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Species · Wyoming · BBS 2025 Release · 1966–2024

Franklin's Gull Population Trend in Wyoming

All statesWetland birds

Franklin's Gull in Wyoming has collapsed: down 95% on the route-weighted index since 1990.

-95%Since 1990TrendPercent 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 →
8Routes 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 →
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 Franklin's Gull Trends in WyomingNotable 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 →

Franklin's Gull has collapsed in Wyoming: down 95% on the route-weighted index since 1990.

Franklin's Gull Survey Routes in Wyoming

Routes recording Franklin's Gull in Wyoming.
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 →
Rock River12919981996
Wilson4119941980
Yellowstone319871987
Fontenelle220221996
Clark120002000
Cody120011990
Bill119991999
Alpine120161994

Franklin's Gull Population Trend in Other States

californiaidahokansasminnesotamontananebraskanorth-dakotaoregonsouth-dakotautah

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