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Species · Wisconsin · BBS 2025 Release · 1966–2024

Ring-necked Duck Population Trend in Wisconsin

All statesWaterfowl

Ring-necked Duck in Wisconsin has declined: down 40% on the route-weighted index since 1969.

-40%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 →
17Routes 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 →
33YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Ring-necked 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 →

No notable trend signals for Ring-necked Duck in Wisconsin. See the full index history below.

Ring-necked Duck Population Forecast in Wisconsin

If the recent trend holds, Ring-necked Duck in Wisconsin is projected to fall about 70% by 2029 — from 0.09 in 2024 to a central estimate of 0.03 (95% range 0.00–0.09). A 5-year backtest shows a typical error of ±56.1%, with 80% of held-out values landing inside the 95% band.

-70%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 →
0.03Projected 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 →
0.00–0.0995% 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 →
±56.1%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, Ring-necked Duck in Wisconsin is projected to fall about 70% by 2029 — from 0.09 in 2024 to a central estimate of 0.03 (95% range 0.00–0.09). A 5-year backtest shows a typical error of ±56.1%, 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 →
20250.030.000.09
20260.030.000.09
20270.030.000.09
20280.030.000.09
20290.030.000.09

Ring-necked Duck Survey Routes in Wisconsin

Routes recording Ring-necked 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 →
Cumberland719991966
Gilman620242006
Mather220112010
Elderon219761966
Union Twp220171973
Rib Lake219991982
Amberg220042004
Minong120241977
Grand View120152002
Shanagolden119961982
Hudson120132013
Loraine120111967
Oconto Falls119961996
Conover120221999
Phillips119941994
Crandon120172017
Washington I119941992

Ring-necked Duck Population Trend in Other States

alabamaalaskaarizonacaliforniacoloradoidahoiowamainemichiganminnesotamontananebraskanevadanew-hampshirenew-yorknorth-dakotaohiooregonsouth-dakotautahvermontwashingtonwyoming

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