BirdAnalyst
Species · BCR 14 · BBS 2025 Release · 1966–2024

Bald Eagle In Atlantic Northern Forest

All regionsAtlantic Northern ForestGeneralists

Bald Eagle in Atlantic Northern Forest has surged: up 469% on the route-weighted index since 1996.

+469%Since 1996TrendPercent 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 →
37Routes 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 →
28YearsYears 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 Atlantic Northern Forest: up 469% on the route-weighted index since 1996.

Bald Eagle In Atlantic Northern Forest Population Forecast

If the recent trend holds, Bald Eagle in Atlantic Northern Forest is projected to stay roughly flat through 2029, near 0.07 (95% range 0.03–0.11). A 5-year backtest shows a typical error of ±49%, with 20% of held-out values landing inside the 95% band.

+2%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 →
0.07Projected 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 →
0.03–0.1195% 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%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 Atlantic Northern Forest is projected to stay roughly flat through 2029, near 0.07 (95% range 0.03–0.11). A 5-year backtest shows a typical error of ±49%, with 20% of held-out values landing inside the 95% band.19802029
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 →
20250.060.020.10
20260.060.020.10
20270.060.020.10
20280.070.030.10
20290.070.030.11

Routes In Atlantic Northern Forest

Routes recording Bald Eagle in Atlantic Northern Forest.
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 →
GreenwoodMAINE22001
Turner 2MAINE22024
Wilson MillsMAINE12023
HartfordMAINE12017
HarmonyMAINE12013
HermonMAINE12005
CooperMAINE12021
Carrying PlMAINE12019
CarrabassettMAINE12023
CharlestonMAINE12007
Seboomook LkMAINE12005
MedwayMAINE12018
Clayton LakeMAINE11999
AshlandMAINE12006
Baker LakeMAINE12000
RomeMAINE12012
JeffersonMAINE11996
Church HillMAINE12014
Lake MoxieMAINE12013
CornvilleMAINE12023
SearsportMAINE12022
Brownfield 2MAINE12023
SheffieldMASSACHUSETTS11981
ConcordNEW-HAMPSHIRE12018
WalpoleNEW-HAMPSHIRE12024

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