BirdAnalyst
Species · New Jersey · BBS 2026 Release · 1966–2025

Bald Eagle Population Trend in New Jersey

All statesBirds of prey

Bald Eagle in New Jersey has surged: up 175% on the route-weighted index since 2005.

+175%Since 2005TrendPercent 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 →
13Routes 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 →
18YearsYears 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 New JerseyNotable 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 New Jersey: up 175% on the route-weighted index since 2005.

Bald Eagle Population Forecast in New Jersey

If the recent trend holds, Bald Eagle in New Jersey is projected to rise about 14% by 2030 — from 0.22 in 2025 to a central estimate of 0.25 (95% range 0.07–0.43). A 5-year backtest shows a typical error of ±16.3%, with 100% of held-out values landing inside the 95% band.

+14%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 →
0.25Projected 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 →
0.07–0.4395% 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 →
±16.3%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 New Jersey is projected to rise about 14% by 2030 — from 0.22 in 2025 to a central estimate of 0.25 (95% range 0.07–0.43). A 5-year backtest shows a typical error of ±16.3%, with 100% of held-out values landing inside the 95% band.19702030
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 →
20260.240.060.42
20270.240.060.42
20280.240.060.43
20290.250.070.43
20300.250.070.43

Bald Eagle Survey Routes in New Jersey

Routes recording Bald Eagle in New Jersey.
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 →
Six Points220252004
Pedricktown220122012
Pedricktown 2220252015
Bennett Mill 2220242023
Midvale220062006
Friendship220232021
Greenwich120242006
Sandbrook120232017
Croton119701970
Ramseysburg120052005
Pottersville120132013
Keyport120042004
Roosevelt120172017

Bald Eagle Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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