Species · Colorado · BBS 2025 Release · 1966–2024
Long-billed Curlew Population Trend in Colorado
Long-billed Curlew in Colorado has collapsed: down 92% on the route-weighted index since 1973.
-92%Since 1973
33Routes In State
51Years
Notable Long-billed Curlew Trends in Colorado
long arc declinecomputed index
Long-billed Curlew has collapsed in Colorado: down 92% on the route-weighted index since 1973.
Long-billed Curlew Population Forecast in Colorado
If the recent trend holds, Long-billed Curlew in Colorado is projected to fall about 100% by 2029 — from 0.19 in 2024 to a central estimate of 0.00 (95% range 0.00–1.5). A 5-year backtest shows a typical error of ±177.4%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2029
0.00Projected 2029 index
0.00–1.595% range
±177.4%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.00 | 0.00 | 1.5 |
| 2026 | 0.00 | 0.00 | 1.5 |
| 2027 | 0.00 | 0.00 | 1.5 |
| 2028 | 0.00 | 0.00 | 1.5 |
| 2029 | 0.00 | 0.00 | 1.5 |
Long-billed Curlew Survey Routes in Colorado
| Last Chance | 11 | 1981 | 1981 |
| Sheridan Lak | 11 | 1998 | 1998 |
| Villegreen | 8 | 2024 | 1996 |
| Haswell | 5 | 1999 | 1992 |
| Edler | 5 | 2024 | 1992 |
| Wildhorse L | 4 | 1999 | 1999 |
| Campo | 4 | 2019 | 1988 |
| Pinneo | 3 | 1994 | 1973 |
| Two Buttes | 3 | 1994 | 1973 |
| Bethune | 3 | 2011 | 2011 |
| Ninaview | 3 | 2024 | 1995 |
| Fleming | 2 | 1977 | 1977 |
| Rush | 2 | 1984 | 1984 |
| Fruita | 2 | 1989 | 1989 |
| Edison | 2 | 2010 | 1993 |
| Karval | 2 | 1996 | 1996 |
| Pritchett | 2 | 2024 | 1995 |
| Mosca | 2 | 2006 | 1993 |
| Gardner | 2 | 2003 | 2003 |
| Maybell | 1 | 1970 | 1970 |
| Abarr | 1 | 2015 | 1969 |
| Boyero | 1 | 1997 | 1997 |
| Lamar | 1 | 2021 | 1973 |
| Gilpin | 1 | 2002 | 1970 |
| Wilson Creek | 1 | 2011 | 2011 |
Long-billed Curlew Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.