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

Wood Duck Population Trend in Maine

All statesWaterfowl

Wood Duck in Maine has held roughly steady: up 7% on the route-weighted index since 1976.

+7%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 →
39Routes 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 →
42YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Wood Duck 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 →

No notable trend signals for Wood Duck in Maine. See the full index history below.

Wood Duck Population Forecast in Maine

If the recent trend holds, Wood Duck in Maine is projected to stay roughly flat through 2028, near 0.06 (95% range 0.00–0.26). A 5-year backtest shows a typical error of ±46.7%, with 100% of held-out values landing inside the 95% band.

-6%Change by 2028TrendPercent 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 →
0.06Projected 2028 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.2695% 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, Wood Duck in Maine is projected to stay roughly flat through 2028, near 0.06 (95% range 0.00–0.26). A 5-year backtest shows a typical error of ±46.7%, with 100% of held-out values landing inside the 95% band.19722028
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 →
20240.070.000.27
20250.060.000.27
20260.060.000.26
20270.060.000.26
20280.060.000.26

Wood Duck Survey Routes in Maine

Routes recording Wood Duck 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 →
Manchester1019811981
Biddeford719931985
Wilson Mills719941994
Brooks520132013
Harmony420191987
Warren319881988
Hancock320101980
Newcastle220081977
Hartford219791979
Lake Moxie220062006
Ashland220042004
Kittery Pt120061984
Bethel120022002
Turner119911972
Greenwood120191972
South Arm119971975
Otisfield Gr119831983
Bowdoin Ctr120101979
East Troy120172016
Hermon120162013
Aurora120102010
Cooper120061991
Moose River120001985
Carrying Pl120062003
Carrabassett120061988

Wood Duck Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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