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Species · California · BBS 2025 Release · 1966–2024

Williamson's Sapsucker Population Trend in California

All statesForest birds

Williamson's Sapsucker in California has increased: up 40% on the route-weighted index since 1975.

+40%Since 1975
32Routes In State
47Years

Notable Williamson's Sapsucker Trends in California

No notable trend signals for Williamson's Sapsucker in California. See the full index history below.

Williamson's Sapsucker Population Forecast in California

If the recent trend holds, Williamson's Sapsucker in California is projected to stay roughly flat through 2029, near 0.12 (95% range 0.03–0.21). A 5-year backtest shows a typical error of ±219.3%, with 60% of held-out values landing inside the 95% band.

n/aChange by 2029
0.12Projected 2029 index
0.03–0.2195% range
±219.3%Backtest error
19722029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.110.020.20
20260.110.020.20
20270.110.020.20
20280.120.020.21
20290.120.030.21

Williamson's Sapsucker Survey Routes in California

Routes recording Williamson's Sapsucker in California.
Lakeshore420041972
Hackamore320102000
Green Valley220152015
Eagle Lake219851985
Dardanelle220041973
Crowley Lake220161975
Tuolumne Grove220142000
Goumaz220111997
Little Truckee220231997
Pine Mountain220171998
Crestview220241997
Downieville219751975
Valyermo220131995
Nubieber120021999
Lassen Park119761976
Whiskeytown120062006
Tionesta120211997
Sattley120191997
Paxton120172017
Pollock Pines120132012
Davis Creek119941994
Macdoel120112011
Medicine Mtn.120212001
Mt Shasta120121976
Cedarville120151978

Williamson's Sapsucker Population Trend in Other States

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