. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. bottomlands are the last strongholds of the eastern deciduous forest in Illinois. The immense size of the trees (some are over 130 feet tall and six feet in diameter) and diversity- of species are remarkable features of the woods. Several state tree champions are pre- sent in Beall Woods Nature Preserve. • Most of the Southern Till Plain RRA lies within the Little Wabash River watershed, but the western arm compri
. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. bottomlands are the last strongholds of the eastern deciduous forest in Illinois. The immense size of the trees (some are over 130 feet tall and six feet in diameter) and diversity- of species are remarkable features of the woods. Several state tree champions are pre- sent in Beall Woods Nature Preserve. • Most of the Southern Till 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 the area is largely agricultural. Nevertheless, a SO-mile stretch of the Little Wabash is a Biologically Significant Stream and almost one-fifth of the area is The Little Wabash is tlje smallest of the 10 watersheds. Table 45. Watershed Land Cover Land Cover Acres Percent of Watershed Statewide Percentage* Upland forest 259,737 (6) (8) Grassland 456,555 (4) (8) Non-forested wetland 9,949 9) (9) Bottomland forest 90,652 (2) (4) Water 15,851 (9) (9) I'rban/liiiilt-up 31,979 (10) (10) Cropland 1,547,458 (8) (10) Total acreage 2,412,183 (10) * The watershed's percentage of the land cover tyipe statewide, , of the state's upland fotvsts. Note: the watershed rank (Ist-lOth) is shown in parentheses. 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
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