BirdAnalyst
Species · BCR 22 · BBS 2026 Release · 1966–2025

Bald Eagle In Eastern Tallgrass Prairie

All regionsEastern Tallgrass PrairieBirds of prey

Bald Eagle in Eastern Tallgrass Prairie has surged: up 32× on the route-weighted index since 1999.

32×Since 1999TrendPercent 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 →
123Routes 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 →

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

Bald Eagle In Eastern Tallgrass Prairie Population Forecast

If the recent trend holds, Bald Eagle in Eastern Tallgrass Prairie is projected to stay roughly flat through 2030, near 0.25 (95% range 0.18–0.31). A 5-year backtest shows a typical error of ±33.8%, with 20% of held-out values landing inside the 95% band.

-4%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 →
0.18–0.3195% 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 →
±33.8%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 Eastern Tallgrass Prairie is projected to stay roughly flat through 2030, near 0.25 (95% range 0.18–0.31). A 5-year backtest shows a typical error of ±33.8%, with 20% of held-out values landing inside the 95% band.19962030
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 →
20260.210.150.28
20270.220.150.29
20280.230.160.30
20290.240.170.31
20300.250.180.31

Routes In Eastern Tallgrass Prairie

Routes recording Bald Eagle in Eastern Tallgrass Prairie.
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 →
OlsburgKANSAS52025
BelleviewILLINOIS32024
JamestownINDIANA32025
MontpelierINDIANA32019
ExlineIOWA32025
Davis CornerIOWA32025
MinonkILLINOIS22022
MonticelloILLINOIS22025
BeaucoupILLINOIS22022
Camp PointILLINOIS22025
PaysonILLINOIS22025
EubanksILLINOIS22025
FowlerINDIANA22022
WabashINDIANA22025
CubaINDIANA22024
Kankakee SandsINDIANA22025
DinsdaleIOWA22024
PittsburgKANSAS22007
Ash CreekMINNESOTA22024
FrontenacMINNESOTA22023
RensselaerMISSOURI22024
SticklervillMISSOURI22017
GretnaNEBRASKA22016
RichlandNEBRASKA22024
BotkinsOHIO22018

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