BirdAnalyst
Species · BCR 10 · BBS 2026 Release · 1966–2025

Golden Eagle In Northern Rockies

All regionsNorthern RockiesBirds of prey

Golden Eagle in Northern Rockies has surged: up 161% on the route-weighted index since 1970.

+161%Since 1970TrendPercent 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 →
146Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
57YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 →

Golden Eagle has surged in Northern Rockies: up 161% on the route-weighted index since 1970.

Golden Eagle In Northern Rockies Population Forecast

If the recent trend holds, Golden Eagle in Northern Rockies is projected to stay roughly flat through 2030, near 0.39 (95% range 0.21–0.58). A 5-year backtest shows a typical error of ±38.2%, with 80% of held-out values landing inside the 95% band.

+7%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 →
0.39Projected 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 →
0.21–0.5895% 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 →
±38.2%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, Golden Eagle in Northern Rockies is projected to stay roughly flat through 2030, near 0.39 (95% range 0.21–0.58). A 5-year backtest shows a typical error of ±38.2%, with 80% 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 →
20260.390.200.57
20270.390.200.57
20280.390.210.57
20290.390.210.57
20300.390.210.58

Routes In Northern Rockies

Routes recording Golden Eagle in Northern Rockies.
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 →
RelianceWYOMING92018
GlenMONTANA62025
CumberlandWYOMING62025
LimaMONTANA52025
HarmonyWYOMING52022
MeeteetseWYOMING42024
CarterWYOMING42016
SpartaOREGON32025
Clover CreekOREGON31977
KellerWASHINGTON31988
MidvaleWYOMING32025
Carter 2WYOMING32025
Great DivideCOLORADO22025
PolsonMONTANA22023
Willow CreekMONTANA21980
GreenoughMONTANA22000
LogdellOREGON22018
TwickenhamOREGON22011
DuboisWYOMING22025
Elk HornWYOMING22002
Bear CreekWYOMING22022
ErvayWYOMING22024
MckinnonWYOMING21986
RiversideWYOMING22023
Hunter PeakWYOMING22006

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