BirdAnalyst
Species · New Hampshire · BBS 2025 Release · 1966–2024

Wood Duck Population Trend in New Hampshire

All statesWaterfowl

Wood Duck in New Hampshire has increased: up 49% on the route-weighted index since 1969.

+49%Since 1969TrendPercent 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 →
24Routes 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 →
51YearsYears 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 New HampshireNotable 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 New Hampshire. See the full index history below.

Wood Duck Population Forecast in New Hampshire

If the recent trend holds, Wood Duck in New Hampshire is projected to rise about 21% by 2029 — from 0.32 in 2024 to a central estimate of 0.38 (95% range 0.00–0.78). A 5-year backtest shows a typical error of ±60.5%, with 100% of held-out values landing inside the 95% band.

+21%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 →
0.38Projected 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 →
0.00–0.7895% 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, Wood Duck in New Hampshire is projected to rise about 21% by 2029 — from 0.32 in 2024 to a central estimate of 0.38 (95% range 0.00–0.78). A 5-year backtest shows a typical error of ±60.5%, with 100% of held-out values landing inside the 95% band.19662029
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 →
20250.370.000.77
20260.370.000.77
20270.380.000.77
20280.380.000.78
20290.380.000.78

Wood Duck Survey Routes in New Hampshire

Routes recording Wood Duck in New Hampshire.
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 →
Dover420081996
Strafford220181966
Wilmot220241977
Dixvil Notch219991971
Peterborough120211977
Brentwood119961977
Fitzwilliam120231969
Hopkinton119811977
Epsom120181973
Concord120241978
Canterbury120241968
Gilmantn I W120061994
Mt Chocorua120241974
Walpole120211969
Marlow120231969
Lempster120191988
Jefferson Hl120241990
Franconia120241981
Milan120211979
Stratford120221971
Clarksville120212004
Glen120181999
East Kingston120172003
Jeffers Ntch120152015

Wood Duck Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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