. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. Kaskaskja River Watershed 81 CHAPTER TEN Kaskaskia River Watershed At million acres, this is the largest watershed in Illinois as well as the most diverse in land cover It is the only watershed to have 10% or more of the statewide acreage of each land cover type. It is the second most urbanized water- shed and also has the second most acres of bottomland forest. (See page 109 for a color map of the watershed's
. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. Kaskaskja River Watershed 81 CHAPTER TEN Kaskaskia River Watershed At million acres, this is the largest watershed in Illinois as well as the most diverse in land cover It is the only watershed to have 10% or more of the statewide acreage of each land cover type. It is the second most urbanized water- shed and also has the second most acres of bottomland forest. (See page 109 for a color map of the watershed's land coven) Three Resource Rich Areas lie within the borders of this watershed — the Kaskaskia Bottoms, Karst/Cave Area, and Southern Till Plain. • A complex of interconnected flood plain forests, wetlands and flatwoods char- acterize the Kaskaskia bottomlands. Large, contiguous forest stands are rare in Illinois, and the largest tract in the state is located here. Tlie Karst/Cave Area RRA includes Mississippi bottomlands and part of the Ozark plateau. Exceptional fea- tures are its limestone bedrock, numerous caves and sinklioles, old growth forest, and imique flora and fauna. • Most (88%) of the Southern TiU Plain RRA lies within the Little Wabash River watershed, but the western arm comprising 12% of the area lies in the Kaskaskia River watershed. With 914 square miles, the Southern Till Plain is the second largest RRA. In presettlement times, the region was characterized by rolling prairies between broad woodlands following stream corridors. Today the area is largely agricultural but almost one- fifth of the RRA remains Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Office of Realty and Environmental Planning; Illinois. Natural History Survey Division; Critical Trends Assessmen
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