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

Western Wood-Pewee Population Trend in Idaho

All statesAerial insectivores

Western Wood-Pewee in Idaho has risen sharply: up 62% on the route-weighted index since 1970.

+62%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 →
53Routes 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 →
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 Western Wood-Pewee 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 increasecomputed 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 →

Western Wood-Pewee has risen sharply in Idaho: up 62% on the route-weighted index since 1970.

Western Wood-Pewee Population Forecast in Idaho

If the recent trend holds, Western Wood-Pewee in Idaho is projected to fall about 13% by 2029 — from 4.9 in 2024 to a central estimate of 4.2 (95% range 2.1–6.4). A 5-year backtest shows a typical error of ±25.1%, with 100% of held-out values landing inside the 95% band.

-13%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 →
4.2Projected 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 →
2.1–6.495% 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 →
±25.1%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, Western Wood-Pewee in Idaho is projected to fall about 13% by 2029 — from 4.9 in 2024 to a central estimate of 4.2 (95% range 2.1–6.4). A 5-year backtest shows a typical error of ±25.1%, 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 →
20254.01.96.2
20264.11.96.3
20274.12.06.3
20284.22.06.4
20294.22.16.4

Western Wood-Pewee Survey Routes in Idaho

Routes recording Western Wood-Pewee 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 →
Cabarton3720231985
Cascade3019841969
Magic Mtn2820241987
Gifford2420171986
Joel2020241989
Naples1820241972
Centerville1520191972
Cape Horn1420241986
Featherville1120241990
Baker1020241974
Coolin1020241986
Mivoden820231985
Challis820241982
Pocatello720191986
Pierce620071993
Rochat Divde620231993
Almo620221990
Nezperce420121968
N Fork Cda R420191995
Henry419831983
Crane Creek320191988
Silver City320221995
Sawtooth Cty320131988
Pasadena Val319911987
Golden220091987

Western Wood-Pewee Population Trend in Other States

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