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Species · Washington · BBS 2025 Release · 1966–2024

Williamson's Sapsucker Population Trend in Washington

All statesForest birds

Williamson's Sapsucker in Washington has surged: up 476% on the route-weighted index since 1982.

+476%Since 1982
15Routes In State
42Years

Notable Williamson's Sapsucker Trends in Washington

long arc increasecomputed index

Williamson's Sapsucker has surged in Washington: up 476% on the route-weighted index since 1982.

Williamson's Sapsucker Population Forecast in Washington

If the recent trend holds, Williamson's Sapsucker in Washington is projected to fall about 38% by 2029 — from 0.56 in 2024 to a central estimate of 0.35 (95% range 0.20–0.50). A 5-year backtest shows a typical error of ±40.1%, with 60% of held-out values landing inside the 95% band.

-38%Change by 2029
0.35Projected 2029 index
0.20–0.5095% range
±40.1%Backtest error
19802029
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
20250.320.170.47
20260.330.180.48
20270.340.180.49
20280.340.190.49
20290.350.200.50

Williamson's Sapsucker Survey Routes in Washington

Routes recording Williamson's Sapsucker in Washington.
Omak Creek920241996
Spring Lake620241985
Cloverland620241997
Carlton520221995
Blewett Pass520241992
E. Mt. Adams420241997
Ronald120241991
Mazama120012001
Twisp120052005
Laurier120162004
L. Wenatchee120021994
Rimrock120241980
Curlew119921992
Winthrop119831983
Twin Lakes119871987

Williamson's Sapsucker Population Trend in Other States

arizonacaliforniacoloradoidahomontananevadanew-mexicooregonutahwyoming

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