Summary of 53 Years of Midwinter Bald Eagle Counts

% immatures 5 year  10 Year  52 Year 
  Year    Adults Subadult Immatures Unknown   Total of Known Age Average Average Average 
1961 470 111 40 621 19.1%
1962 417 59 29 505 12.4%
1963 416 102 7 525 19.7%
1964 294 61 130 485 17.2%
1965 580 191 97 868 24.8% 19.4%
1966 586 156 58 800 21.0% 19.9%
1967 590 188 28 806 24.2% 22.1%
1968 444 177 50 671 28.5% 23.7%
1969 511 292 3 806 36.4% 27.0%
1970 543 254 32 829 31.9% 28.5% 24.7%
1971 564 225 12 801 28.5% 30.0% 25.6%
1972 817 377 46 1240 31.6% 31.5% 27.5%
1973 663 279 22 964 29.6% 31.5% 28.2%
1974 592 176 8 776 22.9% 29.2% 28.2%
1975 751 346 34 1131 31.5% 29.3% 29.0%
1976 729 296 63 1088 28.9% 29.3% 29.6%
1977 590 205 25 820 25.8% 28.1% 29.7%
1978 977 416 53 1446 29.9% 28.3% 29.8%
1979 1257 568 41 1866 31.1% 29.8% 29.6%
1980 1170 580 57 1807 33.1% 30.4% 30.0%
1981 527 237 61 825 31.0% 30.7% 30.1%
1982 647 226 60 933 25.9% 30.7% 29.6%
1983 379 128 1 508 25.2% 30.4% 29.4%
*1984 705 146 42 893 17.2% 27.8% 28.9%
*1985 600 104 26 730 14.8% 22.7% 27.7%
1986 629 386 54 1069 38.0% 25.1% 28.6%
1987 658 263 38 959 28.6% 25.7% 28.8%
1988 563 328 66 957 36.8% 28.0% 29.4%
1989 169 122 2 293 41.9% 31.5% 29.4%
1990 921 311 28 1260 25.2% 32.4% 28.0%
1991 962 315 132 1409 24.7% 29.0% 27.2%
1992 796 5 353 12 1166 31.0% 29.6% 27.8%
1993 1995 13 674 26 2708 25.6% 27.0% 27.4%
1994 1801 1 618 113 2533 25.6% 26.1% 27.8%
1995 1230 9 429 16 1684 26.3% 26.3% 28.2%
1996 1369 0 574 21 1964 29.5% 27.1% 27.7%
1997 2720 38 927 46 3731 26.2% 26.5% 27.4%
1998 1063 4 522 8 1597 33.1% 27.6% 27.4%
1999 1237 26 569 81 1913 32.5% 28.9% 27.7%
2000 949 14 591 14 1568 38.9% 30.8% 28.7%
2001 2010 9 1062 20 3101 34.8% 32.0% 29.8%
2002 1653 27 764 67 2511 32.4% 34.2% 30.0%
2003 2277 89 733 60 3159 26.5% 32.3% 30.0%
2004 2731 157 924 159 3971 28.4% 31.2% 30.2%
2005 1181 61 324 72 1638 24.6% 29.6% 30.1%
2006 1299 42 350 34 1725 23.2% 27.5% 29.7%
2007 3033 88 656 47 3824 19.7% 24.6% 28.7%
2008 3018 96 837 101 4052 23.6% 23.9% 27.7%
2009 2192 97 491 50 2830 21.2% 22.1% 26.7%
2010 1134 56 304 73 1567 24.1% 22.0% 25.9%
2011 1317 72 620 33 2042 34.4% 23.7% 25.5%
2012 1381 69 419 103 1972 26.1% 25.3% 24.9%
2013 2972 45 763 127 3907 21.4% 24.6% 24.2% 27.3%
Average 1114.7 19.2 398.7 49.6 1582.2 27.3%
Notes:
* Counts not complete for 1984 and 1985
Sub-adults were not counted in their own category prior to 1992
The 5, 10 and 52 year averages are the percentage of immature eagles to adult and sub-adult eagles.
  The average is for the years prior. For example, the 5 year average on the 1980 line is for 1976 through 1980.