minimal interruption to river traffic. The bulk of construction was performed in two winter periods. To complete on time, blasting was chosen as the medium for concrete removal. Completion of Lock and Dam no. 1 on June 30, 1983 was the culmination of over 20 years of research, planning, engineering, and construction. Rehabilitation had minimal affect on the river's environmental and commercial aspects and was performed at one-fourth the cost of reconstruction.