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

Bald Eagle Population Trend in Pennsylvania

All statesBirds of prey

Bald Eagle in Pennsylvania has surged: up 772% on the route-weighted index since 1983.

+772%Since 1983TrendPercent 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 →
63Routes 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 →
35YearsYears 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 PennsylvaniaNotable 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 Pennsylvania. See the full index history below.

Bald Eagle Population Forecast in Pennsylvania

If the recent trend holds, Bald Eagle in Pennsylvania is projected to fall about 34% by 2030 — from 0.26 in 2025 to a central estimate of 0.17 (95% range 0.06–0.28). A 5-year backtest shows a typical error of ±57.9%, with 0% of held-out values landing inside the 95% band.

-34%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 →
0.17Projected 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 →
0.06–0.2895% 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 →
±57.9%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 Pennsylvania is projected to fall about 34% by 2030 — from 0.26 in 2025 to a central estimate of 0.17 (95% range 0.06–0.28). A 5-year backtest shows a typical error of ±57.9%, with 0% of held-out values landing inside the 95% band.19772030
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 →
20260.160.050.27
20270.160.050.27
20280.160.050.28
20290.170.060.28
20300.170.060.28

Bald Eagle Survey Routes in Pennsylvania

Routes recording Bald Eagle in Pennsylvania.
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 →
Waterstreet420242013
Brunnerville 2320242024
Jacobus320242024
Harmonsburg220252010
Starlight 2220252025
Pottersdale220232023
Rasselas220072007
Arnot220252018
Leola220252014
Little Marsh220152015
Elizabethvil220212001
Margaret220242024
Geeseytown220252025
Espyville120241994
Clover120232000
Ferris Crnrs120232006
Whig Hill120212010
Ellenton120192019
Teepleville120252017
Wyalusing120251998
Lynch120252014
Berwick120232023
Odin120242024
Wild Creek120212021
Lovelton120232021

Bald Eagle Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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