Species · Utah · BBS 2025 Release · 1966–2024
Clark's Grebe Population Trend in Utah
Clark's Grebe in Utah has surged: up 818% on the route-weighted index since 1992.
+818%Since 1992
9Routes In State
30Years
Notable Clark's Grebe Trends in Utah
long arc increasecomputed index
Clark's Grebe has surged in Utah: up 818% on the route-weighted index since 1992.
Clark's Grebe Population Forecast in Utah
If the recent trend holds, Clark's Grebe in Utah is projected to rise about 535% by 2029 — from 0.07 in 2024 to a central estimate of 0.43 (95% range 0.00–1.0). A 5-year backtest shows a typical error of ±474.9%, with 100% of held-out values landing inside the 95% band.
+535%Change by 2029
0.43Projected 2029 index
0.00–1.095% range
±474.9%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.41 | 0.00 | 1.0 |
| 2026 | 0.41 | 0.00 | 1.0 |
| 2027 | 0.42 | 0.00 | 1.0 |
| 2028 | 0.43 | 0.00 | 1.0 |
| 2029 | 0.43 | 0.00 | 1.0 |
Clark's Grebe Survey Routes in Utah
| Bear River | 19 | 2023 | 1992 |
| Ferron | 5 | 2016 | 2007 |
| Kamas | 4 | 2024 | 2019 |
| Neponset Res | 2 | 2016 | 1997 |
| Goshen | 2 | 2012 | 1998 |
| Saleratus Cr | 1 | 2011 | 2011 |
| E. Bear Lake | 1 | 2001 | 1999 |
| Lynn | 1 | 2021 | 1986 |
| Callao | 1 | 2013 | 2011 |
Clark's Grebe Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.