US Army Corps of Engineers
Rock Island District

District Projects

UMRR Program - IL, IA, MO, MN, WI - Beaver Island Habitat Rehabilitation & Enhancement Project, Pool 14

Published March 8, 2019

Contact
Regional Program Manager
(309) 794-5447
UMRR-MVR-HREPl@usace.army.mil

Location
Pool 14, Upper Mississippi River Miles 515.0-513.0, Clinton County, Iowa

Description
Beaver Island is located along the right descending bank of the UMRS in the southern portion of Clinton County, Iowa. Lock and Dam 13 is located 5 miles upstream of the island system. The Project lands, part of the UMR National Wildlife and Fish Refuge, are federally-owned. 

The Project area is comprised of 1,678 acres of interconnected backwaters, secondary channels, wetlands and floodplain habitat.  

The goals are to restore and protect aquatic, wetland, and floodplain forest habitats.  The objectives identified to meet these goals are (1) increase year-around aquatic habitat diversity and native fish use of spawning, rearing and overwintering habitat; (2) diversify floodplain forest habitat; (3) increase structure and function of side channel habitat.

Project Features:
· Excavate channels in backwater areas
· Construct elevated berms using excavated channel material
· Plant hard mast producing trees on the elevated berms
· Use timber stand improvement techniques
· Place a rock closure structure on the island’s upstream end
· Construct a chevron, place bank protection, and provide mussel substrate at Albany Island

The Recommended Plan would restore backwater habitat by excavating backwater channels to a depth of 8 feet or more below flat pool to provide overwinter and year-around habitat for fish. Excavated material will be used to construct land berms to enhance topographic diversity.  The land berms will be planted with native floodplain forest vegetation and trees. Other timber stand improvement actions will also occur such as tree release, girdling and interspersed tree plantings.  A rock closure structure will be constructed at the entrance to Upper Cut on Beaver Island’s upstream end to reduce overwintering water velocities and sediment deposition.

Background
Human activity, such as channel manipulation for navigation purposes, over the past two centuries within the UMR basin, floodplain and channel has altered the hydrology, topography and biotic communities present in the Project area.  These alterations have reduced the diversity and quality of aquatic habitat, reduced the acreage and diversity of the native floodplain forest and reduced the acreage and diversity of isolated ephemeral wetlands.  While these stressors are likely to continue, as will the decline of the quality of aquatic, wetland and floodplain habitat, this Project provides an opportunity to improve the quality and diversity of critical habitats.  

The need for the project is based on the following factors:
1. The existing aquatic habitat currently lacks adequate centrarchid overwintering habitat (i.e., depth and flow) important for year-round habitat functioning. Without action, the available overwintering habitat will continue to decrease.

2. The existing topography lacks floodplain forest diversity and a significant amount of the island is inundated during a typical flooding event. Consequently, floodplain forest regeneration, growth and survival are reduced. Without action, floodplain habitat will decrease in quality through succession to silver maple, open canopy and/or reed canary grass, which is an invasive species.

3. Albany Slough, the existing secondary channel habitat, has degrading geomorphologic features, structure, and function. Over time, Albany Island is likely to continue eroding, which would have major detrimental effects on existing mussel communities inhabiting the Albany Slough and on the fish species which serve as hosts.

Status
The feasibility report was approved in June 2017.  The Stage I construction contract was awarded December 27th 2018.

Authority
CG - Construction General

Summarized Project Costs

Estimated Federal Cost    $35,577,000
Estimated Non-Federal Cost  N/A
Estimated Total Project Cost  $35,577,000
Allocations Prior to FY 2019  $12,695,115
FY 2019 Allocation  $6,008,000
FY 2019 Total Capability  $6,008,000


Major Work Item Current Year
FY 2019:
Stage I construction contract was awarded in December 2018.  Work in 2019 will include clearing and dredging.