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

Osprey Population Trend in Wyoming

All statesGeneralists

Osprey in Wyoming has risen sharply: up 70% on the route-weighted index since 1975.

+70%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 →
31Routes 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 →
48YearsYears 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 risen sharply in Wyoming: up 70% on the route-weighted index since 1975.

Osprey Population Forecast in Wyoming

If the recent trend holds, Osprey in Wyoming is projected to fall about 21% by 2029 — from 0.25 in 2024 to a central estimate of 0.20 (95% range 0.08–0.31). A 5-year backtest shows a typical error of ±37.2%, with 100% of held-out values landing inside the 95% band.

-21%Change by 2029TrendPercent 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 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.08–0.3195% 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 →
±37.2%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 fall about 21% by 2029 — from 0.25 in 2024 to a central estimate of 0.20 (95% range 0.08–0.31). A 5-year backtest shows a typical error of ±37.2%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20250.180.070.30
20260.190.070.30
20270.190.070.31
20280.190.080.31
20290.200.080.31

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 →
Wilson520241979
Mammoth320101991
Otto220082008
Basin220232017
Yellowstone220191988
Clark220242003
Lovell220192003
Seedskadee 2220242024
Alpine220241980
Horse Creek220241999
Colter Bay 2220242021
Fiddler Lk220241993
Wamsutter220242024
Fox Park220222022
Ne Entrance120212001
Colter Bay119991968
Dubois120222009
Midvale119751975
Fontenelle120241993
Seely 2120222022
Moose120221983
Dayton120092009
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 2026-05-22.