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

Acorn Woodpecker In Sierra Nevada

All regionsSierra NevadaForest birds

Acorn Woodpecker in Sierra Nevada has fallen sharply: down 68% on the route-weighted index since 1970.

-68%Since 1970
24Routes In Region
56Years

Notable Signals

long arc declinecomputed index

Acorn Woodpecker has fallen sharply in Sierra Nevada: down 68% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Acorn Woodpecker in Sierra Nevada is projected to stay roughly flat through 2029, near 3.9 (95% range 0.00–11). A 5-year backtest shows a typical error of ±22.5%, with 100% of held-out values landing inside the 95% band.

-1%Change by 2029
3.9Projected 2029 index
0.00–1195% range
±22.5%Backtest error
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 index95% low95% high
20254.40.0012
20264.30.0011
20274.10.0011
20284.00.0011
20293.90.0011

Routes In Sierra Nevada

Routes recording Acorn Woodpecker in Sierra Nevada.
Bass LakeCALIFORNIA902019
Greenhorn MtCALIFORNIA602008
Silver CityCALIFORNIA492013
WawonaCALIFORNIA302024
CoultervilleCALIFORNIA242019
Higgins CornCALIFORNIA192024
Cottage SpgsCALIFORNIA141975
Tuolumne GroveCALIFORNIA142024
KernvilleCALIFORNIA122008
Forest HillCALIFORNIA82022
Kings CanyonCALIFORNIA42024
GeneseeCALIFORNIA42024
LakeshoreCALIFORNIA32024
StrawberryCALIFORNIA32019
DownievilleCALIFORNIA22022
Forest Hill 2CALIFORNIA22005
WestvilleCALIFORNIA12022
JohnsvilleCALIFORNIA11996
WoodfordsCALIFORNIA12021
RivertonCALIFORNIA12013
PaxtonCALIFORNIA12024
Meadow ValleyCALIFORNIA12008
PlacervilleCALIFORNIA12021
Pine MountainCALIFORNIA12005

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