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Species · Idaho · BBS 2026 Release · 1966–2025

Western Wood-Pewee Population Trend in Idaho

All statesAerial insectivores

Western Wood-Pewee in Idaho has risen sharply: up 73% on the route-weighted index since 1970.

+73%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 →
54Routes 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 →
57YearsYears 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 73% 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 18% by 2030 — from 5.4 in 2025 to a central estimate of 4.4 (95% range 2.2–6.6). A 5-year backtest shows a typical error of ±27.1%, with 100% of held-out values landing inside the 95% band.

-18%Change by 2030TrendPercent 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 →
4.4Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
2.2–6.695% 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 →
±27.1%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 18% by 2030 — from 5.4 in 2025 to a central estimate of 4.4 (95% range 2.2–6.6). A 5-year backtest shows a typical error of ±27.1%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20264.22.06.4
20274.22.16.4
20284.32.16.5
20294.32.26.5
20304.42.26.6

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 →
Centerville3520251972
Cascade3019841969
Magic Mtn2920251987
Naples2620251972
Cabarton2620241985
Gifford2420171986
Coolin2020251986
Joel2020241989
Cape Horn1620251986
Challis1420251982
Baker1020241974
Featherville1020251990
Pocatello720191986
Pierce620071993
Almo620251990
Dubois520252006
Picabo520251990
Mivoden420251985
Nezperce420121968
N Fork Cda R420191995
Henry419831983
Burgdorf420251988
Squirrel320251971
Crane Creek320191988
Rochat Divde320251993

Western Wood-Pewee Population Trend in Other States

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Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.