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St. Paul District
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St. Paul MN 55101

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Posted 9/25/2017

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Updated September 2018


Location/Description

In order to allow watercraft to pass through stretches of river of various depths, Congress authorized a series of locks and dams along the Mississippi River. An integral part of those locks are miter gates.

Miter gates are comprised of two leaves that provide a closure at one end of a lock at a “miter” or angle. Each lock has a set upstream and downstream. In addition to other systems, these gates allow water levels within the lock to go up and down.

Locks and Dams 2 through 10 have used the same miter gates since their construction in the 1930s. Over time, the gates have been damaged and distressed, which has led to serviceability and safety issues. This project will replace the gates, increasing navigational longevity and operational readiness while decreasing repair costs and downtime due to maintenance or failure.

Status

Two U.S. Army Corps of Engineers districtsSt. Paul (MVP) and Rock Island (MVR)have been working collaborative on the design of new miter gates for the Upper Mississippi Navigation projects. Each gate has different design requirements due to differences in height and weight and site conditions.

The Lock and Dam 2 miter gates were awarded in fiscal year 2015, and fabrication was completed. Pending resolution of site specific anchorage and installation challenges, MVP plans to install the gates in 2021.

The Corps has designed gates for Locks and Dam 5A, 8, and 10 and advertised the contract for fabrication.  The Corps expects to award the contract in fall 2018. Fabrication of these gates is expected to begin in fiscal year 2019 with installations planned for 2021, 2022, and 2023 (Locks 8, 5A, and 10, respectively).

Additional future projects will be scheduled when funding is available.

 

Authority

The Upper Mississippi River 9-Foot Channel Navigation Project was authorized as part of the River and Harbor Act approved July 3, 1930.

Fiscal

Miter gate replacement design and construction at the locks and dams are accomplished with 100 percent federal funds.  Total work is estimated at $16.2 million. 

Fiscal Year 2018:

Design for Locks and Dams 5A, 8 and 10   $1.2 million
Award for Gates at 5A, 8 and 10              $16.2 million