. Distribution and abundance of winter populations of bald eagles in Illinois. Bald eagle. birds ranged from to on individual census flights. The mean count per inventory on individual cen- sus areas is shown in Figure 9. The area between the Wapsipinicon River and Princeton was the most heav- ily used in this region, with an average of eagles sighted per inventory (Appendix). Other heavily used areas were the Bellevue to Green Island segment and the Fulton to Albany area. The Upper Mississippi River Region also includes the Oak Valley Ref- uge in Rock Island Clounty. T
. Distribution and abundance of winter populations of bald eagles in Illinois. Bald eagle. birds ranged from to on individual census flights. The mean count per inventory on individual cen- sus areas is shown in Figure 9. The area between the Wapsipinicon River and Princeton was the most heav- ily used in this region, with an average of eagles sighted per inventory (Appendix). Other heavily used areas were the Bellevue to Green Island segment and the Fulton to Albany area. The Upper Mississippi River Region also includes the Oak Valley Ref- uge in Rock Island Clounty. The heavy use of this area by wintering bald eagles was documented by Klton Fawks through 25 years of observation and because of its importance, the refuge was purchased by the Illinois Department of Conservation (IDOC) in 1980. For the Upper Mississippi River Region as a whole, bald eagles occurred at an average density of eagles per river mile or eagle per square mile of wetland habitat from 1980-1983. These values are higher than those for any other region of the Missis- sippi and Illinois rivers; however, the Upper Missis- sippi River Region has been flown for fewer years than the other regions (Table 4, Fig. 6). Upper Central Mississippi River Region. The Upper Central Mississippi River Region stretches from ap- proximately Rock Island, Illinois, to Keokuk, Iowa (Fig. 6). Between 1972 and 1986, most areas within this region were surveyed from 120 to 130 times. Flights were made from September through De- cember in 1972 to 1985, during Januarv from 1973 to 1986, and from February through .April from 1980 to 1985. Lodi and Dam 16 15 29 12 26. lig. iiuinlur oi bald eagles (oiiiiliil |>< i Ippcr Mississipi Rivir Region. HIHO-HW:! luiinherof halrleagleMoiinteii pel areas KJlhiii ihe I'ppei Mississippi Rlvei Regiriii. :V. Please note that these images are extracted from scanned page images that may have been digita
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