BirdAnalyst
Species · BCR 23 · BBS 2026 Release · 1966–2025

Bald Eagle In Prairie Hardwood Transition

All regionsPrairie Hardwood TransitionBirds of prey

Bald Eagle in Prairie Hardwood Transition has surged: up 43× on the route-weighted index since 1983.

43×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 →
102Routes 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 →
42YearsYears 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 →

No notable trend signals for Bald Eagle in Prairie Hardwood Transition. See the full index history below.

Bald Eagle In Prairie Hardwood Transition Population Forecast

If the recent trend holds, Bald Eagle in Prairie Hardwood Transition is projected to stay roughly flat through 2030, near 0.48 (95% range 0.35–0.62). A 5-year backtest shows a typical error of ±28.9%, with 20% of held-out values landing inside the 95% band.

-9%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 →
0.48Projected 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 →
0.35–0.6295% 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 →
±28.9%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 Prairie Hardwood Transition is projected to stay roughly flat through 2030, near 0.48 (95% range 0.35–0.62). A 5-year backtest shows a typical error of ±28.9%, with 20% of held-out values landing inside the 95% band.19712030
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 →
20260.440.310.57
20270.450.320.59
20280.460.330.60
20290.470.340.61
20300.480.350.62

Routes In Prairie Hardwood Transition

Routes recording Bald Eagle in Prairie Hardwood Transition.
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 →
WeyerhauserWISCONSIN42025
OmroWISCONSIN41996
FestinaIOWA32025
KnappMINNESOTA32025
Sherburne NrMINNESOTA32025
NapoleonOHIO32025
MerrillWISCONSIN32024
TrempealeauWISCONSIN32025
MatherWISCONSIN32023
CascoWISCONSIN32024
EdenWISCONSIN32025
GreshamWISCONSIN32025
GuilfordILLINOIS22023
Cherry Val 2ILLINOIS22013
MillvilleMINNESOTA22018
PrincetonMINNESOTA22024
St StephenMINNESOTA22006
EdwardsMINNESOTA22023
AshbyMINNESOTA22014
Chatfield 2MINNESOTA22025
KingswayOHIO22022
DresserWISCONSIN22025
LoraineWISCONSIN22018
CochraneWISCONSIN22025
Wis RapidsWISCONSIN22023

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