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

Common Loon In Northern Rockies

All regionsNorthern RockiesWetland birds

Common Loon in Northern Rockies has edged down: down 23% on the route-weighted index since 1979.

-23%Since 1979
28Routes In Region
45Years

Notable Signals

No notable trend signals for Common Loon in Northern Rockies. See the full index history below.

Forecast

If the recent trend holds, Common Loon in Northern Rockies is projected to fall about 23% by 2029 — from 0.06 in 2024 to a central estimate of 0.04 (95% range 0.00–0.09). A 5-year backtest shows a typical error of ±53.4%, with 100% of held-out values landing inside the 95% band.

-23%Change by 2029
0.04Projected 2029 index
0.00–0.0995% range
±53.4%Backtest error
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 index95% low95% high
20250.040.000.09
20260.040.000.09
20270.040.000.09
20280.040.000.09
20290.040.000.09

Routes In Northern Rockies

Routes recording Common Loon in Northern Rockies.
East Glacier ParkMONTANA32017
Inside RoadMONTANA32024
LaurierWASHINGTON32022
Pablo Res.MONTANA22016
Logan PassMONTANA22013
West ThumbWYOMING21982
Crazy WomanWYOMING22010
AlpineWYOMING21999
NaplesIDAHO11981
CascadeIDAHO11983
CabartonIDAHO12008
Libby DamMONTANA12015
KalispellMONTANA12013
St MaryMONTANA12008
ArleeMONTANA12024
Painted RockMONTANA11999
NoxonMONTANA12015
St. Mary 2MONTANA12024
Swan LakeMONTANA12024
Hebgen LakeMONTANA12024
KellerWASHINGTON11971
Twin LakesWASHINGTON12024
CusickWASHINGTON12000
CurlewWASHINGTON12013
Sullivan Lake 2WASHINGTON12015

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