Species · Utah · BBS 2025 Release · 1966–2024
Lesser Scaup Population Trend in Utah
Lesser Scaup in Utah has declined: down 47% on the route-weighted index since 1988.
-47%Since 1988
13Routes In State
37Years
Notable Lesser Scaup Trends in Utah
No notable trend signals for Lesser Scaup in Utah. See the full index history below.
Lesser Scaup Population Forecast in Utah
If the recent trend holds, Lesser Scaup in Utah is projected to rise about 301% by 2029 — from 0.10 in 2024 to a central estimate of 0.41 (95% range 0.00–1.2). A 5-year backtest shows a typical error of ±1516.3%, with 100% of held-out values landing inside the 95% band.
+301%Change by 2029
0.41Projected 2029 index
0.00–1.295% range
±1516.3%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.41 | 0.00 | 1.2 |
| 2026 | 0.41 | 0.00 | 1.2 |
| 2027 | 0.41 | 0.00 | 1.2 |
| 2028 | 0.41 | 0.00 | 1.2 |
| 2029 | 0.41 | 0.00 | 1.2 |
Lesser Scaup Survey Routes in Utah
| Skyline Driv | 6 | 2002 | 1986 |
| M Warner Res | 6 | 2024 | 1993 |
| Neponset Res | 5 | 2017 | 1995 |
| Lynn | 5 | 2021 | 1995 |
| Vernal | 4 | 2016 | 1999 |
| Moon Lake | 3 | 2000 | 1994 |
| Main Canyon | 3 | 2018 | 2016 |
| Saleratus Cr | 2 | 2015 | 1995 |
| Uintah Nf | 2 | 1992 | 1988 |
| Bear River | 2 | 1994 | 1993 |
| Callao | 2 | 2021 | 1999 |
| Grizzly Rdge | 1 | 1998 | 1998 |
| Navajo Lake | 1 | 2022 | 1990 |
Lesser Scaup Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.