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ROCK ISLAND DISTRICT

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Peoria Lake Enhancement

Rock Island District

Illinois River, Miles 178.5 - 181, Woodford County, Illinois

Partners

  • ILDNR 

Description

Sedimentation has destroyed much of the fish and wildlife habitat value of Peoria Lake. The lake has lost approximately 68% of its original volume and the average depth has been reduced from 8.1 to 2.6 feet since 1903. The shallow depths from silt accumulation promote re-suspension of sediments, resulting in elevated turbidity levels. The soft lake bottom is not receptive to the rooting and survival of aquatic plants for waterfowl consumption and aquatic use. Sedimentation in the East River channel has also reduced the aquatic habitat of the lake.

Quick Facts

  • Approximate Acres: 2500
  • Congressional District: IL - 18
  • State(s) Covered: IL
  • Land Ownership: State of Illinois
  • Management Agency: ILDNR 

Features

  • Constructed the Barrier and Overburden Islands by mechanically dredging and stacking approximately 300,000 cubic yards of lake sediments about 1.0-mile long north-south along the westerly side of Peoria Lake.
  • Excavated a channel through the East River approximately 3,550 feet long out to the main river channel to remove an existing silt plug (to reestablish flow through the East River channel).
  • Constructed a rock closure structure at the upper end of the Barrier and Overburden Islands to help reduce the amount of sediment that enters this Barrier Island channel and Goose Lake in order to provide over-wintering fish habitat.
  • Constructed approximately 18,585 feet of low level levees, 3 water control structures, and a pump station to allow for independent water level management within the 3 cells of the Forested Wetland Management Unit (FWMA).
  • Re-vegetated dredged material placement sites by planting selected vegetation 

Milestones

  • The Definite Project Report was completed in July 1990.
  • Construction was initiated in September 1993 and completed in Septemeber 1997.
  • The Operation and Maintenance Manual was completed in May 1998.
  • The Initial Project Evaluation Report was completed in March 2001 and an additional evaluations have been completed.