US Army Corps of Engineers
St. Paul District Website Website

Dredged Material Management Plan (DMMP): Pool 5

Published March 15, 2018
Updated: April 16, 2020

The purpose of the Dredged Material Management Plan (DMMP) is to prepare a coordinated long-term plan for managing dredged material from Pool 5.


The Pool 5 DMMP study area is located between Lock and Dam 4 at Alma, Wisconsin and Lock and Dam 5 near Minneiska, Minnesota spanning nearly 15 river miles from 752.8 to 738.1. The study area includes several communities near the main navigation channel including Buffalo City and Alma, Wisconsin and Minneiska and Weaver, Minnesota.


The U.S. Army Corps of Engineers operates and maintains the Upper Mississippi River 9-Foot Channel Navigation Project.

Permanent dredged material placement sites previously used in Pool 5 have nearly reached capacity. Furthermore, relying totally on existing island transfer sites cannot be considered the least cost alternative, because material placed at island transfer sites will need to be offloaded to permanent sites. Additional permanent sites are needed to accommodate dredging needs in Pool 5.

Between 1981 and 2018, the average amount of material dredged per year in Pool 5 was approximately 115,000 cubic yards.

The DMMP includes an evaluation of potentially suitable sites, which will develop into the Federal Standard or Base Plan for managing dredged material for a minimum of 20 years. The Federal Standard is defined as “the dredged material disposal alternative or alternatives identified by the Corps which represent the least costly alternatives consistent with sound engineering practices and meeting the environmental standards established by the Clean Water Act’s 404(b)(1) evaluation process…” (33 C.F.R. § 335.7).


A final plan was completed in fiscal year 2020. Real estate acquisition has begun on over 900 acres of willing seller property south of the Zumbro River straightening in Wabasha County. Future operations and implementation planning will include site design, water management and cultural resources investigations.


Congress authorized the Upper Mississippi River 9-Foot Channel Navigation Project via the Rivers and Harbors Acts of 1930 and 1932.


Expended To Date                                         $820,000