. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. 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, t
. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. 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 lixceplioiu/l features of the Karst/Cave Area RRA are its limestone bedrock, numerous caves and sinkholes, old growth forest, and unique flora and fauna. Table 37. Watershed Land Cover Land Cover Acres Percent of Watershed Statewide Percent^e* Upland forest 490,663 (5) Grassland 784,953 (6) Non-forested wetland 48,066 (4) Bottomland forest 162,693 (3) Water 70,486 (3) Urban/built-up 196,885 (2) Cropland 2,659,417 (6) Total acreage 4,413,165 1(M).()% (3) (3) (3) (2) (3) (2) (3) (1) * The watershed's percentage of the land cover type statewide, , of the state's ttpland forests are located in this watershed. Note: The watershed rank (1st-10th) Is shown in f> 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 Assessment Program. Spri
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