BirdAnalyst
Species · Alaska · BBS 2026 Release · 1966–2025

Gadwall Population Trend in Alaska

All statesWaterfowl

Gadwall in Alaska has collapsed: down 90% on the route-weighted index since 1989.

-90%Since 1989TrendPercent 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 →
8Routes 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 →
14YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Gadwall Trends in AlaskaNotable 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 declinecomputed 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 →

Gadwall has collapsed in Alaska: down 89% on the route-weighted index since 1989.

Gadwall Survey Routes in Alaska

Routes recording Gadwall in Alaska.
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 →
Kachemak619861986
Cold Bay (Short)419921989
Chiniak220181985
Lake Louise219971997
Moose Pass219851985
Unalakleet River220051997
Cold Bay120252003
Copper River119931993

Gadwall Population Trend in Other States

arizonacaliforniacoloradodelawareidahoillinoisindianaiowakansasmassachusettsmichiganminnesotamissourimontananebraskanevadanew-jerseynew-mexiconew-yorknorth-dakotaoklahomaoregonpennsylvaniarhode-islandsouth-dakotatexasutahvermontwashingtonwisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.