. Mississippi River Region was censused for just 3 years (1980-1983). and only the Kaskaskia River Region had fewer inventories. Values for the estimated density of bald eagles per river mile and per square mile of wetlands, respec- tively, for the inventory regions of the Mississippi and Illinois rivers were Upper Mississippi, and ; Upper Central Mississippi, and ; Lower Cen- tral Mississippi, and ; Lower Mississippi, and ; Upper Illinois, and ; Central Il- linois, and ; and Lower Illinois, and Fewer bald eagles were observed in
. Mississippi River Region was censused for just 3 years (1980-1983). and only the Kaskaskia River Region had fewer inventories. Values for the estimated density of bald eagles per river mile and per square mile of wetlands, respec- tively, for the inventory regions of the Mississippi and Illinois rivers were Upper Mississippi, and ; Upper Central Mississippi, and ; Lower Cen- tral Mississippi, and ; Lower Mississippi, and ; Upper Illinois, and ; Central Il- linois, and ; and Lower Illinois, and Fewer bald eagles were observed in the Surface- mined Lakes Region in west-central Illinois, the Northeast Lakes Region, the Central and Southern Lakes Region, and the Lower Kaskaskia River Region. Intensified enforcement of laws protecting bald eagles, the protection and management of habitats identified as feeding, roosting, and major eagle use areas, and the reduction of the availability of lead shot to eagles should result in an increase in the number of bald eagles that winter in Illinois. ACKNOWLEDGEMENTS We gratefully acknowledge the help of H. Kath- leen Belcher and Michelle M. Georgi in data tabulation and the contribution of Frank C. Bellrose and Robert D. Crompton, who conducted the aerial censuses of eagles. Funds for airplane rental were provided by the Illinois Department of Conservation; Army Corps of Engineers, St. Louis District; Illinois Power Company; Commonwealth Fdison; and Central Il- linois Public Service Company. Tabulation and analysis of some of the data and preparation of this report were supported in part by the Environmental Research Program of the Department of Energy and Natural Resources under C'ontrad Nos. EH-27 and EH-2, and we thank Elizabeth Johnson and Linda Vogt for their support. We also thank Dr. Glen C. Sanderson, Head of the Section of Wildlife Research; Drs. Richard and Jean Graber, and Dr. Christopher D. Burnett of the Illinois Natural History Survey; Dr. David L
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