2015 Mid-winter Bald Eagle Counts
| Compared | % Immatures | Change in | ||||||
| Location | Adult | Sub-Adult | Immature | Unknown | Total | to 2014 | of known age | percentage |
| St. Croix River | ||||||||
| In Wisconsin | 8 | 4 | 4 | 0 | 16 | 1 | 50.0% | 16.7% |
| Wisconsin River | ||||||||
| Pettenwell to Ferry Bluff | 21 | 1 | 16 | 1 | 39 | -19 | 44.7% | 43.3% |
| South of Ferry Bluff | 6 | 0 | 2 | 0 | 8 | -34 | 25.0% | -8.3% |
| Wisconsin River Subtotal | 27 | 1 | 18 | 1 | 47 | -52 | 41.3% | 14.0% |
| Rock River/Pecatonica | 57 | 3 | 37 | 22 | 119 | -181 | 41.2% | 8.8% |
| Illinois River | ||||||||
| Hennepin & North | 17 | 2 | 8 | 5 | 32 | -4 | 37.0% | 17.0% |
| Henry | 0 | 0 | 0 | 0 | 0 | 0 | -- | 0.0% |
| South to Peoria | 141 | 2 | 38 | 181 | 102 | 22.1% | -6.1% | |
| Peoria to Havana | 169 | 8 | 83 | 2 | 262 | 102 | 35.0% | 10.2% |
| Havana to Beardstown | 0 | 0 | 0 | 0 | 0 | -19 | -- | 100.0% |
| South to Grafton | 13 | 0 | 1 | 1 | 15 | -21 | 7.1% | -9.6% |
| Illinois River Subtotal | 340 | 12 | 130 | 8 | 490 | 146 | 29.5% | 6.2% |
| Mississippi River | ||||||||
| Lock & Dam # 2 & 3 | 8 | 3 | 5 | 2 | 18 | -5 | 50.0% | 11.9% |
| Lock & Dam # 4 & 5 | 28 | 1 | 1 | 0 | 30 | 0 | 6.7% | -29.0% |
| Lock & Dam # 5A & 6 | 4 | 0 | 1 | 0 | 5 | -3 | 20.0% | -20.0% |
| Lock & Dam # 7 & 8 | 0 | 0 | 0 | 0 | 0 | -8 | -- | 100.0% |
| Lock & Dam # 9 & 10 | 19 | 0 | 2 | 1 | 22 | 22 | 9.5% | 9.5% |
| Inland | 20 | 0 | 2 | 0 | 22 | 19 | 9.1% | 9.1% |
| Lock & Dam # 11 & 12 | 11 | 2 | 2 | 0 | 15 | -33 | 26.7% | 4.6% |
| Sav. Army Depot & Iowa | 28 | 3 | 11 | 1 | 43 | 6 | 33.3% | 2.0% |
| Lock & Dam # 13 | 25 | 0 | 1 | 0 | 26 | -298 | 3.8% | -13.8% |
| Lock & Dam # 14 | 18 | 4 | 11 | 0 | 33 | -101 | 45.5% | 12.6% |
| Lock & Dam #15 | 50 | 2 | 20 | 0 | 72 | -3 | 30.6% | -22.1% |
| Lock & Dam #16 | 16 | 4 | 3 | 16 | 39 | -140 | 30.4% | 4.3% |
| Lock & Dam # 17 | 6 | 0 | 2 | 0 | 8 | -373 | 25.0% | 13.5% |
| Inland | 16 | 6 | 2 | 0 | 24 | -66 | 33.3% | 12.2% |
| Lock & Dam # 18 | 56 | 4 | 16 | 4 | 80 | -287 | 26.3% | 7.5% |
| Lock & Dam # 19 | 20 | 0 | 4 | 1 | 25 | -69 | 16.7% | -13.0% |
| Lock & Dam # 20 | 3 | 0 | 0 | 4 | 7 | -165 | 0.0% | -57.8% |
| Lock & Dam # 21 & 22 | 4 | 0 | 4 | 2 | 10 | -42 | 50.0% | 33.9% |
| Lock & Dam # 24 & 25 | 7 | 0 | 0 | 0 | 7 | -17 | 0.0% | -25.0% |
| St. Louis and South | 137 | 1 | 43 | 4 | 185 | 81 | 24.3% | -4.1% |
| Miss. River Subtotal | 476 | 30 | 130 | 35 | 671 | -2299 | 25.2% | 0.5% |
| Tennessee | no results | |||||||
| Kentucky | no results | |||||||
| Missouri River | no results | |||||||
| Louisiana | no results | |||||||
| 2015 Grand Totals | 908 | 50 | 319 | 66 | 1343 | -2385 | 28.9% | 3.6% |
| 2014 Grand Totals | 2700 | 180 | 733 | 115 | 3728 | -179 | 25.3% | 3.9% |
| 2013 Grand Totals | 2972 | 45 | 763 | 127 | 3907 | 1935 | 21.4% | -4.7% |
| 2012 Grand Totals | 1381 | 69 | 419 | 103 | 1972 | -70 | 26.1% | -8.2% |
| 2011 Grand Totals | 1317 | 72 | 620 | 33 | 2042 | 475 | 34.4% | 10.3 |
| 2010 Grand Totals | 1134 | 56 | 304 | 73 | 1567 | -1263 | 24.1% | 2.9% |
| 2009 Grand Totals | 2192 | 97 | 491 | 50 | 2830 | -1222 | 21.2% | -2.4% |