. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. ravines, shallow depressions, broad uplands and the stream valley. • Tlie Des Plaines Ri\er RRA is a small — 68 square miles — highh urbanized site which forms a narrow corridor along the river from just west of Chicago to Joliet. Relatively high percentages of upland woods and non-tbrcsted wetlands occur at this site. Important natural features include prairie, savanna, river bluffs, cliffs, wetland, floodplain a
. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. ravines, shallow depressions, broad uplands and the stream valley. • Tlie Des Plaines Ri\er RRA is a small — 68 square miles — highh urbanized site which forms a narrow corridor along the river from just west of Chicago to Joliet. Relatively high percentages of upland woods and non-tbrcsted wetlands occur at this site. Important natural features include prairie, savanna, river bluffs, cliffs, wetland, floodplain and upland forest. • The DuPage River RRA, com- prised of the watershed of the East Branch of the Du Page River, is located in the highh' urbanized western sub- urbs of Chicago. With its small size (81 square miles) it has a high percentage of upland forest (19%) and non-forested wet- lands (3%). The Chain O'Lakcs-Fox River RR/K (44"^ square miles) encompasses the area of most recent glaciation in Illinois. Significant natural features include glacial landforms, natural lakes, and Table 18. Watershed Land Comr Land Cover Acres Percent of Watershed Statewide Percentage* Upland forest 290,149 (4) (7) Gra,ssland 326,288 (8) (10) Non-forested wetlands 78,237 (1) (1) Bottomland forest 26,448 (9) (10) Water 36,275 (5) (7) llrban/liuilt-up 931,664 (1) (1) Cropland 877,925 (10) (10) Total acreage ,987 (9). The watershed has the most non-forested wetland acres in the state as well as the hiji}}est percenta{>e of wetland in a watershed. * The watershed's percentafie of the land coi'er t}'/)e statewide, , 7% of the states upland forests are located in this watershed. Note: the watershed's rank (IstlOth) is shoiiii in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance
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Keywords: ., bookauthorillinoisnaturalhistorysurveydivisi, booksubjectnature
