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

White-headed Woodpecker In Sierra Nevada

All regionsSierra NevadaForest birds

White-headed Woodpecker in Sierra Nevada has edged down: down 18% on the route-weighted index since 1971.

-18%Since 1971TrendPercent 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 →
38Routes 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 White-headed Woodpecker in Sierra Nevada. See the full index history below.

White-headed Woodpecker In Sierra Nevada Population Forecast

If the recent trend holds, White-headed Woodpecker in Sierra Nevada is projected to stay roughly flat through 2030, near 1.9 (95% range 0.89–3.0). A 5-year backtest shows a typical error of ±14.6%, with 100% of held-out values landing inside the 95% band.

-3%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 →
1.9Projected 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 →
0.89–3.095% 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 →
±14.6%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, White-headed Woodpecker in Sierra Nevada is projected to stay roughly flat through 2030, near 1.9 (95% range 0.89–3.0). A 5-year backtest shows a typical error of ±14.6%, with 100% of held-out values landing inside the 95% band.19692030
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 →
20261.90.883.0
20271.90.883.0
20281.90.883.0
20291.90.893.0
20301.90.893.0

Routes In Sierra Nevada

Routes recording White-headed Woodpecker 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 →
ChilcootCALIFORNIA112024
RivertonCALIFORNIA92025
WestvilleCALIFORNIA52025
Greenhorn MtCALIFORNIA52008
Hat CreekCALIFORNIA52018
GoumazCALIFORNIA52011
Cottage SpgsCALIFORNIA41975
JohnsvilleCALIFORNIA42025
WoodfordsCALIFORNIA42025
Little TruckeeCALIFORNIA42025
Forest HillCALIFORNIA42025
Lassen ParkCALIFORNIA31989
Chaos CraterCALIFORNIA32019
Eagle LakeCALIFORNIA22024
Bass LakeCALIFORNIA21981
LumberyardCALIFORNIA22025
ChesterCALIFORNIA22017
CoultervilleCALIFORNIA22014
Pine MountainCALIFORNIA22017
Last ChanceCALIFORNIA22019
DardanelleCALIFORNIA12018
Silver CityCALIFORNIA12012
Kings CanyonCALIFORNIA12024
Tuolumne GroveCALIFORNIA12025
SattleyCALIFORNIA12025

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