BirdAnalyst
Species · BCR 5 · BBS 2026 Release · 1966–2025

Acorn Woodpecker In Northern Pacific Rainforest

All regionsNorthern Pacific RainforestForest birds

Acorn Woodpecker in Northern Pacific Rainforest has edged down: down 13% on the route-weighted index since 1970.

-13%Since 1970TrendPercent 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 →
47Routes 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 →
57YearsYears 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 →

No notable trend signals for Acorn Woodpecker in Northern Pacific Rainforest. See the full index history below.

Acorn Woodpecker In Northern Pacific Rainforest Population Forecast

If the recent trend holds, Acorn Woodpecker in Northern Pacific Rainforest is projected to fall about 51% by 2030 — from 2.4 in 2025 to a central estimate of 1.2 (95% range 0.00–2.9). A 5-year backtest shows a typical error of ±42.2%, with 100% of held-out values landing inside the 95% band.

-51%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 →
1.2Projected 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 →
0.00–2.995% 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 →
±42.2%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, Acorn Woodpecker in Northern Pacific Rainforest is projected to fall about 51% by 2030 — from 2.4 in 2025 to a central estimate of 1.2 (95% range 0.00–2.9). A 5-year backtest shows a typical error of ±42.2%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20261.30.003.0
20271.30.003.0
20281.20.003.0
20291.20.002.9
20301.20.002.9

Routes In Northern Pacific Rainforest

Routes recording Acorn Woodpecker in Northern Pacific Rainforest.
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 →
Shasta LakeCALIFORNIA352025
AlderpointCALIFORNIA302012
LongvaleCALIFORNIA222023
UkiahCALIFORNIA222011
Sams ValleyOREGON222025
Emigrant Lake 2OREGON182025
Hay ForkCALIFORNIA162017
UmpquaOREGON162025
Emigrant LkOREGON152001
Fish RockCALIFORNIA142014
Burnt RanchCALIFORNIA132016
DerbyOREGON121993
GazelleCALIFORNIA112021
SelmaOREGON112025
South Fork MtnCALIFORNIA102022
Secret ValOREGON92025
GreenOREGON92025
RuchOREGON92025
HullvilleCALIFORNIA82019
Junction CtyCALIFORNIA82012
French GulchCALIFORNIA82011
MccloudCALIFORNIA72021
Friday RidgeCALIFORNIA62025
AdairOREGON62025
CanbyOREGON62025

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