BirdAnalyst
Species · Wyoming · BBS 2026 Release · 1966–2025

Osprey Population Trend in Wyoming

All statesBirds of prey

Osprey in Wyoming has surged: up 102% on the route-weighted index since 1975.

+102%Since 1975TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
32Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
49YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Osprey Trends in WyomingNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Osprey has surged in Wyoming: up 102% on the route-weighted index since 1975.

Osprey Population Forecast in Wyoming

If the recent trend holds, Osprey in Wyoming is projected to stay roughly flat through 2030, near 0.20 (95% range 0.09–0.31). A 5-year backtest shows a typical error of ±25.1%, with 100% of held-out values landing inside the 95% band.

-6%Change by 2030TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
0.20Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.09–0.3195% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±25.1%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Osprey in Wyoming is projected to stay roughly flat through 2030, near 0.20 (95% range 0.09–0.31). A 5-year backtest shows a typical error of ±25.1%, with 100% of held-out values landing inside the 95% band.19682030
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20260.190.080.30
20270.190.080.31
20280.200.080.31
20290.200.090.31
20300.200.090.31

Osprey Survey Routes in Wyoming

Routes recording Osprey in Wyoming.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Wilson620251979
Mammoth320101991
Alpine320251980
Horse Creek320251999
Otto220082008
Basin220232017
Fontenelle220251993
Clark220252003
Lovell220192003
Seedskadee 2220242024
Wamsutter220242024
Fox Park220222022
Ne Entrance120212001
Yellowstone120251988
Colter Bay119991968
Dubois120222009
Midvale119751975
Seely 2120222022
Hunter Peak120252025
Moose120221983
Dayton120092009
Colter Bay 2120252021
Crowheart120212008
Sussex120242024
Seedskadee120231994

Osprey Population Trend in Other States

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

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.