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

Bald Eagle Population Trend in Idaho

All statesGeneralists

Bald Eagle in Idaho has held roughly steady: up 8% on the route-weighted index since 1984.

+8%Since 1984TrendPercent 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 →
26Routes 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 →
36YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Bald 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 Bald Eagle in Idaho. See the full index history below.

Bald Eagle Population Forecast in Idaho

If the recent trend holds, Bald Eagle in Idaho is projected to fall about 37% by 2029 — from 0.36 in 2024 to a central estimate of 0.23 (95% range 0.00–0.45). A 5-year backtest shows a typical error of ±49.7%, with 60% of held-out values landing inside the 95% band.

-37%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 →
0.23Projected 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 →
0.00–0.4595% 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 →
±49.7%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, Bald Eagle in Idaho is projected to fall about 37% by 2029 — from 0.36 in 2024 to a central estimate of 0.23 (95% range 0.00–0.45). A 5-year backtest shows a typical error of ±49.7%, with 60% of held-out values landing inside the 95% band.19742029
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 →
20250.210.000.44
20260.220.000.44
20270.220.000.44
20280.220.000.45
20290.230.000.45

Bald Eagle Survey Routes in Idaho

Routes recording Bald 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 →
Cascade819841983
Bates420191998
Baker320222008
Leadore320242007
Naples220241988
Lost River220082008
Iron Springs220242011
Picabo220092009
Mivoden120172014
Gifford120162015
Nezperce120122012
Lolo Pass120062006
Circular Bu120072007
Cape Horn120162012
N Fork Cda R120182003
Blacks Creek119741974
Centerville120102010
Springfield119961992
Ririe120211999
Coolin120042004
Sawtooth City 2120242016
Featherville120241990
Mud Lake120232023
Cedar Hill120142014
Daniels Res120132013

Bald Eagle Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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