BirdAnalyst
Species · Colorado · BBS 2025 Release · 1966–2024

Lewis's Woodpecker Population Trend in Colorado

All statesForest birds

Lewis's Woodpecker in Colorado has declined: down 46% on the route-weighted index since 1971.

-46%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 →
42Routes 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 →
50YearsYears 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 ColoradoNotable 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 Lewis's Woodpecker in Colorado. See the full index history below.

Lewis's Woodpecker Population Forecast in Colorado

If the recent trend holds, Lewis's Woodpecker in Colorado is projected to fall about 55% by 2029 — from 0.20 in 2024 to a central estimate of 0.09 (95% range 0.00–0.22). A 5-year backtest shows a typical error of ±24.5%, with 100% of held-out values landing inside the 95% band.

-55%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 →
0.09Projected 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 →
0.00–0.2295% 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 →
±24.5%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 Colorado is projected to fall about 55% by 2029 — from 0.20 in 2024 to a central estimate of 0.09 (95% range 0.00–0.22). A 5-year backtest shows a typical error of ±24.5%, 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 →
20250.100.000.23
20260.090.000.23
20270.090.000.23
20280.090.000.23
20290.090.000.22

Lewis's Woodpecker Survey Routes in Colorado

Routes recording Lewis's Woodpecker in Colorado.
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 →
Piedra620241992
Colona 2620212015
Dolores419841968
Blackhead Pk420191992
Aspen320231980
Uncompahgre320242004
Ninaview320242000
Gardner320241999
Colona220141993
Parlin220051984
Castleton220212021
Gribbles Prk220092009
Mcphee Res.220241996
Paonia220182016
Doyle Bridge219941993
Cokedale219981998
Harmony119951973
Mesaverde Np120051997
Buford119971997
Cheesman Lk120092009
Rosevale120132013
Moffat119781978
Falfa120101974
Pagosa Spgs119821969
Mica Butte119821971

Lewis's Woodpecker Population Trend in Other States

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