BirdAnalyst
Species · BCR 10 · BBS 2025 Release · 1966–2024

Golden Eagle In Northern Rockies

All regionsNorthern RockiesGeneralists

Golden Eagle in Northern Rockies has surged: up 209% on the route-weighted index since 1970.

+209%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 →
144Routes 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 →
56YearsYears 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 209% 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 rise about 79% by 2029 — from 0.22 in 2024 to a central estimate of 0.39 (95% range 0.21–0.58). A 5-year backtest shows a typical error of ±33.3%, with 80% of held-out values landing inside the 95% band.

+79%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 →
0.39Projected 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 →
0.21–0.5895% 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 →
±33.3%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 Northern Rockies is projected to rise about 79% by 2029 — from 0.22 in 2024 to a central estimate of 0.39 (95% range 0.21–0.58). A 5-year backtest shows a typical error of ±33.3%, with 80% 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 →
20250.390.200.57
20260.390.200.57
20270.390.210.57
20280.390.210.57
20290.390.210.58

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 →
LimaMONTANA122019
RelianceWYOMING92018
NowoodWYOMING52017
HarmonyWYOMING52022
MeeteetseWYOMING42024
CarterWYOMING42016
Clover CreekOREGON31977
KellerWASHINGTON31988
CumberlandWYOMING32023
ArmintoWYOMING32024
WamsutterWYOMING32024
WalcottWYOMING32024
PolsonMONTANA22023
Willow CreekMONTANA21980
GlenMONTANA22023
GreenoughMONTANA22000
LogdellOREGON22018
BridgeportOREGON22022
SpartaOREGON22001
TwickenhamOREGON22011
DuboisWYOMING22022
MidvaleWYOMING22022
Elk HornWYOMING22002
Bear CreekWYOMING22022
ErvayWYOMING22024

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