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

Lesser Scaup Population Trend in Wyoming

All statesWaterfowl

Lesser Scaup in Wyoming has surged: up 121% on the route-weighted index since 1977.

+121%Since 1977
38Routes In State
47Years

Notable Lesser Scaup Trends in Wyoming

long arc increasecomputed index

Lesser Scaup has surged in Wyoming: up 121% on the route-weighted index since 1977.

Lesser Scaup Population Forecast in Wyoming

If the recent trend holds, Lesser Scaup in Wyoming is projected to rise about 354% by 2029 — from 0.23 in 2024 to a central estimate of 1.0 (95% range 0.00–2.6). A 5-year backtest shows a typical error of ±405.6%, with 100% of held-out values landing inside the 95% band.

+354%Change by 2029
1.0Projected 2029 index
0.00–2.695% range
±405.6%Backtest error
19682029
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
20251.00.002.6
20261.00.002.6
20271.00.002.6
20281.00.002.6
20291.00.002.6

Lesser Scaup Survey Routes in Wyoming

Routes recording Lesser Scaup in Wyoming.
Hayden Val2919861985
Mammoth1320241982
Clark1220012000
Yellowstone1120221987
Rock River820221990
Bucknum520011993
Hunter Peak420241996
Seedskadee419971997
Warbonnet420172002
Fontenelle319871987
Ervay320182018
Crazy Woman320101998
Fiddler Lk320111982
Dubois220112011
Brookhurst219921968
Cumberland219991977
Moose220191977
Boulder220222016
Pathfinder220011995
Harmony220212014
Welch219911991
Ne Entrance120211982
Cody119981998
Colter Bay119701970
Nowood120241993

Lesser Scaup Population Trend in Other States

alaskacaliforniacoloradoidahoiowakansasmichiganminnesotamontananebraskanevadanew-mexiconorth-dakotaoregonsouth-dakotautahwashingtonwisconsin

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