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

Brewer's Sparrow In Great Basin

All regionsGreat BasinGeneralists

Brewer's Sparrow in Great Basin has increased: up 50% on the route-weighted index since 1970.

+50%Since 1970
217Routes In Region
56Years

Notable Signals

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

Forecast

If the recent trend holds, Brewer's Sparrow in Great Basin is projected to stay roughly flat through 2029, near 16 (95% range 7.3–25). A 5-year backtest shows a typical error of ±36.3%, with 100% of held-out values landing inside the 95% band.

+8%Change by 2029
16Projected 2029 index
7.3–2595% range
±36.3%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
2025167.525
2026167.425
2027167.425
2028167.325
2029167.325

Routes In Great Basin

Routes recording Brewer's Sparrow in Great Basin.
PrincetonOREGON1441985
Charleston ReservoirNEVADA1382024
WagontireOREGON1322024
HawthorneNEVADA1062001
Dinner StaNEVADA991993
Bald Mtn.NEVADA862024
BlitzenOREGON861993
DuboisIDAHO792024
MizpahNEVADA752024
Fandango CanOREGON742024
Blitzen 2OREGON722024
Willow SpgOREGON711971
BodieCALIFORNIA702024
Lost RiverIDAHO692024
RanchograndeNEVADA672024
Lookout LakeOREGON671994
Crowley LakeCALIFORNIA662024
Walker CanNEVADA602024
Sheldon NwrNEVADA602019
Blizzard GapOREGON602024
Ruby ValleyNEVADA592001
MidasNEVADA562024
RavendaleCALIFORNIA522024
BuchananOREGON512024
HenryIDAHO501983

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