BirdAnalyst
Species · BCR 32 · BBS 2025 Release · 1966–2024

Western Grebe In Coastal California

All regionsCoastal CaliforniaWetland birds

Western Grebe in Coastal California has risen sharply: up 67% on the route-weighted index since 1988.

+67%Since 1988
19Routes In Region
37Years

Notable Signals

long arc increasecomputed index

Western Grebe has risen sharply in Coastal California: up 67% on the route-weighted index since 1988.

Forecast

If the recent trend holds, Western Grebe in Coastal California is projected to fall about 56% by 2029 — from 1.0 in 2024 to a central estimate of 0.44 (95% range 0.00–1.2). A 5-year backtest shows a typical error of ±233%, with 100% of held-out values landing inside the 95% band.

-56%Change by 2029
0.44Projected 2029 index
0.00–1.295% range
±233%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
20250.430.001.2
20260.430.001.2
20270.440.001.2
20280.440.001.2
20290.440.001.2

Routes In Coastal California

Routes recording Western Grebe in Coastal California.
Bartlett SpsCALIFORNIA292018
CoyoteCALIFORNIA202024
San YsidroCALIFORNIA161990
HughsonCALIFORNIA132024
CoalingaCALIFORNIA82001
Harbor Lake 2CALIFORNIA52024
South LakeCALIFORNIA52006
Glen Ellen 3CALIFORNIA52024
OrovilleCALIFORNIA32024
Morro BayCALIFORNIA21992
FolsomCALIFORNIA22009
AdelaidaCALIFORNIA21993
Elizabeth LkCALIFORNIA22016
RumseyCALIFORNIA12006
Foster ParkCALIFORNIA11994
FairfaxCALIFORNIA12005
Lake BerryessaCALIFORNIA12024
ZamoraCALIFORNIA12019
CopperopolisCALIFORNIA12022

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