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Species · Maine · BBS 2025 Release · 1966–2024

Black-backed Woodpecker Population Trend in Maine

All statesForest birds

Black-backed Woodpecker in Maine has fallen sharply: down 53% on the route-weighted index since 1978.

-53%Since 1978TrendPercent 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 →
21Routes 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 →
32YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Black-backed Woodpecker Trends in MaineNotable 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 →

Black-backed Woodpecker has fallen sharply in Maine: down 53% on the route-weighted index since 1978.

Black-backed Woodpecker Population Forecast in Maine

If the recent trend holds, Black-backed Woodpecker in Maine is projected to stay roughly flat through 2027, near 0.00 (95% range 0.00–0.22). A 5-year backtest shows a typical error of ±89.1%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2027TrendPercent 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 2027 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 →
±89.1%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, Black-backed Woodpecker in Maine is projected to stay roughly flat through 2027, near 0.00 (95% range 0.00–0.22). A 5-year backtest shows a typical error of ±89.1%, with 100% of held-out values landing inside the 95% band.19682027
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 →
20230.000.000.22
20240.000.000.22
20250.000.000.22
20260.000.000.22
20270.000.000.22

Black-backed Woodpecker Survey Routes in Maine

Routes recording Black-backed Woodpecker in Maine.
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 →
Cooper619811978
Northfield319811981
Eastbrook219851985
Moose River219841984
Grnd Lk Strm219901990
Wilson Mills119991984
Nesowadnehun119971990
Otisfield Gr119861986
Heron Lake120011983
Carrying Pl120221999
Charleston119811981
Baxter119841977
Winn119961996
Medway119921979
Clayton Lake119771977
Pillsbury Pd119681968
Horse Mtn120091984
St David120041991
Big Twenty119981995
Weeks Brook120112002
Priestly Br.120002000

Black-backed Woodpecker Population Trend in Other States

alaskacaliforniaidahomichiganminnesotamontananew-hampshirenew-yorkoregonsouth-dakotawashingtonwisconsinwyoming

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