US Army Corps of Engineers
St. Paul District Website


Disposition Study, Lower St. Anthony Falls Lock and Dam, and Lock and Dam 1, Upper Mississippi

Published March 22, 2019
Updated: Sept. 20, 2019

A Section 216 study will investigate the appropriate future disposition of Lower St. Anthony Falls (LSAF) Lock and Dam and Lock and Dam 1, located on the Mississippi River in Minneapolis, Minnesota.


The LSAF Lock and Dam was constructed as part of the Minneapolis Upper Harbor project in 1956 as authorized by the Rivers and Harbors Act of 1937. Lock and Dam 1 was originally constructed in 1917 and was modified in 1932 under the authority of the River and Harbor Act of 1930. The U.S. Army Corps of Engineers operates and maintains the two sites.

Both locks have been affected by the decrease in the demand for navigation services stemming from the closure of Upper St. Anthony Falls Lock and Dam on June 9, 2015. A disposition study for the two projects will begin in late 2020 or early 2021 and will examine the benefits and costs of the Corps continuing to operate and maintain them.

As per Section 1168 of America’s Water Infrastructure Act of 2018, in addition to considering no action (in which the Corps continues to operate and maintain the projects) and full deauthorization and disposal of the projects in an as-is condition, the study must consider full or partial removal of the dam at each site as an alternative. An environmental assessment or environmental impact statement will be prepared in compliance with the National Environmental Policy Act.


The disposition study for Lower St. Anthony Falls Lock and Dam and Lock and Dam 1 will commence in December 2020. The Corps will hold meetings with the public, resource agencies and non-governmental agencies in early 2021. A draft report will be available for public comment in spring 2022. The study is scheduled to be complete in spring 2023.

Federal property disposal is managed by the General Services Administration as governed by federal law. If disposal of the properties is not recommended, additional studies may be performed to modify the projects to serve existing or new authorized purposes or for additional uses identified by a potential non-federal sponsor and authorized under a new start feasibility study.


Section 216 of the Flood Control Act of 1970 allows the Corps to study completed projects or their operation when found advisable due to significantly changed physical or economic conditions.


The cost of the study is $1.3 million funded under the investigation appropriation.