community includes wetlands and deepwater habitats with all the following
characteristics: 1. Situated in a topographic depression or a dammed river
channel; 2. Lacking trees, shrubs, persistent emergents, emergent mosses,
or lichens with greater than 30% areal coverage; and, 3. Total area exceeds
20 acres (8 hectares). Some areas less than 20 acres may be included if
the depth is greater than 6.6 feet (2 meters) at low water, or if an active
wave-formed or bedrock shoreline makes up all or part of the boundary.
In general, this wetland type includes all permanently flooded, natural or artificial lakes and reservoirs. Typically, there are extensive areas of deep water with moderate to considerable wave action. Vegetation is limited to the shallow edges from shore to a depth of approximately 2 meters.
The soils in this community consist of silty, loamy, and clayey materials in man-made lakes, and loamy materials in antural lakes. Reaction of the materials ranges from strongly acid to moderately alkaline. Some major soils inundated by construction of lakes in southern Illinois include Belknap silt loam and Bonnie silt loam on floodplains, and Hickory loam on side slopes.
In central and northern Illinois, the major soils include Lawson silt loam and Sawmill silty clay loam on floodplains, and Hennepin loam on the side slopes. Soils on the bottom of natural lakes are not named.
*Used throughout the community descriptions to indicate the most commonly occurring code in Illinois