Species · California · BBS 2025 Release · 1966–2024
American Wigeon Population Trend in California
American Wigeon in California has fallen sharply: down 75% on the route-weighted index since 1973.
-75%Since 1973
19Routes In State
44Years
Notable American Wigeon Trends in California
long arc declinecomputed index
American Wigeon has fallen sharply in California: down 75% on the route-weighted index since 1973.
American Wigeon Population Forecast in California
If the recent trend holds, American Wigeon in California is projected to stay roughly flat through 2026, near 0.02 (95% range 0.00–0.11). A 5-year backtest shows a typical error of ±81.2%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2026
0.02Projected 2026 index
0.00–0.1195% range
±81.2%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2022 | 0.03 | 0.00 | 0.12 |
| 2023 | 0.03 | 0.00 | 0.11 |
| 2024 | 0.02 | 0.00 | 0.11 |
| 2025 | 0.02 | 0.00 | 0.11 |
| 2026 | 0.02 | 0.00 | 0.11 |
American Wigeon Survey Routes in California
| Clear Lk Res | 7 | 2001 | 1983 |
| Iron Gate | 4 | 1994 | 1994 |
| Madeline | 4 | 2011 | 2011 |
| Riovista | 3 | 1976 | 1976 |
| Crowder Flat | 3 | 2018 | 2016 |
| Dorris | 3 | 2017 | 1975 |
| Nubieber | 2 | 2003 | 2003 |
| Hughson | 2 | 2010 | 1971 |
| Likely | 2 | 2014 | 1976 |
| Goumaz | 2 | 2011 | 2011 |
| Macdoel | 2 | 1993 | 1993 |
| Ingalls | 2 | 2001 | 1973 |
| Crowley Lake | 1 | 2021 | 1980 |
| Sattley | 1 | 1972 | 1972 |
| Davis Creek | 1 | 1993 | 1993 |
| Lockwood | 1 | 1996 | 1996 |
| Cedarville | 1 | 1975 | 1975 |
| Ravendale | 1 | 1983 | 1973 |
| Benton | 1 | 2015 | 2015 |
American Wigeon Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.