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Species · Idaho · BBS 2025 Release · 1966–2024

Lewis's Woodpecker Population Trend in Idaho

All statesForest birds

Lewis's Woodpecker in Idaho has surged: up 79% on the route-weighted index since 1976.

+79%Since 1976TrendPercent 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 →
16Routes 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 →
44YearsYears 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 IdahoNotable 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 increasecomputed 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 surged in Idaho: up 79% on the route-weighted index since 1976.

Lewis's Woodpecker Population Forecast in Idaho

If the recent trend holds, Lewis's Woodpecker in Idaho is projected to fall about 44% by 2029 — from 0.28 in 2024 to a central estimate of 0.16 (95% range 0.00–0.31). A 5-year backtest shows a typical error of ±60.5%, with 40% of held-out values landing inside the 95% band.

-44%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 →
0.16Projected 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 →
0.00–0.3195% 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 →
±60.5%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 Idaho is projected to fall about 44% by 2029 — from 0.28 in 2024 to a central estimate of 0.16 (95% range 0.00–0.31). A 5-year backtest shows a typical error of ±60.5%, with 40% of held-out values landing inside the 95% band.19712029
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 →
20250.150.000.30
20260.150.000.31
20270.150.000.31
20280.150.000.31
20290.160.000.31

Lewis's Woodpecker Survey Routes in Idaho

Routes recording Lewis's Woodpecker in Idaho.
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 →
Nezperce619921985
Silver City620241993
Cascade419831983
Salmon River420211988
Featherville220231993
Naples119751975
Mivoden119891989
Almo120092009
Gifford119711971
Baker120221982
Challis120191976
Squirrel119941986
Iron Springs120221991
Triangle120212010
Magic Mtn120241987
Coolin119871987

Lewis's Woodpecker Population Trend in Other States

arizonacaliforniacoloradomontananebraskanevadanew-mexicooregonsouth-dakotautahwashingtonwyoming

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