Raptor biologists assess the health of osprey populations by looking at several reproductive parameters. The table below is a live calculation based on activity data entered by Osprey Watch volunteers. Reproductive rates from 0.8 to 1.2 are minimum values to sustain a population. The higher these values are the healthier the osprey population. These rates vary based on age-to-first-reproduction, survivorship rates, and many other factors.
| Total Number of Nests | Number of Occupied Territories | Number of Active Nests | Number of Successful Nests | Number of Failed Nests | Number of Young Produced | Number of Young Produced per Active Nests | Number of Young Produced per Successful Nests | |
|---|---|---|---|---|---|---|---|---|
| 2023 | 1246 | 1033 | 649 | 394 | 239 | 650 | 1.0 | 1.6 |
| 2022 | 1090 | 909 | 561 | 414 | 142 | 787 | 1.4 | 1.9 |
| 2021 | 1431 | 1115 | 782 | 484 | 260 | 897 | 1.1 | 1.9 |
| 2020 | 893 | 771 | 570 | 427 | 143 | 832 | 1.5 | 1.9 |
| 2019 | 955 | 816 | 600 | 409 | 151 | 802 | 1.3 | 2.0 |
| 2018 | 1015 | 796 | 511 | 372 | 101 | 724 | 1.4 | 1.9 |
| 2017 | 1075 | 853 | 537 | 333 | 171 | 647 | 1.2 | 1.9 |
| 2016 | 1321 | 1011 | 601 | 402 | 155 | 801 | 1.3 | 2.0 |
| 2015 | 1334 | 1073 | 763 | 532 | 218 | 1015 | 1.3 | 1.9 |
| 2014 | 1774 | 1325 | 837 | 582 | 230 | 1109 | 1.3 | 1.9 |
| 2013 | 2313 | 1528 | 1231 | 931 | 235 | 1838 | 1.5 | 2.0 |
| 2012 | 1929 | 1039 | 781 | 530 | 126 | 989 | 1.3 | 1.9 |