Species · Colorado · BBS 2025 Release · 1966–2024
White-faced Ibis Population Trend in Colorado
White-faced Ibis in Colorado has collapsed: down 94% on the route-weighted index since 1991.
-94%Since 1991
26Routes In State
34Years
Notable White-faced Ibis Trends in Colorado
long arc declinecomputed index
White-faced Ibis has collapsed in Colorado: down 94% on the route-weighted index since 1991.
White-faced Ibis Population Forecast in Colorado
If the recent trend holds, White-faced Ibis in Colorado is projected to stay roughly flat through 2029, near 0.03 (95% range 0.00–1.1). A 5-year backtest shows a typical error of ±249.1%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2029
0.03Projected 2029 index
0.00–1.195% range
±249.1%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.12 | 0.00 | 1.2 |
| 2026 | 0.10 | 0.00 | 1.2 |
| 2027 | 0.07 | 0.00 | 1.2 |
| 2028 | 0.05 | 0.00 | 1.1 |
| 2029 | 0.03 | 0.00 | 1.1 |
White-faced Ibis Survey Routes in Colorado
| Fruita | 41 | 2006 | 2001 |
| San Luis | 13 | 2021 | 2021 |
| Moffat | 12 | 1999 | 1991 |
| Doyle Bridge 2 | 12 | 1999 | 1999 |
| Mcphee Res. | 10 | 2016 | 2012 |
| Kiowa | 9 | 2000 | 2000 |
| Hudson | 8 | 2012 | 2006 |
| Dinosaur | 8 | 2010 | 2010 |
| Doyleville | 8 | 2018 | 1989 |
| Angora | 8 | 2010 | 2009 |
| Mosca | 7 | 1994 | 1994 |
| Fort Morgan | 5 | 2001 | 2001 |
| Julesburg | 5 | 2021 | 2008 |
| Cortez | 5 | 2003 | 1989 |
| Cortez 2 | 4 | 2013 | 2013 |
| Guffey | 3 | 2018 | 2001 |
| Weston Pass | 3 | 2000 | 2000 |
| Alamosa | 3 | 2024 | 1988 |
| Flagler | 3 | 2012 | 2012 |
| Neegrande | 3 | 2018 | 2018 |
| Tarryall | 2 | 2008 | 2008 |
| Lay | 2 | 2001 | 2001 |
| Arsenal 2 | 1 | 2022 | 2022 |
| Edison | 1 | 2023 | 2023 |
| Tincup | 1 | 2018 | 1996 |
White-faced Ibis Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.