BirdAnalyst
Species · BCR 15 · BBS 2026 Release · 1966–2025

Western Wood-Pewee In Sierra Nevada

All regionsSierra NevadaAerial insectivores

Western Wood-Pewee in Sierra Nevada has declined: down 34% on the route-weighted index since 1970.

-34%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 →
40Routes 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 →
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 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 Western Wood-Pewee in Sierra Nevada. See the full index history below.

Western Wood-Pewee In Sierra Nevada Population Forecast

If the recent trend holds, Western Wood-Pewee in Sierra Nevada is projected to fall about 26% by 2030 — from 21 in 2025 to a central estimate of 16 (95% range 6.5–25). A 5-year backtest shows a typical error of ±35%, with 80% of held-out values landing inside the 95% band.

-26%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 →
16Projected 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 →
6.5–2595% 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 →
±35%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 Sierra Nevada is projected to fall about 26% by 2030 — from 21 in 2025 to a central estimate of 16 (95% range 6.5–25). A 5-year backtest shows a typical error of ±35%, with 80% 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 →
2026177.526
2027167.226
2028167.025
2029166.825
2030166.525

Routes In Sierra Nevada

Routes recording Western Wood-Pewee in Sierra Nevada.
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 →
Little TruckeeCALIFORNIA752025
ChilcootCALIFORNIA582024
Last ChanceCALIFORNIA522019
GeneseeCALIFORNIA472024
PaxtonCALIFORNIA432025
Cottage SpgsCALIFORNIA361975
WoodfordsCALIFORNIA362025
Greenhorn MtCALIFORNIA362008
GoumazCALIFORNIA362011
Eagle LakeCALIFORNIA352025
Pine MountainCALIFORNIA342017
JohnsvilleCALIFORNIA292025
WestvilleCALIFORNIA242025
Meadow ValleyCALIFORNIA232025
LakeshoreCALIFORNIA222024
SattleyCALIFORNIA202025
Lassen ParkCALIFORNIA181989
Bass LakeCALIFORNIA182019
CrestviewCALIFORNIA172025
Pollock PinesCALIFORNIA162025
Tuolumne GroveCALIFORNIA152025
StrawberryCALIFORNIA152019
RivertonCALIFORNIA142025
KernvilleCALIFORNIA142008
Hat CreekCALIFORNIA132018

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