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 NestsNumber of Occupied TerritoriesNumber of Active NestsNumber of Successful NestsNumber of Failed NestsNumber of Young ProducedNumber of Young Produced per Active NestsNumber of Young Produced per Successful Nests
2012192910397815301269891.31.9
201323121527123093023518351.52.0
20141774132583758223011091.31.9
20151333107376353221810151.31.9
2016132110116014021558011.32.0
201710748525373331706471.21.9
201810157965103711017221.41.9
20199538145994081518001.32.0
20208907685684251438271.51.9
2021135210367094592138661.21.9
202210298655083761197031.41.9