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 | |
---|---|---|---|---|---|---|---|---|
2024 | 205 | 203 | 15 | 5 | 7 | 11 | 0.7 | 2.2 |
2023 | 1246 | 1030 | 655 | 408 | 238 | 674 | 1.0 | 1.7 |
2022 | 1096 | 914 | 567 | 419 | 143 | 797 | 1.4 | 1.9 |
2021 | 1433 | 1117 | 784 | 486 | 260 | 901 | 1.1 | 1.9 |
2020 | 894 | 772 | 571 | 428 | 143 | 835 | 1.5 | 2.0 |
2019 | 956 | 817 | 601 | 410 | 151 | 805 | 1.3 | 2.0 |
2018 | 1017 | 798 | 512 | 373 | 102 | 727 | 1.4 | 1.9 |
2017 | 1076 | 854 | 538 | 334 | 171 | 651 | 1.2 | 1.9 |
2016 | 1322 | 1012 | 602 | 403 | 155 | 803 | 1.3 | 2.0 |
2015 | 1335 | 1074 | 764 | 533 | 218 | 1017 | 1.3 | 1.9 |
2014 | 1775 | 1326 | 838 | 583 | 230 | 1113 | 1.3 | 1.9 |
2013 | 2314 | 1529 | 1232 | 932 | 235 | 1841 | 1.5 | 2.0 |
2012 | 1931 | 1041 | 783 | 531 | 127 | 991 | 1.3 | 1.9 |