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

Golden Eagle Population Trend in Idaho

All statesBirds of prey

Golden Eagle in Idaho has declined: down 26% on the route-weighted index since 1971.

-26%Since 1971TrendPercent 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 →
36Routes 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 →
51YearsYears 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 IdahoNotable 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 Idaho. See the full index history below.

Golden Eagle Population Forecast in Idaho

If the recent trend holds, Golden Eagle in Idaho is projected to stay roughly flat through 2030, near 0.05 (95% range 0.00–0.23). A 5-year backtest shows a typical error of ±58.6%, with 60% of held-out values landing inside the 95% band.

-9%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 →
0.05Projected 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 →
0.00–0.2395% 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 →
±58.6%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 Idaho is projected to stay roughly flat through 2030, near 0.05 (95% range 0.00–0.23). A 5-year backtest shows a typical error of ±58.6%, with 60% of held-out values landing inside the 95% band.19692030
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 →
20260.060.000.24
20270.060.000.24
20280.060.000.24
20290.050.000.23
20300.050.000.23

Golden Eagle Survey Routes in Idaho

Routes recording Golden Eagle in Idaho.
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 →
Leadore320241974
Dubois320241969
Squirrel219941994
Ririe219711971
Magic Mtn220181987
Iron Springs220231988
Silver City220132008
Gifford119901990
Nezperce119851985
Twin Buttes120101999
Kyle Canyon120241985
Golden120062006
Circular Bu120162007
Baker120232004
Tractor Flat120231995
Rochat Divde120081997
Challis120212021
Blacks Creek119981973
Craters120091991
Triangle120141990
Glenns Ferry119861985
Acequia120121979
Sawtooth City 2120192017
Salmon River120021988
Cobalt120251994

Golden Eagle Population Trend in Other States

alaskaarizonacaliforniacoloradomontananebraskanevadanew-mexiconew-yorknorth-dakotaoklahomaoregonsouth-dakotatexasutahwashingtonwyoming

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