BirdAnalyst
Species · BCR 9 · BBS 2025 Release · 1966–2024

Least Flycatcher In Great Basin

All regionsGreat BasinAerial insectivores

Least Flycatcher in Great Basin has fallen sharply: down 55% on the route-weighted index since 1990.

-55%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 →
17Routes In RegionSurvey 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 SignalsNotable 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 →

Least Flycatcher has fallen sharply in Great Basin: down 55% on the route-weighted index since 1990.

Routes In Great Basin

Routes recording Least Flycatcher in Great Basin.
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 →
NewhalemWASHINGTON81986
Magic MtnIDAHO61990
Turnbull NwrWASHINGTON62023
BakerIDAHO22010
EwanWASHINGTON22007
NighthawkWASHINGTON22010
GiffordIDAHO12017
LeadoreIDAHO12012
JoelIDAHO12023
PaisleyOREGON12024
Goose Creek Mtn.UTAH12011
ReardanWASHINGTON12005
WinthropWASHINGTON11983
TonasketWASHINGTON12006
WilburWASHINGTON11993
YakimaWASHINGTON12010
Lake ChelanWASHINGTON12023

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