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

Osprey In Northern Rockies

All regionsNorthern RockiesGeneralists

Osprey in Northern Rockies has risen sharply: up 53% on the route-weighted index since 1970.

+53%Since 1970
112Routes In Region
56Years

Notable Signals

long arc increasecomputed index

Osprey has risen sharply in Northern Rockies: up 53% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Osprey in Northern Rockies is projected to rise about 37% by 2029 — from 0.28 in 2024 to a central estimate of 0.39 (95% range 0.17–0.61). A 5-year backtest shows a typical error of ±50.5%, with 100% of held-out values landing inside the 95% band.

+37%Change by 2029
0.39Projected 2029 index
0.17–0.6195% range
±50.5%Backtest error
19682029
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
20250.380.150.60
20260.380.160.60
20270.380.160.61
20280.390.160.61
20290.390.170.61

Routes In Northern Rockies

Routes recording Osprey in Northern Rockies.
CascadeIDAHO131984
WilsonWYOMING52024
CentervilleIDAHO42019
NezperceIDAHO32012
CabartonIDAHO32023
SunbeamIDAHO32017
ClintonMONTANA32024
LaurierWASHINGTON32022
MammothWYOMING32010
NaplesIDAHO22021
MivodenIDAHO22018
Lolo PassIDAHO22014
Cape HornIDAHO22024
CoolinIDAHO22021
Sawtooth CtyIDAHO22009
PierceIDAHO21992
Libby DamMONTANA22012
St MaryMONTANA22007
St. Mary 2MONTANA22024
Hebgen LakeMONTANA22024
VictorMONTANA22019
GraniteOREGON22004
TwickenhamOREGON22024
OttoWYOMING22008
BasinWYOMING22023

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