BirdAnalyst
Species · Oregon · BBS 2025 Release · 1966–2024

Williamson's Sapsucker Population Trend in Oregon

All statesForest birds

Williamson's Sapsucker in Oregon has surged: up 314% on the route-weighted index since 1971.

+314%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 →
44Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
54YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Williamson's Sapsucker Trends in OregonNotable 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 increasecomputed 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 →

Williamson's Sapsucker has surged in Oregon: up 314% on the route-weighted index since 1971.

Williamson's Sapsucker Population Forecast in Oregon

If the recent trend holds, Williamson's Sapsucker in Oregon is projected to stay roughly flat through 2029, near 0.63 (95% range 0.27–0.98). A 5-year backtest shows a typical error of ±17.6%, with 100% of held-out values landing inside the 95% band.

+4%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 →
0.63Projected 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 →
0.27–0.9895% 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 →
±17.6%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, Williamson's Sapsucker in Oregon is projected to stay roughly flat through 2029, near 0.63 (95% range 0.27–0.98). A 5-year backtest shows a typical error of ±17.6%, 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 →
20250.600.240.96
20260.610.250.96
20270.610.260.97
20280.620.260.98
20290.630.270.98

Williamson's Sapsucker Survey Routes in Oregon

Routes recording Williamson's Sapsucker in Oregon.
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 →
Barnes Val1119871984
Ochoco919821975
Hash Rock920241983
Silvies820241994
Barnhouse720241998
Silver Creek620241984
Sisters620241998
Donelly 2520242018
Desolation520071993
Lakeview520241996
Logdell420221987
Wizard Falls420181999
Mount Vernon420241986
Shellrock320152014
Albee320231975
Summit Pr220141984
Emigrant Lk219801980
Badger Creek220232005
Unity220001993
Eagle Creek220211994
Davis Lake220242000
Flora120231986
Lapham Res.119951995
Wickiup120191987
Dell Spring119991968

Williamson's Sapsucker Population Trend in Other States

arizonacaliforniacoloradoidahomontananevadanew-mexicoutahwashingtonwyoming

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