BirdAnalyst
Species · BCR 16 · BBS 2025 Release · 1966–2024

Western Grebe In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauWetland birds

Western Grebe in Southern Rockies / Colorado Plateau has surged: up 202% on the route-weighted index since 1990.

+202%Since 1990
29Routes In Region
36Years

Notable Signals

long arc increasecomputed index

Western Grebe has surged in Southern Rockies / Colorado Plateau: up 202% on the route-weighted index since 1990.

Forecast

If the recent trend holds, Western Grebe in Southern Rockies / Colorado Plateau is projected to rise about 36% by 2029 — from 0.32 in 2024 to a central estimate of 0.43 (95% range 0.17–0.69). A 5-year backtest shows a typical error of ±58.7%, with 100% of held-out values landing inside the 95% band.

+36%Change by 2029
0.43Projected 2029 index
0.17–0.6995% range
±58.7%Backtest error
19862029
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
20250.400.130.66
20260.410.140.67
20270.410.150.68
20280.420.160.69
20290.430.170.69

Routes In Southern Rockies / Colorado Plateau

Routes recording Western Grebe in Southern Rockies / Colorado Plateau.
GuffeyCOLORADO182024
M Warner ResUTAH102024
DulceNEW-MEXICO62024
Cortez 2COLORADO52017
BeckUTAH51987
KamasUTAH52024
BrookhurstWYOMING42015
Stillwater PassCOLORADO32006
WaldenCOLORADO22016
AlamosaCOLORADO22014
San LuisCOLORADO22024
Groundhog RsCOLORADO22012
FerronUTAH22022
MonticelloUTAH22005
HarmonyCOLORADO12007
FalfaCOLORADO12014
TarryallCOLORADO12018
CortezCOLORADO12008
ThomasvilleCOLORADO12006
DinosaurCOLORADO12016
Gold HillCOLORADO12001
Rifle FallsCOLORADO12014
Stinking Lk.NEW-MEXICO11992
Navajo LakeUTAH12011
JensenUTAH12002

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