. Distribution and abundance of winter populations of bald eagles in Illinois. Bald eagle. February 1988 Havera and Kruse: Winter Populations of Bald Eagles. Fig. \vai(l \icw ol the Chautauqua Lake area, an important winter site for bald in the Lower Illinois River Re>;ion. regions (), with the exception of the Upper Mississippi River Region (). The average density of eagles per river mile () in the Lower Illinois River Region was slightly lower than the value for the Central Illinois River Region (), higher than those values for the Upper Illinois
. Distribution and abundance of winter populations of bald eagles in Illinois. Bald eagle. February 1988 Havera and Kruse: Winter Populations of Bald Eagles. Fig. \vai(l \icw ol the Chautauqua Lake area, an important winter site for bald in the Lower Illinois River Re>;ion. regions (), with the exception of the Upper Mississippi River Region (). The average density of eagles per river mile () in the Lower Illinois River Region was slightly lower than the value for the Central Illinois River Region (), higher than those values for the Upper Illinois (), Lower Mississippi (), and the Upper and Lower Central Mississippi regions ( and , respectively), but substantially lower than the value () for the Upper Mississippi River Region. Central and Southern Lakes Region. A vast majority of bald eagles wintering in Illinois was found in the floodplains of the Illinois and Mississippi rivers (Figs. 6 and 26). Relatively small numbers of eagles were counted in other regions. Of the nine reservoirs and cooling lakes censused in central and southern Illinois (Fig. 6, Appendix), five (Sangchris, Carlyle, Rend, Baldwin, and Springfield) were inventoried on a reg- ular basis from October through April since 1972. However, only Carlyle and Rend lakes averaged more than one eagle per census (Fig. 26, Appendix). No eagles were sighted at Clinton Lake. Kagje use of these lakes in central and southern Illinois declined in recent years. Northeast Lakes Region. The natural lakes, reser- voirs, and cooling lakes in counties of northeastern Illinois (Fig. 6, Appendix) alsf) hosted few eagles. These lakes were censused from September through April since 1976. Lhe M( Henry Dam area in Mc Henry County was the only area that held an average of tnore than one eagle per census (Pig. 26, Appendix). Kaglc numbers were slighilv higher in the late 1970s in this region, but fell to near zero iti later years. Surffiir-wnirrI Litkc^ Rtgiini
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