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Species · Wyoming · BBS 2025 Release · 1966–2024

Lewis's Woodpecker Population Trend in Wyoming

All statesForest birds

Lewis's Woodpecker in Wyoming has collapsed: down 75% on the route-weighted index since 1989.

-75%Since 1989TrendPercent 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 →
8Routes 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 →
22YearsYears 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 WyomingNotable 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 Wyoming: down 75% on the route-weighted index since 1989.

Lewis's Woodpecker Population Forecast in Wyoming

If the recent trend holds, Lewis's Woodpecker in Wyoming is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.11). A 5-year backtest shows a typical error of ±161.2%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.01Projected 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 →
0.00–0.1195% 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 →
±161.2%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, Lewis's Woodpecker in Wyoming is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.11). A 5-year backtest shows a typical error of ±161.2%, with 100% of held-out values landing inside the 95% band.19852029
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 →
20250.020.000.11
20260.020.000.11
20270.010.000.11
20280.010.000.11
20290.010.000.11

Lewis's Woodpecker Survey Routes in Wyoming

Routes recording Lewis's Woodpecker in Wyoming.
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 →
Gvnt Valley320051993
Hunter Peak119861986
Crazy Woman120112011
Seely119941994
Ervay119891989
Warbonnet120012001
Fletcher Pk120241985
Mtn View119901990

Lewis's Woodpecker Population Trend in Other States

arizonacaliforniacoloradoidahomontananebraskanevadanew-mexicooregonsouth-dakotautahwashington

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