BirdAnalyst
Species · BCR 19 · BBS 2025 Release · 1966–2024

Bald Eagle In Central Mixed Grass Prairie

All regionsCentral Mixed Grass PrairieGeneralists

Bald Eagle in Central Mixed Grass Prairie has surged: up 384% on the route-weighted index since 2004.

+384%Since 2004TrendPercent 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 →
18Routes 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 →
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 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 Central Mixed Grass Prairie: up 384% on the route-weighted index since 2004.

Bald Eagle In Central Mixed Grass Prairie Population Forecast

If the recent trend holds, Bald Eagle in Central Mixed Grass Prairie is projected to rise about 57% by 2029 — from 0.06 in 2024 to a central estimate of 0.09 (95% range 0.04–0.14). A 5-year backtest shows a typical error of ±38.1%, with 40% of held-out values landing inside the 95% band.

+57%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 →
0.09Projected 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 →
0.04–0.1495% 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 →
±38.1%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 Central Mixed Grass Prairie is projected to rise about 57% by 2029 — from 0.06 in 2024 to a central estimate of 0.09 (95% range 0.04–0.14). A 5-year backtest shows a typical error of ±38.1%, with 40% of held-out values landing inside the 95% band.20012029
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 →
20250.080.030.13
20260.080.030.13
20270.090.040.14
20280.090.040.14
20290.090.040.14

Routes In Central Mixed Grass Prairie

Routes recording Bald Eagle in Central Mixed Grass 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 →
KennedyNEBRASKA22022
WellingtonKANSAS12024
DaltonKANSAS12023
HanoverKANSAS12017
SolomonKANSAS12011
GoesselKANSAS12017
KearneyNEBRASKA12023
SumnerNEBRASKA12016
SurpriseNEBRASKA12021
AlmeriaNEBRASKA12021
Swan LakeNEBRASKA12022
Piester LakeNEBRASKA12023
BrownleeNEBRASKA12024
Liberty 3NEBRASKA12016
NenzelNEBRASKA12024
HendleyNEBRASKA12024
CashionOKLAHOMA12022
WoodwardOKLAHOMA12017

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