Species · Idaho · BBS 2025 Release · 1966–2024
Lesser Scaup Population Trend in Idaho
Lesser Scaup in Idaho has increased: up 43% on the route-weighted index since 1973.
+43%Since 1973
21Routes In State
48Years
Notable Lesser Scaup Trends in Idaho
No notable trend signals for Lesser Scaup in Idaho. See the full index history below.
Lesser Scaup Population Forecast in Idaho
If the recent trend holds, Lesser Scaup in Idaho is projected to fall about 20% by 2029 — from 1.7 in 2024 to a central estimate of 1.3 (95% range 0.20–2.5). A 5-year backtest shows a typical error of ±20.6%, with 100% of held-out values landing inside the 95% band.
-20%Change by 2029
1.3Projected 2029 index
0.20–2.595% range
±20.6%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 1.3 | 0.17 | 2.5 |
| 2026 | 1.3 | 0.17 | 2.5 |
| 2027 | 1.3 | 0.18 | 2.5 |
| 2028 | 1.3 | 0.19 | 2.5 |
| 2029 | 1.3 | 0.20 | 2.5 |
Lesser Scaup Survey Routes in Idaho
| Iron Springs | 38 | 2024 | 1988 |
| Mud Lake | 16 | 2023 | 1988 |
| Blackft Res | 15 | 2018 | 1984 |
| Centerville | 4 | 2010 | 1992 |
| Sawtooth City 2 | 4 | 2017 | 2017 |
| Cedar Hill | 4 | 2024 | 2015 |
| Naples | 3 | 1977 | 1977 |
| Blacks Creek | 3 | 1982 | 1973 |
| Kyle Canyon | 2 | 1998 | 1996 |
| Cascade | 2 | 1978 | 1977 |
| Springfield | 2 | 2014 | 1971 |
| Triangle | 2 | 2015 | 2006 |
| Magic Mtn | 2 | 1999 | 1999 |
| Crane Creek | 2 | 1994 | 1994 |
| Picabo | 2 | 2009 | 1989 |
| Bates | 2 | 2006 | 2005 |
| Cabarton | 2 | 2022 | 2022 |
| Pasadena Val | 2 | 2014 | 2003 |
| Henry | 1 | 1978 | 1978 |
| Featherville | 1 | 2013 | 2013 |
| Dougal Res | 1 | 1998 | 1995 |
Lesser Scaup Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.