BirdAnalyst
Species · BCR 10 · BBS 2026 Release · 1966–2025

Williamson's Sapsucker In Northern Rockies

All regionsNorthern RockiesForest birds

Williamson's Sapsucker in Northern Rockies has surged: up 364% on the route-weighted index since 1972.

+364%Since 1972TrendPercent 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 →
84Routes 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 →
52YearsYears 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 →

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 Northern Rockies: up 364% on the route-weighted index since 1972.

Williamson's Sapsucker In Northern Rockies Population Forecast

If the recent trend holds, Williamson's Sapsucker in Northern Rockies is projected to stay roughly flat through 2030, near 0.39 (95% range 0.18–0.59). A 5-year backtest shows a typical error of ±27.4%, with 100% of held-out values landing inside the 95% band.

+5%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 →
0.39Projected 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 →
0.18–0.5995% 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 →
±27.4%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 Northern Rockies is projected to stay roughly flat through 2030, near 0.39 (95% range 0.18–0.59). A 5-year backtest shows a typical error of ±27.4%, 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 →
20260.370.170.57
20270.370.170.58
20280.380.180.58
20290.380.180.59
20300.390.180.59

Routes In Northern Rockies

Routes recording Williamson's Sapsucker in Northern Rockies.
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 →
OchocoOREGON91982
Hash RockOREGON92025
Omak CreekWASHINGTON92024
SilviesOREGON82024
GreenoughMONTANA72004
Greenoagh 2MONTANA72011
Silver CreekOREGON62025
BarnhouseOREGON52025
Donelly 2OREGON52025
CloverlandWASHINGTON52025
PierceIDAHO42003
LogdellOREGON42022
Mount VernonOREGON42024
Sawtooth City 2IDAHO32019
St RegisMONTANA31982
Howard Mdws.OREGON32025
UnityOREGON32025
MonumentOREGON32025
AveryIDAHO21991
Lolo PassIDAHO22007
AlturasIDAHO21985
CoolinIDAHO22018
CabartonIDAHO22003
Sawtooth CtyIDAHO22013
BurgdorfIDAHO22000

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