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

Golden Eagle Population Trend in Colorado

All statesGeneralists

Golden Eagle in Colorado has edged down: down 16% on the route-weighted index since 1972.

-16%Since 1972TrendPercent 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 →
105Routes 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 →
54YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

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

No notable trend signals for Golden Eagle in Colorado. See the full index history below.

Golden Eagle Population Forecast in Colorado

If the recent trend holds, Golden Eagle in Colorado is projected to stay roughly flat through 2029, near 0.18 (95% range 0.01–0.35). A 5-year backtest shows a typical error of ±24%, with 100% of held-out values landing inside the 95% band.

+3%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 →
0.18Projected 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 →
0.01–0.3595% 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 →
±24%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, Golden Eagle in Colorado is projected to stay roughly flat through 2029, near 0.18 (95% range 0.01–0.35). A 5-year backtest shows a typical error of ±24%, with 100% of held-out values landing inside the 95% band.19702029
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 →
20250.190.010.36
20260.180.010.36
20270.180.010.36
20280.180.010.36
20290.180.010.35

Golden Eagle Survey Routes in Colorado

Routes recording Golden Eagle in Colorado.
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 →
Antonito519961996
Gilpin320111975
Trinchera320001999
Cortez320081989
Rifle Falls320211998
Aspen219981989
Cheesman Lk220181981
Blanca219871979
Mica Butte219861971
Walden220241991
Wildhorse L220112002
Tarryall220232000
De Beque220222001
Tincup220091994
Gribbles Prk220242000
Ellicott219991995
Karval220142014
Yellowjacket Pass220181998
Mesaverde Np220241997
Maybell120181970
Great Divide120231974
Yampa120211972
Harmony120221974
Briggsdale119921986
Pinneo120101999

Golden Eagle Population Trend in Other States

alaskaarizonacaliforniaidahomontananebraskanevadanew-mexiconew-yorknorth-dakotaoklahomaoregonsouth-dakotatexasutahwashingtonwyoming

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