Species · California · BBS 2025 Release · 1966–2024
Clark's Grebe Population Trend in California
Clark's Grebe in California has declined: down 34% on the route-weighted index since 1988.
-34%Since 1988
23Routes In State
38Years
Notable Clark's Grebe Trends in California
No notable trend signals for Clark's Grebe in California. See the full index history below.
Clark's Grebe Population Forecast in California
If the recent trend holds, Clark's Grebe in California is projected to rise about 186% by 2029 — from 0.11 in 2024 to a central estimate of 0.31 (95% range 0.00–0.90). A 5-year backtest shows a typical error of ±506.3%, with 100% of held-out values landing inside the 95% band.
+186%Change by 2029
0.31Projected 2029 index
0.00–0.9095% range
±506.3%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.30 | 0.00 | 0.89 |
| 2026 | 0.30 | 0.00 | 0.89 |
| 2027 | 0.31 | 0.00 | 0.90 |
| 2028 | 0.31 | 0.00 | 0.90 |
| 2029 | 0.31 | 0.00 | 0.90 |
Clark's Grebe Survey Routes in California
| Iron Gate | 11 | 2019 | 1988 |
| Dorris | 11 | 2019 | 1986 |
| Buena Vista | 6 | 2019 | 2019 |
| Coyote | 4 | 2024 | 2001 |
| Lake Berryessa | 4 | 2024 | 2023 |
| Nubieber | 3 | 1999 | 1991 |
| Madeline | 3 | 2019 | 2019 |
| San Ysidro | 3 | 1991 | 1986 |
| Hughson | 2 | 2024 | 1988 |
| Moraga | 2 | 2010 | 2004 |
| Bartlett Sps | 2 | 2015 | 2003 |
| Ingalls | 2 | 1999 | 1986 |
| Eagle Lake | 1 | 2021 | 2002 |
| Likely | 1 | 2014 | 2014 |
| Crowder Flat | 1 | 2011 | 2011 |
| Haiwee Res | 1 | 1993 | 1993 |
| Foster Park | 1 | 1993 | 1993 |
| Clear Lk Res | 1 | 2017 | 1987 |
| Hollister | 1 | 2001 | 1999 |
| Copperopolis | 1 | 2021 | 1991 |
| Ora Loma | 1 | 2023 | 2023 |
| Staten Is. | 1 | 2010 | 2008 |
| Folsom | 1 | 1987 | 1987 |
Clark's Grebe Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.