BirdAnalyst
Species · BCR 11 · BBS 2026 Release · 1966–2025

Bald Eagle In Prairie Potholes

All regionsPrairie PotholesBirds of prey

Bald Eagle in Prairie Potholes has surged: up 999% on the route-weighted index since 1996.

+999%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 →
60Routes 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 →
27YearsYears 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 Potholes. See the full index history below.

Bald Eagle In Prairie Potholes Population Forecast

If the recent trend holds, Bald Eagle in Prairie Potholes is projected to stay roughly flat through 2030, near 0.22 (95% range 0.14–0.29). A 5-year backtest shows a typical error of ±38.6%, with 20% of held-out values landing inside the 95% band.

+6%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 →
0.22Projected 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 →
0.14–0.2995% 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 →
±38.6%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 Potholes is projected to stay roughly flat through 2030, near 0.22 (95% range 0.14–0.29). A 5-year backtest shows a typical error of ±38.6%, with 20% of held-out values landing inside the 95% band.19922030
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 →
20260.190.120.26
20270.200.120.27
20280.200.130.28
20290.210.140.28
20300.220.140.29

Routes In Prairie Potholes

Routes recording Bald Eagle in Prairie Potholes.
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 →
HuntleyMINNESOTA22025
WorthingtonMINNESOTA22022
FormanNORTH-DAKOTA22024
WimbledonNORTH-DAKOTA22025
Horsehead LkNORTH-DAKOTA22025
BuchananNORTH-DAKOTA22024
BowesmontNORTH-DAKOTA22014
VolgaSOUTH-DAKOTA22024
WilmotSOUTH-DAKOTA22024
VeblenSOUTH-DAKOTA22023
ForbesSOUTH-DAKOTA22017
PantherIOWA12024
WashingtonIOWA12000
KanawhaIOWA12025
MccallsburgIOWA12017
HartlandMINNESOTA12010
ArlingtonMINNESOTA12021
CourtlandMINNESOTA12021
DawsonMINNESOTA12025
AppletonMINNESOTA12024
GluekMINNESOTA12013
ChokioMINNESOTA12025
GlyndonMINNESOTA12024
OkleeMINNESOTA12009
BeltramiMINNESOTA12025

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