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ROCK ISLAND DISTRICT

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Godar and Glades Wetland Complex Habitat Restoration

St. Louis District

Illinois River, Miles 12-31, Jersey and Calhoun Counties, Illinois

Partners

  • Illinois Department of Natural Resources 

Description

The proposed project includes Godar Management Area, Glades Management Area, Diamond Island, Hurricane Island, Crater Island, Willow Island, Twelve Mile Island, Helmbold Island, and Mortland Island. Godar Management Area is part of a leveed floodplain on the right descending bank of the lower Illinois River. Glades Management Area is part of an un-leveed floodplain on the left descending bank of the lower Illinois River. Helmbold Island was an isolated island in 1940, but has since merged with the mainland on the right descending bank. Diamond, Hurricane, Crater, Willow Islands, Twelve Mile, and Mortland Islands are independent from the mainland, located in the river channel. These sites are General Plan lands owned by the US Army Corps of Engineers and are managed by the Illinois Department of Natural Resources through a cooperative agreement with the US Fish and Wildlife Service.

The Upper Mississippi River Habitat Needs Assessment (2000) has identified the need for restoring the depth and connectivity of backwaters on the lower Illinois River and improved water management that mimics historic natural river elevations. Backwater habitat on the lower Illinois River has been degraded due to sedimentation and substrate suspension, reducing the quantity and quality of submersed aquatic vegetation and fishery habitat. Current water level management tries to mimic natural river conditions during the summer by drawing down the backwaters and allowing the sediments to consolidate, increasing backwater depth and reducing sediment suspension. However, current drainage systems, low berms and pumps do not facilitate efficient water fluctuations.

The primary goals of this proposed project are to enhance backwater and side channel habitat to benefit fisheries, shorebirds, and migratory waterfowl; and to enhance floodplain forest and submersed aquatic vegetation communities.

Quick Facts

  • Approximate Acres: 5044
  • Congressional District: IL - 13
  • State(s) Covered: IL
  • Land Ownership: U.S. Army Corps of Engineers
  • Management Agency: ILDNR
  • Management Authority: Cooperative Agreement 

Proposed Potential Features

  • Construction of low elevation berms to create separate management units and reduce river-borne sedimentation
  • Water Control Structures
  • Excavation of backwater areas
  • Dredging of side channel
  • Water control structures
  • Pump Station
  • Tree planting
  • Excavation of backwater ares

Milestones

  • The Fact Sheet Approved, September 2010
  • The project is currently deferred