BirdAnalyst
Species · BCR 15 · BBS 2025 Release · 1966–2024

Williamson's Sapsucker In Sierra Nevada

All regionsSierra NevadaForest birds

Williamson's Sapsucker in Sierra Nevada has increased: up 35% on the route-weighted index since 1975.

+35%Since 1975
18Routes In Region
43Years

Notable Signals

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

Forecast

If the recent trend holds, Williamson's Sapsucker in Sierra Nevada is projected to rise about 312% by 2029 — from 0.10 in 2024 to a central estimate of 0.43 (95% range 0.11–0.76). A 5-year backtest shows a typical error of ±130.5%, with 80% of held-out values landing inside the 95% band.

+312%Change by 2029
0.43Projected 2029 index
0.11–0.7695% range
±130.5%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
20250.410.080.74
20260.420.090.74
20270.420.100.75
20280.430.100.76
20290.430.110.76

Routes In Sierra Nevada

Routes recording Williamson's Sapsucker in Sierra Nevada.
LakeshoreCALIFORNIA42004
Eagle LakeCALIFORNIA21985
DardanelleCALIFORNIA22004
Tuolumne GroveCALIFORNIA22014
DownievilleCALIFORNIA21975
GoumazCALIFORNIA22011
Little TruckeeCALIFORNIA22023
Pine MountainCALIFORNIA22017
CrestviewCALIFORNIA22024
Lassen ParkCALIFORNIA11976
WoodfordsCALIFORNIA12023
LumberyardCALIFORNIA12008
SattleyCALIFORNIA12019
RivertonCALIFORNIA12010
Hat CreekCALIFORNIA11998
PaxtonCALIFORNIA12017
Pollock PinesCALIFORNIA12013
Last ChanceCALIFORNIA12019

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