BirdAnalyst
Species · BCR 15 · BBS 2025 Release · 1966–2024

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 →
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 →

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 28% by 2029 — from 22 in 2024 to a central estimate of 16 (95% range 6.4–25). A 5-year backtest shows a typical error of ±34.4%, with 80% of held-out values landing inside the 95% band.

-28%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 →
16Projected 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 →
6.4–2595% 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 →
±34.4%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 28% by 2029 — from 22 in 2024 to a central estimate of 16 (95% range 6.4–25). A 5-year backtest shows a typical error of ±34.4%, with 80% 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 →
2025177.426
2026167.126
2027166.925
2028166.625
2029166.425

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 TruckeeCALIFORNIA802023
ChilcootCALIFORNIA582024
Eagle LakeCALIFORNIA552024
Last ChanceCALIFORNIA522019
GeneseeCALIFORNIA472024
WoodfordsCALIFORNIA412024
Cottage SpgsCALIFORNIA361975
Greenhorn MtCALIFORNIA362008
GoumazCALIFORNIA362011
Pine MountainCALIFORNIA342017
PaxtonCALIFORNIA332024
JohnsvilleCALIFORNIA282024
SattleyCALIFORNIA222024
LakeshoreCALIFORNIA222024
WestvilleCALIFORNIA192024
Lassen ParkCALIFORNIA181989
Bass LakeCALIFORNIA182019
CrestviewCALIFORNIA162024
StrawberryCALIFORNIA152019
KernvilleCALIFORNIA142008
Hat CreekCALIFORNIA132018
Meadow ValleyCALIFORNIA132024
Tuolumne GroveCALIFORNIA122024
Tahoe NfCALIFORNIA121994
Kings CanyonCALIFORNIA112024

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