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Species · Utah · BBS 2025 Release · 1966–2024

Williamson's Sapsucker Population Trend in Utah

All statesForest birds

Williamson's Sapsucker in Utah has held roughly steady: down 7% on the route-weighted index since 1988.

-7%Since 1988TrendPercent 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 →
18Routes 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 →
33YearsYears 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 UtahNotable 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 Williamson's Sapsucker in Utah. See the full index history below.

Williamson's Sapsucker Population Forecast in Utah

If the recent trend holds, Williamson's Sapsucker in Utah is projected to fall about 44% by 2029 — from 0.17 in 2024 to a central estimate of 0.10 (95% range 0.00–0.23). A 5-year backtest shows a typical error of ±47.1%, with 100% of held-out values landing inside the 95% band.

-44%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 →
0.10Projected 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 →
0.00–0.2395% 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 →
±47.1%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 Utah is projected to fall about 44% by 2029 — from 0.17 in 2024 to a central estimate of 0.10 (95% range 0.00–0.23). A 5-year backtest shows a typical error of ±47.1%, with 100% of held-out values landing inside the 95% band.19732029
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 →
20250.100.000.23
20260.100.000.23
20270.100.000.23
20280.100.000.23
20290.100.000.23

Williamson's Sapsucker Survey Routes in Utah

Routes recording Williamson's Sapsucker in Utah.
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 →
Dixie Nf620241999
Beck319731973
Lost Cr. Res320092009
Red Spur Mtn.320232002
Heber Mtn.320221999
Navajo Lake220241987
Alton120112001
Moon Lake 2120182017
Skyline Driv120021995
Richfield120142014
Ant Flat-Ogden Can120212021
Grizzly Rdge120221997
Wasatch Nf120231988
Logan Canyon120162016
Bryce Canyon120242005
Woodruff120242007
Ferron120162016
M Warner Res119981993

Williamson's Sapsucker Population Trend in Other States

arizonacaliforniacoloradoidahomontananevadanew-mexicooregonwashingtonwyoming

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