BirdAnalyst
Species · BCR 28 · BBS 2025 Release · 1966–2024

Bald Eagle In Appalachian Mountains

All regionsAppalachian MountainsGeneralists

Bald Eagle in Appalachian Mountains has surged: up 12× on the route-weighted index since 1982.

12×Since 1982TrendPercent 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 →
109Routes 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 →
38YearsYears 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 →

Bald Eagle has surged in Appalachian Mountains: up 12× on the route-weighted index since 1982.

Bald Eagle In Appalachian Mountains Population Forecast

If the recent trend holds, Bald Eagle in Appalachian Mountains is projected to fall about 38% by 2029 — from 0.15 in 2024 to a central estimate of 0.09 (95% range 0.04–0.14). A 5-year backtest shows a typical error of ±58.7%, with 0% of held-out values landing inside the 95% band.

-38%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 →
0.09Projected 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 →
0.04–0.1495% 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 →
±58.7%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 Appalachian Mountains is projected to fall about 38% by 2029 — from 0.15 in 2024 to a central estimate of 0.09 (95% range 0.04–0.14). A 5-year backtest shows a typical error of ±58.7%, with 0% of held-out values landing inside the 95% band.19772029
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 →
20250.080.040.13
20260.090.040.14
20270.090.040.14
20280.090.040.14
20290.090.040.14

Routes In Appalachian Mountains

Routes recording Bald Eagle in Appalachian Mountains.
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 →
Lost RiverWEST-VIRGINIA52021
ArnotPENNSYLVANIA42024
WaterstreetPENNSYLVANIA42024
WilliamsportMARYLAND32024
CobleskillNEW-YORK32023
Brunnerville 2PENNSYLVANIA32024
Mo Of SenecaWEST-VIRGINIA32023
MidvaleNEW-JERSEY22006
MeridaleNEW-YORK22022
Platte CoveNEW-YORK22012
Phillips CrNEW-YORK22015
DownsvilleNEW-YORK22019
StonecreekOHIO22023
PottersdalePENNSYLVANIA22023
RasselasPENNSYLVANIA22007
Little MarshPENNSYLVANIA22015
Pocono SummitPENNSYLVANIA22023
MargaretPENNSYLVANIA22024
ElizabethvilPENNSYLVANIA22021
WyalusingPENNSYLVANIA22023
Signal MtnTENNESSEE22022
Sugar GroveWEST-VIRGINIA22022
Pine GroveALABAMA12024
Smyer LakeALABAMA12024
GuntersvilleALABAMA12014

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