BirdAnalyst
Species · Wisconsin · BBS 2025 Release · 1966–2024

Osprey Population Trend in Wisconsin

All statesGeneralists

Osprey in Wisconsin has surged: up 359% on the route-weighted index since 1969.

+359%Since 1969
54Routes In State
54Years

Notable Osprey Trends in Wisconsin

long arc increasecomputed index

Osprey has surged in Wisconsin: up 359% on the route-weighted index since 1969.

Osprey Population Forecast in Wisconsin

If the recent trend holds, Osprey in Wisconsin is projected to fall about 18% by 2029 — from 0.22 in 2024 to a central estimate of 0.18 (95% range 0.10–0.26). A 5-year backtest shows a typical error of ±31%, with 100% of held-out values landing inside the 95% band.

-18%Change by 2029
0.18Projected 2029 index
0.10–0.2695% range
±31%Backtest error
19672029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.170.090.25
20260.170.090.26
20270.180.090.26
20280.180.100.26
20290.180.100.26

Osprey Survey Routes in Wisconsin

Routes recording Osprey in Wisconsin.
Omro 2920242002
Gilman319921992
Cumberland220231989
Couderay220191977
Omro220011997
Manitowoc220242007
Flambeau220231998
Beaver Dam220132011
Minong120211979
Grand View120062006
Bayfield120001999
Shanagolden120161983
Montreal120192007
Land O Lakes120161988
Hudson120232007
Dresser120221990
Union Twp120101984
Loraine120181969
Weyerhauser120241973
Exeland120112011
Phillips120242009
Rib Lake120241988
Merrill119761976
Irma120121968
Mcnaughton120241988

Osprey Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinaohiooregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.