BirdAnalyst
Species · Idaho · BBS 2025 Release · 1966–2024

Bufflehead Population Trend in Idaho

All statesWaterfowl

Bufflehead in Idaho has declined: down 43% on the route-weighted index since 1987.

-43%Since 1987TrendPercent 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 →
10Routes 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 →
17YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Bufflehead Trends in IdahoNotable 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 Bufflehead in Idaho. See the full index history below.

Bufflehead Survey Routes in Idaho

Routes recording Bufflehead in Idaho.
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 →
Salmon River820022002
Naples620161981
Iron Springs420181999
Lolo Pass320192000
Carey219991999
Springfield219781978
Blackft Res119871987
Cabarton120232002
Burgdorf120032003
Pasadena Val119911991

Bufflehead Population Trend in Other States

alaskacaliforniacoloradominnesotamontananevadanorth-dakotaoregonsouth-dakotautahwashingtonwisconsinwyoming

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