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Species · Washington · BBS 2025 Release · 1966–2024

Western Wood-Pewee Population Trend in Washington

All statesAerial insectivores

Western Wood-Pewee in Washington has held roughly steady: down 7% on the route-weighted index since 1970.

-7%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 →
103Routes 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 WashingtonNotable 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 Western Wood-Pewee in Washington. See the full index history below.

Western Wood-Pewee Population Forecast in Washington

If the recent trend holds, Western Wood-Pewee in Washington is projected to rise about 17% by 2029 — from 9.5 in 2024 to a central estimate of 11 (95% range 7.4–15). A 5-year backtest shows a typical error of ±8%, with 100% of held-out values landing inside the 95% band.

+17%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 →
11Projected 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 →
7.4–1595% 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 →
±8%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 Washington is projected to rise about 17% by 2029 — from 9.5 in 2024 to a central estimate of 11 (95% range 7.4–15). A 5-year backtest shows a typical error of ±8%, 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 →
2025117.115
2026117.215
2027117.215
2028117.315
2029117.415

Western Wood-Pewee Survey Routes in Washington

Routes recording Western Wood-Pewee in Washington.
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 →
Leavenworth5120241982
Twisp4620241969
Deer Park4620151994
Turnbull Nwr4620231993
Chewelah4320211977
Ewan3720191983
Laurier3220221997
Waitsburg3020041994
L Pend O Nwr3020241995
Pe Ell2620231993
Lake Chelan2620241988
L. Wenatchee2220241993
Keller2020071968
Spring Lake1920241982
Malden1920241998
Pomeroy1920241992
Cloverland1920241993
Northport1820241996
Snowden1720241972
Everett1720241975
Omak Creek1720241996
Mukilteo1720241993
Carnation1620241988
Ellensburg1520241981
Ardenvoir1419871968

Western Wood-Pewee Population Trend in Other States

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