BirdAnalyst
Species · Wyoming · BBS 2026 Release · 1966–2025

Common Loon Population Trend in Wyoming

All statesWetland birds

Common Loon in Wyoming has declined: down 43% on the route-weighted index since 1991.

-43%Since 1991TrendPercent 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 →
6Routes 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 →
13YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Common Loon 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 →

No notable trend signals for Common Loon in Wyoming. See the full index history below.

Common Loon Survey Routes in Wyoming

Routes recording Common Loon 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 →
Yellowstone220241991
Crazy Woman220102010
Alpine219991999
West Thumb219821982
Fiddler Lk120161979
Fontenelle120021982

Common Loon Population Trend in Other States

alaskaidahomainemassachusettsmichiganminnesotamontananew-hampshirenew-yorknorth-dakotaoregonvermontwashingtonwisconsin

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