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

American Dipper In Coastal California

All regionsCoastal CaliforniaGeneralists

American Dipper in Coastal California has increased: up 50% on the route-weighted index since 1978.

+50%Since 1978TrendPercent 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 →
7Routes 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 →
14YearsYears 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 American Dipper in Coastal California. See the full index history below.

Routes In Coastal California

Routes recording American Dipper in Coastal California.
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 →
FallsvaleCALIFORNIA31975
Green ValleyCALIFORNIA22012
Foster ParkCALIFORNIA11978
Lake SuccessCALIFORNIA11981
Waterman GapCALIFORNIA12009
PescaderoCALIFORNIA12008
Cal Hot SpgsCALIFORNIA12008

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