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

Golden Eagle Population Trend in Colorado

All statesBirds of prey

Golden Eagle in Colorado has edged down: down 13% on the route-weighted index since 1972.

-13%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 →
108Routes 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 →
55YearsYears 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 fall about 15% by 2030 — from 0.21 in 2025 to a central estimate of 0.18 (95% range 0.01–0.35). A 5-year backtest shows a typical error of ±16.3%, with 100% of held-out values landing inside the 95% band.

-15%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 →
0.18Projected 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 →
0.01–0.3595% 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 →
±16.3%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 fall about 15% by 2030 — from 0.21 in 2025 to a central estimate of 0.18 (95% range 0.01–0.35). A 5-year backtest shows a typical error of ±16.3%, with 100% of held-out values landing inside the 95% band.19702030
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 →
20260.190.010.36
20270.180.010.36
20280.180.010.36
20290.180.010.36
20300.180.010.35

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 →
Moffat620251970
Antonito519961996
Trinchera320001999
Cortez320081989
Rifle Falls320211998
Great Divide220251974
Aspen219981989
Cheesman Lk220181981
Blanca219871979
Mica Butte219861971
Wilson Creek220251992
Walden220241991
Wildhorse L220112002
Tarryall220232000
Tincup220091994
Gribbles Prk220242000
Ellicott219991995
Karval220142014
Yellowjacket Pass220251998
Mesaverde Np220241997
Maybell120181970
Yampa120211972
Harmony120221974
Briggsdale119921986
Pinneo120101999

Golden Eagle Population Trend in Other States

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