US Army Corps of Engineers
St. Paul District

Projects

Dredged Material Management Plan (DMMP): Pool 5

Published March 15, 2018
Updated: March 21, 2019
Location

The Pool 5 Dredged Material Management Plan (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.

Description

The U.S. Army Corps of Engineers operates and maintains the Upper Mississippi River 9-Foot Navigation Channel Project.  The purpose of the DMMP is to prepare a coordinated long-term plan for managing dredged material from Lower Pool 5.

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).

Status

In fiscal year 2018, the Corps began identifying the Tentatively Selected Plan (TSP) for the Pool 5 DMMP that will be the least costly, operationally feasible and environmentally acceptable, implementable alternative.

In late fiscal year 2019, the Corps will release a draft report with the TSP sites identified for a public review period and hold a public meeting to present the plan and receive feedback. 

A final plan and subsequent real estate acquisition are anticipated to begin late in fiscal year 2019 and will be phased over time, pending prioritization of parcels and availability of funds.

Authority

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