Species · Idaho · BBS 2025 Release · 1966–2024
Western Grebe Population Trend in Idaho
Western Grebe in Idaho has collapsed: down 91% on the route-weighted index since 1988.
-91%Since 1988
15Routes In State
38Years
Notable Western Grebe Trends in Idaho
long arc declinecomputed index
Western Grebe has collapsed in Idaho: down 91% on the route-weighted index since 1988.
Western Grebe Population Forecast in Idaho
If the recent trend holds, Western Grebe in Idaho is projected to fall about 100% by 2029 — from 0.12 in 2024 to a central estimate of 0.00 (95% range 0.00–3.0). A 5-year backtest shows a typical error of ±338.9%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2029
0.00Projected 2029 index
0.00–3.095% range
±338.9%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.00 | 0.00 | 3.0 |
| 2026 | 0.00 | 0.00 | 3.0 |
| 2027 | 0.00 | 0.00 | 3.0 |
| 2028 | 0.00 | 0.00 | 3.0 |
| 2029 | 0.00 | 0.00 | 3.0 |
Western Grebe Survey Routes in Idaho
| Blacks Creek | 12 | 1996 | 1996 |
| Crane Creek | 4 | 2009 | 1995 |
| Cabarton | 3 | 2023 | 1986 |
| Iron Springs | 3 | 2024 | 1998 |
| Mivoden | 2 | 2022 | 2022 |
| Cedar Hill | 2 | 2016 | 2014 |
| Pasadena Val | 2 | 2014 | 1987 |
| Naples | 1 | 1993 | 1993 |
| Daniels Res | 1 | 2016 | 1988 |
| Preston | 1 | 2023 | 1990 |
| Kyle Canyon | 1 | 1996 | 1996 |
| Sawtooth Cty | 1 | 2014 | 1988 |
| Springfield | 1 | 2015 | 1986 |
| Triangle | 1 | 2008 | 1988 |
| Featherville | 1 | 2022 | 1989 |
Western Grebe Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.