BirdAnalyst
Species · BCR 9 · BBS 2025 Release · 1966–2024

Western Grebe In Great Basin

All regionsGreat BasinWetland birds

Western Grebe in Great Basin has collapsed: down 92% on the route-weighted index since 1988.

-92%Since 1988
53Routes In Region
38Years

Notable Signals

long arc declinecomputed index

Western Grebe has collapsed in Great Basin: down 92% on the route-weighted index since 1988.

Forecast

If the recent trend holds, Western Grebe in Great Basin is projected to rise about 755% by 2029 — from 0.16 in 2024 to a central estimate of 1.3 (95% range 0.00–5.5). A 5-year backtest shows a typical error of ±871.5%, with 100% of held-out values landing inside the 95% band.

+755%Change by 2029
1.3Projected 2029 index
0.00–5.595% range
±871.5%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
20251.60.005.8
20261.60.005.7
20271.50.005.6
20281.40.005.5
20291.30.005.5

Routes In Great Basin

Routes recording Western Grebe in Great Basin.
Iron GateCALIFORNIA1242019
DorrisCALIFORNIA562019
Modoc PointOREGON332018
Bear RiverUTAH222023
Blacks CreekIDAHO121996
PromontoryUTAH111998
Harney LakeOREGON91995
Fish LakeOREGON62024
Catlow RimOREGON52024
Hanford SiteWASHINGTON51996
Blizzard GapOREGON42018
Warner VallyOREGON42024
MadelineCALIFORNIA32017
Iron SpringsIDAHO32024
Modoc Point 2OREGON32024
LeamingtonUTAH32014
MacdoelCALIFORNIA21998
Clear Lk ResCALIFORNIA22018
Pasadena ValIDAHO22014
Cedar HillIDAHO22016
Alvord LakeOREGON22019
Moses LakeWASHINGTON22016
Horn RapidsWASHINGTON22021
NubieberCALIFORNIA12017
IngallsCALIFORNIA11999

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