BirdAnalyst
Species · BCR 29 · BBS 2025 Release · 1966–2024

Bald Eagle In Piedmont

All regionsPiedmontGeneralists

Bald Eagle in Piedmont has surged: up 270% on the route-weighted index since 1990.

+270%Since 1990TrendPercent 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 →
43Routes 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 →
29YearsYears 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 Piedmont: up 270% on the route-weighted index since 1990.

Bald Eagle In Piedmont Population Forecast

If the recent trend holds, Bald Eagle in Piedmont is projected to fall about 25% by 2029 — from 0.13 in 2024 to a central estimate of 0.10 (95% range 0.00–0.20). A 5-year backtest shows a typical error of ±54.1%, with 100% of held-out values landing inside the 95% band.

-25%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 →
0.10Projected 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 →
0.00–0.2095% 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 →
±54.1%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 Piedmont is projected to fall about 25% by 2029 — from 0.13 in 2024 to a central estimate of 0.10 (95% range 0.00–0.20). A 5-year backtest shows a typical error of ±54.1%, with 100% of held-out values landing inside the 95% band.19702029
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 →
20250.090.000.20
20260.090.000.20
20270.100.000.20
20280.100.000.20
20290.100.000.20

Routes In Piedmont

Routes recording Bald Eagle in Piedmont.
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 →
EmmitsburgMARYLAND42024
JacobusPENNSYLVANIA32024
IjamsvilleMARYLAND22023
ArcolaNORTH-CAROLINA22023
Big IslandVIRGINIA22024
LanettALABAMA12021
ForsythGEORGIA12012
BaldwinGEORGIA12011
SiloamGEORGIA11993
Curry HillGEORGIA12019
OlneyMARYLAND12022
WarfieldsbrgMARYLAND12018
Bachman MillMARYLAND12024
FowblesburgMARYLAND11984
EkloMARYLAND12017
Upper XrdsMARYLAND11993
Van BibberMARYLAND12010
TheodoreMARYLAND12016
MadonnaMARYLAND12019
EarltonMARYLAND12022
SandbrookNEW-JERSEY12023
CrotonNEW-JERSEY11970
PottersvilleNEW-JERSEY12013
ClimaxNORTH-CAROLINA12022
EdenNORTH-CAROLINA12021

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