Species · California · BBS 2025 Release · 1966–2024
Ruddy Duck Population Trend in California
Ruddy Duck in California has increased: up 42% on the route-weighted index since 1972.
+42%Since 1972
50Routes In State
54Years
Notable Ruddy Duck Trends in California
No notable trend signals for Ruddy Duck in California. See the full index history below.
Ruddy Duck Population Forecast in California
If the recent trend holds, Ruddy Duck in California is projected to rise about 16% by 2029 — from 0.44 in 2024 to a central estimate of 0.51 (95% range 0.00–1.8). A 5-year backtest shows a typical error of ±154.7%, with 100% of held-out values landing inside the 95% band.
+16%Change by 2029
0.51Projected 2029 index
0.00–1.895% range
±154.7%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.55 | 0.00 | 1.8 |
| 2026 | 0.54 | 0.00 | 1.8 |
| 2027 | 0.53 | 0.00 | 1.8 |
| 2028 | 0.52 | 0.00 | 1.8 |
| 2029 | 0.51 | 0.00 | 1.8 |
Ruddy Duck Survey Routes in California
| Niland | 65 | 2021 | 1973 |
| Likely | 15 | 2024 | 1990 |
| Mark West | 15 | 1978 | 1978 |
| Dorris | 14 | 2019 | 1972 |
| Benton | 10 | 2024 | 1974 |
| Adelaida | 10 | 2015 | 1988 |
| Collegeville | 9 | 1987 | 1987 |
| Anza | 7 | 1975 | 1973 |
| Jofegan 2 | 6 | 2024 | 2024 |
| Haiwee Res | 6 | 1992 | 1992 |
| Lockwood | 6 | 2023 | 1981 |
| Buena Vista | 6 | 2019 | 2019 |
| Madeline | 5 | 2024 | 2016 |
| Foster Park | 5 | 1975 | 1975 |
| Ora Loma | 5 | 1995 | 1973 |
| S Catalina | 5 | 1998 | 1993 |
| Iron Gate | 4 | 2008 | 1989 |
| Jacumba | 4 | 1995 | 1995 |
| Carrizo Pln | 4 | 1978 | 1978 |
| Macdoel | 4 | 1995 | 1974 |
| Big Bear | 4 | 1986 | 1972 |
| Ingalls | 4 | 1994 | 1989 |
| Cp. Pendleton | 4 | 1991 | 1970 |
| Clear Lk Res | 3 | 1999 | 1981 |
| Cedarville | 3 | 2017 | 2003 |
Ruddy Duck Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.