BirdAnalyst
Species · South Dakota · BBS 2026 Release · 1966–2025

California Gull Population Trend in South Dakota

All statesWetland birds

California Gull in South Dakota has declined: down 48% on the route-weighted index since 2004.

-48%Since 2004TrendPercent 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 StateSurvey 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 California Gull Trends in South DakotaNotable 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 Gull in South Dakota. See the full index history below.

California Gull Survey Routes in South Dakota

Routes recording California Gull in South Dakota.
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 →
Long Lake420042001
Turton220092009
Fort Pierre120252003

California Gull Population Trend in Other States

alaskacaliforniacoloradoidahominnesotamontananevadanew-mexiconorth-dakotaoregonutahwashingtonwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.