Species · South Dakota · BBS 2025 Release · 1966–2024
Lesser Scaup Population Trend in South Dakota
Lesser Scaup in South Dakota has edged down: down 21% on the route-weighted index since 1969.
-21%Since 1969
23Routes In State
44Years
Notable Lesser Scaup Trends in South Dakota
No notable trend signals for Lesser Scaup in South Dakota. See the full index history below.
Lesser Scaup Population Forecast in South Dakota
If the recent trend holds, Lesser Scaup in South Dakota is projected to fall about 28% by 2024 — from 0.46 in 2019 to a central estimate of 0.33 (95% range 0.00–1.2). A 5-year backtest shows a typical error of ±357.5%, with 100% of held-out values landing inside the 95% band.
-28%Change by 2024
0.33Projected 2024 index
0.00–1.295% range
±357.5%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2020 | 0.34 | 0.00 | 1.2 |
| 2021 | 0.34 | 0.00 | 1.2 |
| 2022 | 0.34 | 0.00 | 1.2 |
| 2023 | 0.33 | 0.00 | 1.2 |
| 2024 | 0.33 | 0.00 | 1.2 |
Lesser Scaup Survey Routes in South Dakota
| White River | 10 | 1997 | 1997 |
| Long Lake | 9 | 2019 | 1967 |
| Forbes | 6 | 2015 | 1979 |
| Gettysburg | 6 | 2000 | 2000 |
| Owanka | 6 | 1993 | 1993 |
| Harding | 4 | 1997 | 1968 |
| Lennox | 3 | 1974 | 1974 |
| Volga | 2 | 2019 | 1967 |
| Wilmot | 2 | 2010 | 2010 |
| Veblen | 2 | 1979 | 1979 |
| Britton | 2 | 2011 | 1978 |
| Ottumwa | 2 | 1997 | 1987 |
| Reva | 2 | 2019 | 1995 |
| Howard | 1 | 2004 | 2004 |
| White Lake | 1 | 2010 | 2010 |
| Cottonwood | 1 | 1997 | 1995 |
| Winner | 1 | 2019 | 2019 |
| Crow Creek | 1 | 2005 | 2005 |
| Conde | 1 | 1969 | 1967 |
| Cedar Pass | 1 | 1991 | 1991 |
| Fort Pierre | 1 | 2015 | 1971 |
| Lodgepole | 1 | 2019 | 2019 |
| Ardmore | 1 | 1996 | 1978 |
Lesser Scaup Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.