BirdAnalyst
Species · BCR 17 · BBS 2025 Release · 1966–2024

Bald Eagle In Badlands and Prairies

All regionsBadlands and PrairiesGeneralists

Bald Eagle in Badlands and Prairies has surged: up 366% on the route-weighted index since 1984.

+366%Since 1984TrendPercent 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 →
41Routes 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 →

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 Badlands and Prairies: up 366% on the route-weighted index since 1984.

Bald Eagle In Badlands and Prairies Population Forecast

If the recent trend holds, Bald Eagle in Badlands and Prairies is projected to fall about 25% by 2029 — from 0.17 in 2024 to a central estimate of 0.13 (95% range 0.03–0.23). A 5-year backtest shows a typical error of ±33.9%, with 80% 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 →
0.13Projected 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 →
0.03–0.2395% 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 →
±33.9%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 Badlands and Prairies is projected to fall about 25% by 2029 — from 0.17 in 2024 to a central estimate of 0.13 (95% range 0.03–0.23). A 5-year backtest shows a typical error of ±33.9%, with 80% of held-out values landing inside the 95% band.19712029
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 →
20250.120.020.22
20260.120.020.22
20270.120.020.22
20280.130.030.23
20290.130.030.23

Routes In Badlands and Prairies

Routes recording Bald Eagle in Badlands and Prairies.
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 →
KayceeWYOMING42024
ForsythMONTANA32023
HighwoodMONTANA22023
ZapNORTH-DAKOTA22024
Glen UllinNORTH-DAKOTA22017
DaytonWYOMING22023
Two DotMONTANA12024
IngomarMONTANA12016
Reed PointMONTANA12018
St XavierMONTANA12010
BrandenbergMONTANA12019
PowdervilleMONTANA12017
AlbionMONTANA12024
Flatwillow 2MONTANA12022
St Xavier 2MONTANA12023
CusterMONTANA12022
Coleman CouleeMONTANA12018
Miles CityMONTANA12015
Roosevelt PkNORTH-DAKOTA12016
BentleyNORTH-DAKOTA12024
SolenNORTH-DAKOTA12019
RockyfordSOUTH-DAKOTA12023
Ft ThompsonSOUTH-DAKOTA12003
VolunteerSOUTH-DAKOTA12016
Fort PierreSOUTH-DAKOTA12023

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