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

Brewer's Blackbird In Great Basin

All regionsGreat BasinGeneralists

Brewer's Blackbird in Great Basin has declined: down 28% on the route-weighted index since 1970.

-28%Since 1970
247Routes In Region
56Years

Notable Signals

No notable trend signals for Brewer's Blackbird in Great Basin. See the full index history below.

Forecast

If the recent trend holds, Brewer's Blackbird in Great Basin is projected to fall about 25% by 2029 — from 26 in 2024 to a central estimate of 19 (95% range 1.8–37). A 5-year backtest shows a typical error of ±21.6%, with 100% of held-out values landing inside the 95% band.

-25%Change by 2029
19Projected 2029 index
1.8–3795% range
±21.6%Backtest error
19682029
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
2025224.139
2026213.539
2027202.938
2028202.337
2029191.837

Routes In Great Basin

Routes recording Brewer's Blackbird in Great Basin.
DorrisCALIFORNIA6462019
LikelyCALIFORNIA5072024
CedarvilleCALIFORNIA3282024
UmatillaOREGON3032023
Toiyabe NfNEVADA2632024
Modoc Point 2OREGON1772024
MacdoelCALIFORNIA1602019
JosephOREGON1522024
MesaWASHINGTON1512008
PrincetonOREGON1421985
Modoc PointOREGON1342018
Columbia NwrWASHINGTON1282022
Ruby Valley 2NEVADA1242024
Malheur NwrOREGON1212022
NubieberCALIFORNIA1152018
Crowley LakeCALIFORNIA972024
Fandango CanOREGON972024
HarwoodWASHINGTON951997
OthelloWASHINGTON911991
Glenns FerryIDAHO841986
RavendaleCALIFORNIA752024
Catlow RimOREGON752024
GardnervilleNEVADA732012
YakimaWASHINGTON732024
Walla WallaWASHINGTON711993

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