Species · Utah · BBS 2025 Release · 1966–2024
Willet Population Trend in Utah
Willet in Utah has collapsed: down 87% on the route-weighted index since 1972.
-87%Since 1972
18Routes In State
48Years
Notable Willet Trends in Utah
long arc declinecomputed index
Willet has collapsed in Utah: down 86% on the route-weighted index since 1972.
Willet Population Forecast in Utah
If the recent trend holds, Willet in Utah is projected to fall about 100% by 2029 — from 0.75 in 2024 to a central estimate of 0.00 (95% range 0.00–4.9). A 5-year backtest shows a typical error of ±155.9%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2029
0.00Projected 2029 index
0.00–4.995% range
±155.9%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.00 | 0.00 | 4.9 |
| 2026 | 0.00 | 0.00 | 4.9 |
| 2027 | 0.00 | 0.00 | 4.9 |
| 2028 | 0.00 | 0.00 | 4.9 |
| 2029 | 0.00 | 0.00 | 4.9 |
Willet Survey Routes in Utah
| Snowville | 32 | 2024 | 1999 |
| Neponset Res | 8 | 2018 | 1995 |
| E. Bear Lake | 6 | 2022 | 1997 |
| Randolph | 6 | 2024 | 1992 |
| Timpie Spg | 5 | 2002 | 1978 |
| Promontory | 4 | 2024 | 1971 |
| Saleratus Cr | 4 | 2017 | 1995 |
| Goshen | 3 | 2021 | 1970 |
| Callao | 3 | 2019 | 1992 |
| Woodruff | 2 | 2023 | 2007 |
| Crawford Mts | 2 | 2015 | 2004 |
| Leamington | 1 | 2003 | 1993 |
| Salt Springs | 1 | 2021 | 1986 |
| Gold Hill | 1 | 1987 | 1987 |
| Delta | 1 | 2010 | 1997 |
| Grantsville | 1 | 2024 | 2003 |
| Kamas | 1 | 2024 | 2024 |
| Bear River | 1 | 2023 | 1992 |
Willet Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.