BirdAnalyst
Species · Connecticut · BBS 2026 Release · 1966–2025

Wood Duck Population Trend in Connecticut

All statesWaterfowl

Wood Duck in Connecticut has held roughly steady: up 3% on the route-weighted index since 1969.

+3%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 →
20Routes 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 →
54YearsYears 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 ConnecticutNotable 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 Connecticut. See the full index history below.

Wood Duck Population Forecast in Connecticut

If the recent trend holds, Wood Duck in Connecticut is projected to rise about 11% by 2030 — from 0.75 in 2025 to a central estimate of 0.83 (95% range 0.00–2.0). A 5-year backtest shows a typical error of ±192.7%, with 100% of held-out values landing inside the 95% band.

+11%Change by 2030TrendPercent 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 →
0.83Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–2.095% 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 →
±192.7%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 Connecticut is projected to rise about 11% by 2030 — from 0.75 in 2025 to a central estimate of 0.83 (95% range 0.00–2.0). A 5-year backtest shows a typical error of ±192.7%, with 100% of held-out values landing inside the 95% band.19672030
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 →
20260.810.001.9
20270.820.001.9
20280.820.001.9
20290.830.002.0
20300.830.002.0

Wood Duck Survey Routes in Connecticut

Routes recording Wood Duck in Connecticut.
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 →
Warren1120111972
Mid Haddam620251978
E Hartland319791967
New Hartford320212007
Mystic220191973
Woodstock220071969
Westbrook219911991
No Woodbury220131968
Greenwich220141967
Long Hill220181972
New Hartford219841983
Buckingham120211993
Uncasville120232023
Willimantic120141970
Sherman120191973
Danbury120231969
Southington120222022
Woodstock 2120242018
Warren 2120142013
Granby120212021

Wood Duck Population Trend in Other States

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

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.