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

Wood Duck Population Trend in Wisconsin

All statesWaterfowl

Wood Duck in Wisconsin has surged: up 190% on the route-weighted index since 1968.

+190%Since 1968TrendPercent 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 →
95Routes 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 →
58YearsYears 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 WisconsinNotable 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 increasecomputed 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 →

Wood Duck has surged in Wisconsin: up 190% on the route-weighted index since 1968.

Wood Duck Population Forecast in Wisconsin

If the recent trend holds, Wood Duck in Wisconsin is projected to rise about 75% by 2029 — from 0.60 in 2024 to a central estimate of 1.1 (95% range 0.38–1.7). A 5-year backtest shows a typical error of ±73.7%, with 80% of held-out values landing inside the 95% band.

+75%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 →
1.1Projected 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 →
0.38–1.795% 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 →
±73.7%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 Wisconsin is projected to rise about 75% by 2029 — from 0.60 in 2024 to a central estimate of 1.1 (95% range 0.38–1.7). A 5-year backtest shows a typical error of ±73.7%, with 80% 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 →
20251.00.351.7
20261.00.361.7
20271.00.371.7
20281.00.371.7
20291.10.381.7

Wood Duck Survey Routes in Wisconsin

Routes recording Wood Duck in Wisconsin.
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 →
Omro2919991969
Kiel1220221998
Hudson820241968
Fall River720241987
Wiota620241986
Grand View520241968
Cochrane420241968
Casco420181970
N Freedom420211968
Holland420122008
Loraine320211967
Weyerhauser320241975
Hollister320111979
Trempealeau320241967
Iron River220231987
Land O Lakes220081976
Cumberland220221967
Exeland220211969
Holway219831969
Phillips220221977
Rib Lake220231970
Crandon219971967
Esdaile220121966
Cadott220121974
Wis Rapids220211975

Wood Duck Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawyoming

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