BirdAnalyst
Species · BCR 15 · BBS 2025 Release · 1966–2024

Wilson's Phalarope In Sierra Nevada

All regionsSierra NevadaShorebirds

Wilson's Phalarope in Sierra Nevada has fallen sharply: down 52% on the route-weighted index since 1976.

-52%Since 1976TrendPercent 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 →
15YearsYears 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 →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Wilson's Phalarope has fallen sharply in Sierra Nevada: down 51% on the route-weighted index since 1976.

Routes In Sierra Nevada

Routes recording Wilson's Phalarope in Sierra Nevada.
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 →
Eagle LakeCALIFORNIA52007
SattleyCALIFORNIA32005
GoumazCALIFORNIA12011

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