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

Gadwall Population Trend in Oregon

All statesWaterfowl

Gadwall in Oregon has surged: up 473% on the route-weighted index since 1971.

+473%Since 1971
37Routes In State
55Years

Notable Gadwall Trends in Oregon

long arc increasecomputed index

Gadwall has surged in Oregon: up 473% on the route-weighted index since 1971.

Gadwall Population Forecast in Oregon

If the recent trend holds, Gadwall in Oregon is projected to rise about 92% by 2029 — from 1.2 in 2024 to a central estimate of 2.3 (95% range 0.00–7.2). A 5-year backtest shows a typical error of ±291.2%, with 100% of held-out values landing inside the 95% band.

+92%Change by 2029
2.3Projected 2029 index
0.00–7.295% range
±291.2%Backtest error
19692029
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
20252.20.007.1
20262.20.007.1
20272.30.007.2
20282.30.007.2
20292.30.007.2

Gadwall Survey Routes in Oregon

Routes recording Gadwall in Oregon.
Warner Vally4820241993
Fish Lake2520241972
Modoc Point 21220242024
Merrill920221994
Malheur Nwr819961986
Catlow Rim720241993
Bly619951992
Flook Lake620241995
Lapham Res.519941994
Princeton519851972
Zumwalt420001998
Nicolai Mtn.420172002
Bly 2420242007
Blizzard Gap420231984
Trout Creek320171996
Bridgeport320121995
Chinchalo320241993
Three Forks220242004
Blitzen 2220242024
Scappoose220082008
Fandango Can219981998
Modoc Point220181969
Blitzen219831983
Willow Spg219711969
Adair220212004

Gadwall Population Trend in Other States

alaskaarizonacaliforniacoloradodelawareidahoillinoisiowakansasmassachusettsmichiganminnesotamissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-dakotaoklahomapennsylvaniarhode-islandsouth-dakotatexasutahvermontwashingtonwisconsinwyoming

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