Species · Colorado · BBS 2025 Release · 1966–2024
Wilson's Phalarope Population Trend in Colorado
Wilson's Phalarope in Colorado has fallen sharply: down 74% on the route-weighted index since 1973.
-74%Since 1973
43Routes In State
49Years
Notable Wilson's Phalarope Trends in Colorado
long arc declinecomputed index
Wilson's Phalarope has fallen sharply in Colorado: down 74% on the route-weighted index since 1973.
Wilson's Phalarope Population Forecast in Colorado
If the recent trend holds, Wilson's Phalarope in Colorado is projected to rise about 178% by 2028 — from 0.08 in 2023 to a central estimate of 0.23 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±543%, with 100% of held-out values landing inside the 95% band.
+178%Change by 2028
0.23Projected 2028 index
0.00–1.195% range
±543%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2024 | 0.25 | 0.00 | 1.1 |
| 2025 | 0.24 | 0.00 | 1.1 |
| 2026 | 0.24 | 0.00 | 1.1 |
| 2027 | 0.23 | 0.00 | 1.1 |
| 2028 | 0.23 | 0.00 | 1.1 |
Wilson's Phalarope Survey Routes in Colorado
| Nunn | 29 | 2014 | 2010 |
| Briggsdale | 10 | 1996 | 1989 |
| Julesburg | 8 | 2021 | 2004 |
| Pritchett | 7 | 2002 | 2002 |
| Alamosa | 6 | 2023 | 1988 |
| Parlin | 4 | 1989 | 1968 |
| Karval | 4 | 2017 | 2001 |
| Amherst | 4 | 1995 | 1995 |
| Stillwater Pass | 4 | 2003 | 2001 |
| Buford | 3 | 2009 | 1985 |
| Kiowa | 3 | 2000 | 2000 |
| Doyleville | 3 | 2005 | 1988 |
| Edler | 3 | 2014 | 2014 |
| Lamar | 2 | 2023 | 2021 |
| Rio Grnds Rs | 2 | 1992 | 1992 |
| Lay | 2 | 2019 | 1996 |
| Bennett | 2 | 2001 | 2001 |
| Powderhorn | 2 | 1995 | 1995 |
| Stoneham | 2 | 2021 | 1998 |
| Cortez | 2 | 1997 | 1988 |
| Maybell | 1 | 2018 | 1974 |
| Fleming | 1 | 2015 | 1987 |
| Last Chance | 1 | 1983 | 1983 |
| Colona | 1 | 1988 | 1988 |
| Moffat | 1 | 2021 | 1970 |
Wilson's Phalarope Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.