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

Black Swift Population Trend in Idaho

All statesAerial insectivores

Black Swift in Idaho has fallen sharply: down 68% on the route-weighted index since 1989.

-68%Since 1989TrendPercent 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 →
12YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Black Swift 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 →

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 →

Black Swift has fallen sharply in Idaho: down 68% on the route-weighted index since 1989.

Black Swift Survey Routes in Idaho

Routes recording Black Swift 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 →
Burgdorf419891989
Naples420111973
Coolin120012001

Black Swift Population Trend in Other States

alaskacaliforniacoloradomontananew-mexicooregonutahwashington

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