Species · Oregon · BBS 2025 Release · 1966–2024
Western Grebe Population Trend in Oregon
Western Grebe in Oregon has collapsed: down 94% on the route-weighted index since 1988.
-94%Since 1988
17Routes In State
38Years
Notable Western Grebe Trends in Oregon
long arc declinecomputed index
Western Grebe has collapsed in Oregon: down 94% on the route-weighted index since 1988.
Western Grebe Population Forecast in Oregon
If the recent trend holds, Western Grebe in Oregon is projected to fall about 100% by 2029 — from 0.19 in 2024 to a central estimate of 0.00 (95% range 0.00–1.9). A 5-year backtest shows a typical error of ±126.4%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2029
0.00Projected 2029 index
0.00–1.995% range
±126.4%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.04 | 0.00 | 1.9 |
| 2026 | 0.00 | 0.00 | 1.9 |
| 2027 | 0.00 | 0.00 | 1.9 |
| 2028 | 0.00 | 0.00 | 1.9 |
| 2029 | 0.00 | 0.00 | 1.9 |
Western Grebe Survey Routes in Oregon
| Modoc Point | 33 | 2018 | 1986 |
| Sparta | 12 | 2000 | 1994 |
| Harney Lake | 9 | 1995 | 1993 |
| Fish Lake | 6 | 2024 | 2014 |
| Catlow Rim | 5 | 2024 | 2005 |
| Warner Vally | 4 | 2024 | 1994 |
| Blizzard Gap | 4 | 2018 | 1987 |
| Modoc Point 2 | 3 | 2024 | 2024 |
| Alvord Lake | 2 | 2019 | 1986 |
| Bly 2 | 1 | 2013 | 2013 |
| Joseph | 1 | 2017 | 1988 |
| Merrill | 1 | 1994 | 1994 |
| Sheaville | 1 | 2017 | 2014 |
| Umatilla | 1 | 1996 | 1996 |
| Dell Spring | 1 | 1990 | 1990 |
| Wedderburn | 1 | 1986 | 1986 |
| Malheur Nwr | 1 | 1997 | 1986 |
Western Grebe Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.