BirdAnalyst
Species · BCR 32 · BBS 2025 Release · 1966–2024

Western Wood-Pewee In Coastal California

All regionsCoastal CaliforniaAerial insectivores

Western Wood-Pewee in Coastal California has fallen sharply: down 67% on the route-weighted index since 1970.

-67%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 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 →

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 →

Western Wood-Pewee has fallen sharply in Coastal California: down 67% on the route-weighted index since 1970.

Western Wood-Pewee In Coastal California Population Forecast

If the recent trend holds, Western Wood-Pewee in Coastal California is projected to rise about 84% by 2029 — from 1.4 in 2024 to a central estimate of 2.6 (95% range 0.20–5.1). A 5-year backtest shows a typical error of ±91.1%, with 100% of held-out values landing inside the 95% band.

+84%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 →
2.6Projected 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 →
0.20–5.195% 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 →
±91.1%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 Coastal California is projected to rise about 84% by 2029 — from 1.4 in 2024 to a central estimate of 2.6 (95% range 0.20–5.1). A 5-year backtest shows a typical error of ±91.1%, 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 →
20252.90.455.3
20262.80.395.2
20272.80.335.2
20282.70.265.1
20292.60.205.1

Routes In Coastal California

Routes recording Western Wood-Pewee in Coastal California.
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 →
Lake HemetCALIFORNIA321986
White RiverCALIFORNIA321992
FallsvaleCALIFORNIA291981
ValyermoCALIFORNIA252019
Mt PinosCALIFORNIA242004
PowayCALIFORNIA161979
Big BearCALIFORNIA151986
Angelus OaksCALIFORNIA152017
Hough SpringsCALIFORNIA142007
San Benito Mtn.CALIFORNIA142009
TehamaCALIFORNIA112022
Tres Pinos 2CALIFORNIA112011
StonyfordCALIFORNIA112018
Sawmill MtnCALIFORNIA92022
Mesa GrandeCALIFORNIA92024
Lake BerryessaCALIFORNIA92024
Cal Hot SpgsCALIFORNIA92019
RumseyCALIFORNIA82008
Green ValleyCALIFORNIA82023
ZamoraCALIFORNIA82019
CoalingaCALIFORNIA72014
CohassetCALIFORNIA72024
Mt LagunaCALIFORNIA71987
PenningtonCALIFORNIA62024
Mt Pinos 2CALIFORNIA62024

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