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St. Paul District
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St. Paul MN 55101

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Posted 3/14/2016

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Updated March 2018


Description

The Upper St. Anthony Falls Lock and Dam is part of the Inland Waterway Navigation System of the Upper Mississippi River Basin.  While the lock was originally authorized for navigation, Section 2010 of the Water Resources Reform and Development Act of 2014 directed the Secretary of the Army to close the Upper St. Anthony Falls lock to navigation traffic. The lock was closed June 10, 2015

A Tainter gate was installed at the upstream end of the Upper St. Anthony Falls lock chamber. The Tainter gate provides redundancy for the upstream miter gates, and, importantly, it also allows flows to be passed through the lock chamber during flood events. The Water Resources Reform and Development Act of 2014 explicitly states that the project is still authorized to conduct emergency lock operations necessary to mitigate flood damage. Historically, the Tainter gate has been operated to pass flood flows six times since 1965.  The lock will only be operated to pass flood flows.

Background

The Tainter gate’s electrical control system has not been upgraded for many decades.  Attempts to operate the gate have failed on various occasions, and reliability is a concern.  There is also a question over the condition of the system’s hydraulics, because the ram cylinder rooms and operating machinery rooms are constantly wet.  The lower parts of the cylinders and hydraulic piping are usually underwater. 

Purpose

The purpose of the rehabilitation of Upper St. Anthony Falls Tainter gate is to replace the existing operating equipment with a system that is reliable, easy to use and resistant to damage from water infiltration in the galleries. One of our goals is reduced long-term maintenance because of our reduced staffing levels after closure.

Status

A contract for this rehabilitation work was awarded in September 2017.  Work is expected to begin in May 2018, with the contract to be completed by November 2019.  Funding for the project has been received.

Authority

The Mississippi River 9-foot channel was authorized as part of the River and Harbor Act, approved July 3, 1930.

Construction of the locks at Upper and Lower St. Anthony Falls was authorized by the Rivers and Harbors Act of 1937, which approved extension of the 9-foot channel to the Minneapolis upper harbor.

Fiscal

Estimated total project cost:  $5.6 million.

flood risk management flood risk reduction Mississippi River St. Paul District Tainter gate rehabilitation U.S. Army Corps of Engineers Upper St. Anthony Falls Lock and Dam USAF