Beneficial Use of Dredged Material: Section 1122, Upper Pool 4 – Lake Pepin, Bay City, Wisconsin

U.S. Army Corps of Engineers, St. Paul District
Published Sept. 16, 2016
Updated: March 17, 2022
Purpose

This project proposes to utilize dredged material generated from navigation channel dredging to protect and restore backwater habitat; this is a win-win-win project for the U.S. Army Corps of Engineers, our partner agencies and the environment. The Wisconsin Department of Natural Resources (WDNR) is the non-federal sponsor.

Location

The project area is located near the head of Lake Pepin in Upper Pool 4 of the Mississippi River, between river mile 780 and 792 in the backwater complexes adjacent to the main channel. The nearest community is Bay City, Wisconsin.

Description

Sedimentation and sediment resuspension caused a loss in water depth diversity of the backwater lakes and isolated wetlands above Lake Pepin as well as a loss in aquatic vegetation. Concerns over habitat deficiencies in Upper Pool 4 include reduced habitat diversity and quality, lack of aquatic vegetation and invertebrates, and reduced abundance of fish and wildlife.

The project will utilize dredged material generated from navigation channel dredging in Lower Pool 4 to improve the ecosystem at the head of Lake Pepin. The operations and maintenance (O&M) program will pay up to the typical cost of dredged material disposal (100% federal) for any dredged material used.

The project includes four peninsulas, two backwater overwintering areas, access dredging, shoreline protection and a water level management dike that would create a range of habitat types for fish and wildlife.

Status

The Lake Pepin Legacy Alliance requested a feasibility study in December 2015. This feasibility study was initiated in 2017 and completed in August 2020. The Corps and WDNR are currently finalizing the project partnership agreement in August 2021. The Corps is currently completing final design of the project and expected construction contract award later in 2022.

Authority

This project was initiated under Section 204 of the Water Resources Development Act of 1992, as amended. This project was selected under Section 1122 of the Water Resources Development Act of 2016, which required the Corps to establish a pilot program to recommend ten projects for the beneficial use of dredged material.

Funding

The design and implementation phases of the project will be cost shared using funding from O&M, Section 1122 and the WDNR.

Estimated project costs:

Feasibility 204 funds (100%)                            $938,420

Federal O&M funds (100%)                           $9,244,000

Federal CG funds (65%)                                  $8,997,000

Non-federal funds (35%)                                $4,844,000

Total Project Costs                                        $24,023,420