US Army Corps of Engineers
Rock Island District Website

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Archive: December, 2014
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  • December

    Sector Gates Raised After 35 Years

    For the first time in 35 years, the 255,000-pound sector gates at the Thomas J. (T.J.) O’Brien Lock and Dam are being raised and repaired as part of a critical maintenance project designed to rehabilitate the 54-year-old facility. T.J. O’Brien Lock and Dam is a unit of the Illinois Waterway Navigation System and is located at the entrance to Lake Michigan in Chicago, Illinois.