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

Gadwall Population Trend in Kansas

All statesWaterfowl

Gadwall in Kansas has collapsed: down 95% on the route-weighted index since 1970.

-95%Since 1970
7Routes In State
18Years

Notable Gadwall Trends in Kansas

long arc declinecomputed index

Gadwall has collapsed in Kansas: down 95% on the route-weighted index since 1970.

Gadwall Population Forecast in Kansas

If the recent trend holds, Gadwall in Kansas is projected to stay roughly flat through 2026, near 0.00 (95% range 0.00–0.65). A 5-year backtest shows a typical error of ±3078.4%, with 40% of held-out values landing inside the 95% band.

n/aChange by 2026
0.00Projected 2026 index
0.00–0.6595% range
±3078.4%Backtest error
19682026
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
20220.000.000.65
20230.000.000.65
20240.000.000.65
20250.000.000.65
20260.000.000.65

Gadwall Survey Routes in Kansas

Routes recording Gadwall in Kansas.
St John619691969
Albert419871968
Logan219771977
Wallace220212021
Leoville219771977
Missler120051980
Grigston120072007

Gadwall Population Trend in Other States

alaskaarizonacaliforniacoloradodelawareidahoillinoisiowamassachusettsmichiganminnesotamissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-dakotaoklahomaoregonpennsylvaniarhode-islandsouth-dakotatexasutahvermontwashingtonwisconsinwyoming

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