Tag: lock and dam
  • October

    Mississippi River Locks and Dams 2–10 Guidewall Crib Repairs

    Guidewalls are integral to each of the Mississippi River Locks and Dams 2 through 10. Guidewalls are long extensions of the lock walls, in either the upstream or downstream direction, that are parallel to the lock wall. These walls serve primarily to guide the long tows into the lock and to provide mooring facilities for tows too long to be accommodated in a single lockage. The guidewalls are constructed of multiple 35 to 40 feet length concrete monoliths with rock filled timber cribs beneath and behind them.
  • March

    Mississippi River Locks and Dams 2–10 Tow Rail System

    The tow rail system is integral to the operation of each of the Mississippi River Locks and Dams 2 through 10. It is attached to the top of the lock guidewall and helps guide tows through the lock chamber. Each system is comprised of an operating unit, rail and traveling kevel or “mule.” The Locks and Dams 2 through 10 tow rail systems have been deteriorating over the past several years, requiring rehabilitation of these systems.
  • Navigation: Mississippi River End Cells

    The purpose of this project is to extend the longevity of the guidewalls at each of our locks and dams and to reduce operability issues and required maintenance. An end cell would provide adequate protection of the end monolith along the guidewalls, while the past crib grouting component will add stability. Lock and Dams 2 through 10, which are located from Hastings, Minnesota, to Guttenberg, Iowa.
  • September

    Project Alteration Reviews: Section 408

    Section 14 of the Rivers and Harbors Act of 1899 authorizes the Secretary of the Army to grant permission for alterations to existing U.S. Army Corps of Engineers projects under certain circumstances. The authority is codified in 33 U.S.C. Section 408. Authority to approve alterations has been delegated to the district commander in most cases, although certain alterations require approval from the director of Civil Works at the Corps’ Headquarters. The Corps may grant permission for the alteration or permanent occupation or use of any of its public works when, in the Corps’ judgment, the occupation or use will not be injurious to the public interest and will not impair the usefulness of the federal works.
  • December

    Upper Mississippi River - Illinois Waterway System Navigation and Ecosystem Sustainability Program (NESP)

    Navigation and Ecosystem Sustainability Program (NESP) is a long-term program of ecosystem restoration and navigation improvements for the Upper Mississippi River System (UMRS). NESP will improve system capacity and reduce commercial traffic delays through construction of seven new 1,200-foot locks, mooring cells, and switchboat implementation.
  • February

    Upper Mississippi River 9-Foot Channel Navigation Project Locks and Dams, Minnesota/Wisconsin/Iowa

    The U.S. Army Corps of Engineers, St. Paul District is responsible for maintaining 244 miles of the Upper Mississippi River 9-foot channel navigation system from Minneapolis, Minnesota, to Guttenberg, Iowa. The Upper Mississippi River 9-Foot Channel Navigation Project is located in or contiguous to Minnesota, Wisconsin, and Iowa. The navigation project within the St. Paul District includes 13 locks and dams that are operated and maintained by the Corps. In addition to the locks and dams, the project includes channel maintenance, recreation and natural resource activities.