Species · Utah · BBS 2025 Release · 1966–2024
Western Grebe Population Trend in Utah
Western Grebe in Utah has surged: up 230% on the route-weighted index since 1992.
+230%Since 1992
23Routes In State
34Years
Notable Western Grebe Trends in Utah
long arc increasecomputed index
Western Grebe has surged in Utah: up 230% on the route-weighted index since 1992.
Western Grebe Population Forecast in Utah
If the recent trend holds, Western Grebe in Utah is projected to rise about 264% by 2029 — from 0.25 in 2024 to a central estimate of 0.92 (95% range 0.00–2.0). A 5-year backtest shows a typical error of ±200.9%, with 100% of held-out values landing inside the 95% band.
+264%Change by 2029
0.92Projected 2029 index
0.00–2.095% range
±200.9%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.88 | 0.00 | 2.0 |
| 2026 | 0.89 | 0.00 | 2.0 |
| 2027 | 0.90 | 0.00 | 2.0 |
| 2028 | 0.91 | 0.00 | 2.0 |
| 2029 | 0.92 | 0.00 | 2.0 |
Western Grebe Survey Routes in Utah
| Bear River | 22 | 2023 | 1992 |
| Promontory | 11 | 1998 | 1986 |
| M Warner Res | 10 | 2024 | 1993 |
| Beck | 5 | 1987 | 1986 |
| Kamas | 5 | 2024 | 2000 |
| Neponset Res | 3 | 2018 | 1995 |
| Leamington | 3 | 2014 | 1997 |
| E. Bear Lake | 2 | 2006 | 2006 |
| Randolph | 2 | 2005 | 2002 |
| Ferron | 2 | 2022 | 2006 |
| Monticello | 2 | 2005 | 2005 |
| Saleratus Cr | 1 | 2013 | 1995 |
| Oak City | 1 | 1986 | 1986 |
| Goshen | 1 | 2012 | 2000 |
| Navajo Lake | 1 | 2011 | 2008 |
| Lynn | 1 | 2023 | 1997 |
| Wellington 2 | 1 | 2006 | 2003 |
| Callao | 1 | 2014 | 2004 |
| Dixie Nf | 1 | 2010 | 1994 |
| Vernal | 1 | 2010 | 1999 |
| Newcastle | 1 | 2009 | 2009 |
| Moab | 1 | 1996 | 1996 |
| Jensen | 1 | 2002 | 2002 |
Western Grebe Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.