2013 Mid-winter Bald Eagle Counts
| Compared | % Immatures | Change in | ||||||
| Location | Adult | Sub-Adult | Immature | Unknown | Total | to 2012 | of known age | percentage |
| St. Croix River | ||||||||
| In Wisconsin | 14 | 2 | 16 | 16 | 12.5% | -- | ||
| Wisconsin River | ||||||||
| Pettenwell to Ferry Bluff | 12 | 6 | 1 | 19 | 44 | 33.3% | -8.6% | |
| South of Ferry Bluff | 144 | 85 | 29 | 258 | 215 | 37.1% | -2.9% | |
| Wisconsin River Subtotal | 156 | 0 | 91 | 30 | 277 | 171 | 36.8% | -4.5% |
| Rock River/Pecatonica | 67 | 1 | 27 | 6 | 101 | 2 | 29.5% | -16.0% |
| Illinois River | ||||||||
| Hennepin & North | 8 | 2 | 10 | -42 | 20.0% | 12.3% | ||
| Henry | 20 | 2 | 22 | 6 | 9.1% | 22.2% | ||
| South to Peoria | 39 | 9 | 27 | 5 | 80 | -4 | 48.0% | 17.7% |
| Peoria to Havana | 153 | 2 | 85 | 4 | 244 | 63 | 36.3% | 5.2% |
| Havana to Beardstown | 0 | -- | 0.0% | |||||
| South to Grafton | 0 | -- | 0.0% | |||||
| Illinois River Subtotal | 220 | 11 | 116 | 9 | 356 | 4 | 36.6% | 9.5% |
| Mississippi River | ||||||||
| Lock & Dam # 2 & 3 | 32 | 5 | 2 | 39 | 29 | 17.9% | -42.1% | |
| Lock & Dam # 4 & 5 | 22 | 3 | 8 | 33 | 2 | 33.3% | -5.4% | |
| Lock & Dam # 5A & 6 | 2 | 2 | 0 | 0.0% | 0.0% | |||
| Lock & Dam # 7 & 8 | 8 | 2 | 2 | 12 | 4 | 20.0% | 7.5% | |
| Lock & Dam # 9 & 10 | 17 | 2 | 1 | 20 | -12 | 10.5% | -5.1% | |
| Inland | 5 | 1 | 1 | 7 | -13 | 28.6% | 3.6% | |
| Lock & Dam # 11 & 12 | 98 | 6 | 15 | 119 | 23 | 17.6% | -14.7% | |
| Sav. Army Depot & Iowa | 51 | 3 | 16 | 3 | 73 | 10 | 27.1% | -11.0% |
| Lock & Dam # 13 | 125 | 42 | 167 | 19 | 25.1% | 22.0% | ||
| Lock & Dam # 14 | 67 | 1 | 33 | 101 | 66 | 33.7% | 19.4% | |
| Lock & Dam #15 | 111 | 4 | 63 | 3 | 181 | 140 | 37.6% | 20.0% |
| Lock & Dam #16 | 110 | 35 | 145 | 113 | 24.1% | 21.0% | ||
| Lock & Dam # 17 | 36 | 12 | 2 | 50 | -15 | 25.0% | 23.3% | |
| Inland | 2 | 2 | -79 | 0.0% | -24.7% | |||
| Lock & Dam # 18 | 1578 | 194 | 1772 | 1498 | 10.9% | -0.7% | ||
| Lock & Dam # 19 | 149 | 41 | 1 | 191 | -72 | 21.6% | -8.4% | |
| Lock & Dam # 20 | 29 | 14 | 65 | 108 | 41 | 32.6% | 1.8% | |
| Lock & Dam # 21 & 22 | 24 | 5 | 10 | 3 | 42 | -1 | 38.5% | -0.7% |
| Lock & Dam # 24 & 25 | 14 | 3 | 17 | -9 | 17.6% | -13.2% | ||
| St. Louis and South | 12 | 1 | 8 | 1 | 22 | -70 | 42.9% | -2.2% |
| Miss. River Subtotal | 2492 | 29 | 501 | 81 | 3103 | 1702 | 17.5% | -5.6% |
| Tennessee | 0 | -- | -- | -- | ||||
| Kentucky | 12 | 2 | 22 | 1 | 37 | 23 | 66.7% | -4.7% |
| Missouri River | 0 | -- | -- | -- | ||||
| Louisiana | 11 | 6 | 17 | -- | 35.3% | -- | ||
| 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% |
| 2008 Grand Totals | 3018 | 96 | 837 | 101 | 4052 | 228 | 23.6% | 3.9% |
| 2007 Grand Totals | 3033 | 88 | 656 | 47 | 3824 | 2099 | 19.7% | -3.5% |