BirdAnalyst
Species · BCR 10 · BBS 2025 Release · 1966–2024

Olive-sided Flycatcher In Northern Rockies

All regionsNorthern RockiesAerial insectivores

Olive-sided Flycatcher in Northern Rockies has edged down: down 13% on the route-weighted index since 1970.

-13%Since 1970TrendPercent 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 →
126Routes 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 →
56YearsYears 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 →

No notable trend signals for Olive-sided Flycatcher in Northern Rockies. See the full index history below.

Olive-sided Flycatcher In Northern Rockies Population Forecast

If the recent trend holds, Olive-sided Flycatcher in Northern Rockies is projected to rise about 38% by 2029 — from 0.79 in 2024 to a central estimate of 1.1 (95% range 0.51–1.7). A 5-year backtest shows a typical error of ±47.6%, with 100% of held-out values landing inside the 95% band.

+38%Change by 2029TrendPercent 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 →
1.1Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.51–1.795% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±47.6%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Olive-sided Flycatcher in Northern Rockies is projected to rise about 38% by 2029 — from 0.79 in 2024 to a central estimate of 1.1 (95% range 0.51–1.7). A 5-year backtest shows a typical error of ±47.6%, with 100% of held-out values landing inside the 95% band.19682029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20251.10.491.6
20261.10.501.7
20271.10.501.7
20281.10.511.7
20291.10.511.7

Routes In Northern Rockies

Routes recording Olive-sided Flycatcher in Northern Rockies.
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 →
Deer ParkWASHINGTON142006
Lolo PassIDAHO132019
Cape HornIDAHO112024
SulaMONTANA82024
Black Mtn.OREGON82004
Spring LakeWASHINGTON82024
BurgdorfIDAHO72016
Yellow PineIDAHO72016
ArleeMONTANA72024
SkalkahoMONTANA71998
Soda LakeWYOMING72024
Swan LakeMONTANA62024
Hebgen LakeMONTANA62024
Ne EntranceWYOMING62021
GoldenIDAHO52016
PierceIDAHO52007
Whitefish LakeMONTANA52024
DesolationOREGON52007
Colter BayWYOMING51999
Sawtooth CtyIDAHO42014
Marble CreekIDAHO42023
Libby DamMONTANA42015
GreenoughMONTANA42004
LogdellOREGON41972
Eagle CreekOREGON42022

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