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

Ring-billed Gull In Sierra Nevada

All regionsSierra NevadaWetland birds

Ring-billed Gull in Sierra Nevada has surged: up 202% on the route-weighted index since 1979.

+202%Since 1979TrendPercent 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 →
5Routes 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 →
16YearsYears 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 increasecomputed 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 →

Ring-billed Gull has surged in Sierra Nevada: up 202% on the route-weighted index since 1979.

Routes In Sierra Nevada

Routes recording Ring-billed Gull 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 →
SattleyCALIFORNIA1272012
ChilcootCALIFORNIA102008
LakeshoreCALIFORNIA81999
GeneseeCALIFORNIA41982
Last ChanceCALIFORNIA22009

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