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Species · Oregon · BBS 2025 Release · 1966–2024

Lewis's Woodpecker Population Trend in Oregon

All statesForest birds

Lewis's Woodpecker in Oregon has collapsed: down 77% on the route-weighted index since 1971.

-77%Since 1971TrendPercent 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 →
34Routes 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 →
53YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Lewis's Woodpecker Trends in OregonNotable 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 declinecomputed 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 →

Lewis's Woodpecker has collapsed in Oregon: down 77% on the route-weighted index since 1971.

Lewis's Woodpecker Population Forecast in Oregon

If the recent trend holds, Lewis's Woodpecker in Oregon is projected to fall about 100% by 2029 — from 0.17 in 2024 to a central estimate of 0.00 (95% range 0.00–0.50). A 5-year backtest shows a typical error of ±169.4%, with 100% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–0.5095% 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 →
±169.4%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, Lewis's Woodpecker in Oregon is projected to fall about 100% by 2029 — from 0.17 in 2024 to a central estimate of 0.00 (95% range 0.00–0.50). A 5-year backtest shows a typical error of ±169.4%, with 100% of held-out values landing inside the 95% band.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 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 →
20250.000.000.50
20260.000.000.50
20270.000.000.50
20280.000.000.50
20290.000.000.50

Lewis's Woodpecker Survey Routes in Oregon

Routes recording Lewis's Woodpecker in Oregon.
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 →
Dayton619761976
Wizard Falls520172006
Sisters520222021
Buchanan420242021
Mount Vernon420192008
Troy420241998
Bly 2320242024
Garfield319761976
Hells Canyon320222007
Albee220231971
Imnaha220221968
Summit Pr220231986
Bridgeport220221986
Davis Lake220222021
Zumwalt120051998
Lapham Res.119971997
Logdell120241972
Wickiup120032001
Umpqua119701970
Wagontire119701970
Derby119901990
Modoc Point119951973
Scio119711971
Mt Hood119741974
Eightmile119881988

Lewis's Woodpecker Population Trend in Other States

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