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

California Thrasher In Great Basin

All regionsGreat BasinGeneralists

California Thrasher in Great Basin has held roughly steady: down 4% on the route-weighted index since 1995.

-4%Since 1995TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
3Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
12YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for California Thrasher in Great Basin. See the full index history below.

Routes In Great Basin

Routes recording California Thrasher in Great Basin.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
DorrisCALIFORNIA32011
Deep SpringsCALIFORNIA11975
Iron GateCALIFORNIA12017

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