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

American Wigeon Population Trend in Wyoming

All statesWaterfowl

American Wigeon in Wyoming has edged down: down 15% on the route-weighted index since 1971.

-15%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 →
66Routes 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 →
55YearsYears 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 rise about 167% by 2029 — from 0.26 in 2024 to a central estimate of 0.69 (95% range 0.00–1.6). A 5-year backtest shows a typical error of ±191.7%, with 100% of held-out values landing inside the 95% band.

+167%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 →
0.69Projected 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 →
0.00–1.695% 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 →
±191.7%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 rise about 167% by 2029 — from 0.26 in 2024 to a central estimate of 0.69 (95% range 0.00–1.6). A 5-year backtest shows a typical error of ±191.7%, with 100% of held-out values landing inside the 95% band.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 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 →
20250.690.001.6
20260.690.001.6
20270.690.001.6
20280.690.001.6
20290.690.001.6

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 →
Hayden Val1319861985
Highlight919911982
Wyarno820191977
Natrona719921972
Yellowstone620221987
Bill520001992
Riverview520221990
Seedskadee520161994
Ervay420222011
Brookhurst420091969
Upton420241987
Rawlins420061988
Nowood320241990
Elk Horn320152003
Clark319921992
Daniel319881980
Shirley320241989
Baggs319981997
Sybille Cyn320242013
Ne Entrance220161988
Colter Bay219991995
Rozet220232017
Seely 2220152001
Gvnt Valley220112011
Buford219981995

American Wigeon Population Trend in Other States

alaskacaliforniacoloradoidahokansasmichiganminnesotamontananebraskanevadanew-mexiconorth-dakotaohiooregonpennsylvaniasouth-dakotatexasutahwashingtonwisconsin

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