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

Mallard Population Trend in Wisconsin

All statesWaterfowl

Mallard in Wisconsin has fallen sharply: down 55% on the route-weighted index since 1968.

-55%Since 1968
98Routes In State
58Years

Notable Mallard Trends in Wisconsin

long arc declinecomputed index

Mallard has fallen sharply in Wisconsin: down 54% on the route-weighted index since 1968.

Mallard Population Forecast in Wisconsin

If the recent trend holds, Mallard in Wisconsin is projected to rise about 43% by 2029 — from 2.7 in 2024 to a central estimate of 3.9 (95% range 0.29–7.4). A 5-year backtest shows a typical error of ±70.1%, with 100% of held-out values landing inside the 95% band.

+43%Change by 2029
3.9Projected 2029 index
0.29–7.495% range
±70.1%Backtest error
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 index95% low95% high
20253.90.387.5
20263.90.357.5
20273.90.337.5
20283.90.317.4
20293.90.297.4

Mallard Survey Routes in Wisconsin

Routes recording Mallard in Wisconsin.
Omro3420011966
Holland3320242001
Kiel1520221999
Pt Washingtn1320241966
Raymond1320241967
Omro 21320242002
Hatfield1219941970
Gilman1120241973
Unity1120241968
Stevens Pt1120211967
Hudson1020241966
Manitowoc1020241966
Holway919891973
Hollister820241970
Stratford820241967
Rolling Grnd820111986
Rolling Pr820241966
Wiota820241975
Buena Vista820241998
Rib Lake720231967
Princeton720191967
Irma620241971
Mount Horeb619901969
Weyerhauser520241967
Manawa520241967

Mallard Population Trend in Other States

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

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