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

American Wigeon Population Trend in Wyoming

All statesWaterfowl

American Wigeon in Wyoming has increased: up 27% on the route-weighted index since 1971.

+27%Since 1971TrendPercent 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 →
68Routes 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 →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable American Wigeon Trends in WyomingNotable 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 American Wigeon in Wyoming. See the full index history below.

American Wigeon Population Forecast in Wyoming

If the recent trend holds, American Wigeon in Wyoming is projected to stay roughly flat through 2030, near 0.70 (95% range 0.00–1.6). A 5-year backtest shows a typical error of ±145.6%, with 100% of held-out values landing inside the 95% band.

-10%Change by 2030TrendPercent 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 →
0.70Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–1.695% 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 →
±145.6%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, American Wigeon in Wyoming is projected to stay roughly flat through 2030, near 0.70 (95% range 0.00–1.6). A 5-year backtest shows a typical error of ±145.6%, with 100% of held-out values landing inside the 95% band.19692030
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 →
20260.700.001.6
20270.700.001.6
20280.700.001.6
20290.700.001.6
20300.700.001.6

American Wigeon Survey Routes in Wyoming

Routes recording American Wigeon in Wyoming.
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 →
Kaycee3420252025
Hayden Val1319861985
Nowood1220251990
Highlight919911982
Wyarno820191977
Yellowstone820251987
Natrona719921972
Thunder Basin620252025
Bill520001992
Riverview520221990
Seedskadee520161994
Ervay420222011
Brookhurst420091969
Upton420251987
Rawlins420061988
Walcott420251989
Elk Horn320152003
Clark319921992
Daniel319881980
Shirley320241989
Baggs319981997
Sybille Cyn320242013
Ne Entrance220241988
Colter Bay219991995
Seely 2220152001

American Wigeon Population Trend in Other States

alaskacaliforniacoloradoidahokansasmichiganminnesotamontananebraskanevadanew-mexiconorth-dakotaohiooregonpennsylvaniasouth-dakotatexasutahwashingtonwisconsin

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