Species · Washington · BBS 2025 Release · 1966–2024
Ferruginous Hawk Population Trend in Washington
Ferruginous Hawk in Washington has fallen sharply: down 64% on the route-weighted index since 1982.
-64%Since 1982
13Routes In State
34Years
Notable Ferruginous Hawk Trends in Washington
long arc declinecomputed index
Ferruginous Hawk has fallen sharply in Washington: down 64% on the route-weighted index since 1982.
Ferruginous Hawk Population Forecast in Washington
If the recent trend holds, Ferruginous Hawk in Washington is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.06). A 5-year backtest shows a typical error of ±38.6%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2029
0.01Projected 2029 index
0.00–0.0695% range
±38.6%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.02 | 0.00 | 0.06 |
| 2026 | 0.01 | 0.00 | 0.06 |
| 2027 | 0.01 | 0.00 | 0.06 |
| 2028 | 0.01 | 0.00 | 0.06 |
| 2029 | 0.01 | 0.00 | 0.06 |
Ferruginous Hawk Survey Routes in Washington
| Hanford Site | 2 | 1996 | 1988 |
| Keystone | 2 | 2024 | 1998 |
| Hatton | 1 | 1993 | 1992 |
| Sulphur | 1 | 2008 | 2008 |
| Wilbur | 1 | 2002 | 2002 |
| Odessa | 1 | 2022 | 2022 |
| Othello | 1 | 1986 | 1986 |
| Prescott | 1 | 1997 | 1982 |
| Horn Rapids | 1 | 2017 | 2005 |
| Mesa | 1 | 1995 | 1995 |
| Connell | 1 | 2009 | 1975 |
| Blewett Pass | 1 | 2004 | 2004 |
| Richland | 1 | 2011 | 2006 |
Ferruginous Hawk Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.