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

Pied-billed Grebe In Northern Rockies

All regionsNorthern RockiesWetland birds

Pied-billed Grebe in Northern Rockies has declined: down 39% on the route-weighted index since 1973.

-39%Since 1973
49Routes In Region
53Years

Notable Signals

No notable trend signals for Pied-billed Grebe in Northern Rockies. See the full index history below.

Forecast

If the recent trend holds, Pied-billed Grebe in Northern Rockies is projected to fall about 29% by 2029 — from 0.16 in 2024 to a central estimate of 0.11 (95% range 0.00–0.25). A 5-year backtest shows a typical error of ±71.7%, with 100% of held-out values landing inside the 95% band.

-29%Change by 2029
0.11Projected 2029 index
0.00–0.2595% range
±71.7%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
20250.120.000.26
20260.110.000.26
20270.110.000.26
20280.110.000.25
20290.110.000.25

Routes In Northern Rockies

Routes recording Pied-billed Grebe in Northern Rockies.
Rawlins 2WYOMING122016
NaplesIDAHO92024
KalispellMONTANA42024
Great DivideCOLORADO32016
AugustaMONTANA32024
Saleratus CrUTAH32016
TensleepWYOMING32015
Browns ParkCOLORADO22005
CabartonIDAHO22004
RandolphUTAH22021
ChewelahWASHINGTON22008
Omak CreekWASHINGTON22024
LamontWYOMING21999
Green RiverWYOMING21982
LayCOLORADO12000
MivodenIDAHO12006
CentervilleIDAHO12008
St MaryMONTANA11995
PolsonMONTANA11994
ArleeMONTANA11990
ChestnutMONTANA12024
BeaverheadMONTANA12024
GlenMONTANA12019
Willow Creek 2MONTANA12006
Swan LakeMONTANA12018

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