BirdAnalyst
Species · BCR 9 · BBS 2025 Release · 1966–2024

Lewis's Woodpecker In Great Basin

All regionsGreat BasinForest birds

Lewis's Woodpecker in Great Basin has fallen sharply: down 72% on the route-weighted index since 1970.

-72%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 →
58Routes 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 →
56YearsYears 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 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 fallen sharply in Great Basin: down 72% on the route-weighted index since 1970.

Lewis's Woodpecker In Great Basin Population Forecast

If the recent trend holds, Lewis's Woodpecker in Great Basin is projected to fall about 46% by 2029 — from 0.21 in 2024 to a central estimate of 0.12 (95% range 0.00–0.39). A 5-year backtest shows a typical error of ±46.7%, with 100% of held-out values landing inside the 95% band.

-46%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 →
0.12Projected 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 →
0.00–0.3995% 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 →
±46.7%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 Great Basin is projected to fall about 46% by 2029 — from 0.21 in 2024 to a central estimate of 0.12 (95% range 0.00–0.39). A 5-year backtest shows a typical error of ±46.7%, 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 →
20250.130.000.41
20260.130.000.41
20270.120.000.40
20280.120.000.40
20290.120.000.39

Routes In Great Basin

Routes recording Lewis's Woodpecker in Great Basin.
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 →
TwispWASHINGTON122024
Iron GateCALIFORNIA62019
Silver CityIDAHO62024
Wizard FallsOREGON52017
SistersOREGON52022
BuchananOREGON42024
Bly 2OREGON32024
SnowdenWASHINGTON31989
NubieberCALIFORNIA22000
BartleCALIFORNIA22004
Fall River MillsCALIFORNIA22011
RanchograndeNEVADA21990
ImnahaOREGON22022
Davis LakeOREGON22022
ReardanWASHINGTON22010
WapatoWASHINGTON21993
Lake ChelanWASHINGTON22018
LikelyCALIFORNIA11984
Crowley LakeCALIFORNIA12023
MacdoelCALIFORNIA12010
Clear Lk ResCALIFORNIA12018
TionestaCALIFORNIA12018
GiffordIDAHO11971
BakerIDAHO12022
SquirrelIDAHO11994

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