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Title: Upper Mississippi River System Environmental Management Program Definite Project Report (SL-4) with Integrated Environmental Assessment : Stump Lake Complex Habitat Rehabilitation and Enhancement Project, Pool 26, Illinois River, Jersey County, Illinois
Authors: United States. Army. Corps of Engineers. St. Louis District.
Keywords: Restoration ecology
Environmental protection
Environmental management
Illinois River (Ill.)
Publisher: United States. Army. Corps of Engineers. St. Louis District.
Abstract: The Stump Lake complex extends from Illinois River mile 7.2 to mile 12.7 along the left bank of the Illinois River in Jersey County, Illinois. This 2,958 acre area includes Upper and Lower Stump Lakes, Fowler Lake, Flat Lake, Long Lake and Deep Lake and contains 1,221 acres of open wetlands and sloughs, 252 acres of cropland and 1,485 acres of forest. The complex floodplain is relatively flat with elevations form 420.0 to 425.0 NGVD. The Illinois River normal pool elevation is 419.0 NGVD. Located on federal lands acquired in the 1930's for Navigation Pool 26, the Stump Lake Complex has been managed by the Illinois Department of Conservation since the 1950's under a general plan and cooperative agreement with the U.S. Fish and Wildlife Service and the Corps of Engineers. The complex wetlands are managed primarily for migratory waterfowl habitat. Moist soil and aquatic vegetation management techniques are employed by manipulating water levels of the five open wetland units in the complex. Primary problems facing the Stump Lake Complex are sedimentation and water level fluctuation. The sedimentation rate is averaging .5 inches per year at the complex. Sedimentation results in a direct loss of wetland habitat for both waterfowl and fish due to the water-to-land conversion process and causes a decline in the quality of the remaining fishery habitat due to shallower water levels which allow higher temperatures and reduced dissolved oxygen concentrations during the summer months. In addition, many management efforts are lost. Silt and lack of stable water levels are deleterious to aquatic and moist soil plant production. Moist soil techniques require 50 to 90 days for development and maturity of food plants. Inefficient and aging water levels control structures and lack of protection from Illinois River waters at bank full and above stages allow for successful wildlife food production only 50% of the time on the average. The plan formulation process involved developing and evaluating alternatives to correct the sedimentation and water control problems at the Stump Lake Complex. Three alternatives were evaluated. They are: Alternative A, No Federal Action, Alternative B, Wetlands Excavation, and Alternative C, Wetlands Protection System. Alternative C was the selected alternative.
Description: Definite Project Report with Integrated Environmental Assessment
Rights: Approved for Public Release; Distribution is Unlimited
Size: 376 pages / 24.77 MB
Types of Materials: PDF/A
Appears in Collections:Environmental Documents

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