BirdAnalyst
Species · BCR 10 · BBS 2025 Release · 1966–2024

Bald Eagle In Northern Rockies

All regionsNorthern RockiesGeneralists

Bald Eagle in Northern Rockies has surged: up 853% on the route-weighted index since 1983.

+853%Since 1983
107Routes In Region
41Years

Notable Signals

long arc increasecomputed index

Bald Eagle has surged in Northern Rockies: up 853% on the route-weighted index since 1983.

Forecast

If the recent trend holds, Bald Eagle in Northern Rockies is projected to rise about 22% by 2029 — from 0.39 in 2024 to a central estimate of 0.48 (95% range 0.24–0.71). A 5-year backtest shows a typical error of ±33.4%, with 80% of held-out values landing inside the 95% band.

+22%Change by 2029
0.48Projected 2029 index
0.24–0.7195% range
±33.4%Backtest error
19692029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.430.200.67
20260.440.210.68
20270.460.220.69
20280.470.230.70
20290.480.240.71

Routes In Northern Rockies

Routes recording Bald Eagle in Northern Rockies.
LimaMONTANA112024
CascadeIDAHO81984
Malheur Res.OREGON72023
FontenelleWYOMING62024
Pablo Res.MONTANA52024
HarmonyWYOMING42023
KalispellMONTANA32024
Thompson RivMONTANA32023
GlenMONTANA32023
ChewelahWASHINGTON32021
CurlewWASHINGTON32018
Omak CreekWASHINGTON32024
RiversideWYOMING32023
WalcottWYOMING32024
MaybellCOLORADO22012
NaplesIDAHO22024
Libby DamMONTANA22013
Greenoagh 2MONTANA22008
TroyOREGON22023
UnityOREGON22024
Elk HornWYOMING22015
MammothWYOMING22009
EtheteWYOMING22023
DanielWYOMING21988
BoulderWYOMING22017

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