. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. rare and limited in distribution to this area of the state. This RRA encompasses the Mississippi River bottomlands, Ozark plateau, and unglaciated hill country. The Illinois Ozarks RRA shares a boundary with the Cache River RRA. • The Cache River RRA is located at the southern tip of Illinois; it covers 693 square miles. The upper reach flows through the hills of the Ozark plateau: the lower Cache flows through fl
. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. rare and limited in distribution to this area of the state. This RRA encompasses the Mississippi River bottomlands, Ozark plateau, and unglaciated hill country. The Illinois Ozarks RRA shares a boundary with the Cache River RRA. • The Cache River RRA is located at the southern tip of Illinois; it covers 693 square miles. The upper reach flows through the hills of the Ozark plateau: the lower Cache flows through flatter coastal plains where drainage is slow and wet- lands become more abundant. Unique features include bald cypress- tupelo gum swamps and several species associated with the southern The Shawnee Hills RRA, covering 745 square miles, is a scenic wooded area in an unglaciated part of the state. An escarpment of sandstone nms east to west in this area. Bluffs, rugged hills, deep ravines, and clear streams support distinctive flora and fauna. Table 48. Watershed Ixtncl Cover Land Cover Acres Percent of Watershed Statewide Percentage* Upland forest Grassland Non-forested wetland Bottomland forest Water UrbanA)uilt-up Cropland Total acreage 991,770 924,376 50,302 227,037 101,734 84,037 1,350,312 3,729,571 (1) (2) (2) (1) (1) (8) (9) (1) (2) (2) (1) (1) (7) (8) (5). 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. Springfield, Ill. : Office of Realty and Environmental Planning : Illinois Natural History Survey
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