Pool 2 Wing Dam Modification Project, Upper Mississippi River Pool 2, Minnesota

U.S. Army Corps of Engineers, St. Paul District
Published Nov. 24, 2020
Updated: March 29, 2022

To notch a series of wing dams throughout Pool 2 in order to improve main channel border habitat for fishes. Wing dam notching will enable downstream scouring, which creates overwintering habitat.


The project area is in the middle and lower half of Pool 2, Upper Mississippi River, downstream of St. Paul, Minnesota; spanning Dakota, Ramsey and Washington counties, Minnesota.


In 2009, through the Navigation and Ecosystem Sustainability Program (NESP) authority, a Project Implementation Report (PIR) for the Pool 2 Wing Dam Modification Project was completed. The PIR established ecosystem restoration goals and specific performance measure indicators; specified the without-project condition or baseline for each performance measure indicator; and, for each separable element of the ecosystem restoration, identified specific target goals for each performance indicator.

The recommended plan as identified in the PIR includes notching 30 wing dams to improve channel border habitat for fish; 23 wing dams were proposed to have a single notch, and seven wing dams were proposed to have a double notch. The project delivery team (PDT) evaluated the 30 wing dams identified in the PIR and determined that 23 wing dams could be notched to provide habitat benefit without negatively impacting the Corps’ Navigation Mission; 17 wing dams will have a single notch, six wing dams will have a double notch.


An economic update for NESP was completed in fiscal year 2019. Pre-Construction Engineering and Design (PED) activities advanced throughout fiscal year 2020 with $4,500,000 in investigation funds. PED activities continued in fiscal year 2021 with an additional $5,000,000 in investigation funds allocated through the work plan. The PDT estimates that plans and specifications for the Pool 2 project will be finalized by the end of fiscal year 2021.

Construction will likely be completed in house utilizing the U.S. Army Corps of Engineers’ Maintenance and Repair Crew at an estimated cost of $180,000. The project is anticipated to be construction ready to complete work in fiscal year 2022 if funding is available.


NESP was authorized in the Water Resources Development Act of 2007 (Title VIII) to construct small-scale navigation improvements (mooring cells and switchboats), seven new 1200-foot lock chambers and ecosystem/habitat restoration.


Project Costs to Date                                       $150,000

Estimated Total Project Cost                          $340,000