Species · Washington · BBS 2025 Release · 1966–2024
Dusky Grouse Population Trend in Washington
Dusky Grouse in Washington has fallen sharply: down 61% on the route-weighted index since 1992.
-61%Since 1992
10Routes In State
21Years
Notable Dusky Grouse Trends in Washington
long arc declinecomputed index
Dusky Grouse has fallen sharply in Washington: down 61% on the route-weighted index since 1992.
Dusky Grouse Population Forecast in Washington
If the recent trend holds, Dusky Grouse in Washington is projected to stay roughly flat through 2028, near 0.02 (95% range 0.00–0.08). A 5-year backtest shows a typical error of ±42.4%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2028
0.02Projected 2028 index
0.00–0.0895% range
±42.4%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2024 | 0.02 | 0.00 | 0.09 |
| 2025 | 0.02 | 0.00 | 0.09 |
| 2026 | 0.02 | 0.00 | 0.09 |
| 2027 | 0.02 | 0.00 | 0.09 |
| 2028 | 0.02 | 0.00 | 0.08 |
Dusky Grouse Survey Routes in Washington
| Cloverland | 4 | 2017 | 1996 |
| Winthrop | 3 | 2022 | 2018 |
| Omak Creek | 1 | 2022 | 1996 |
| Keller | 1 | 2004 | 1971 |
| Northport | 1 | 2007 | 1998 |
| L. Wenatchee | 1 | 2023 | 2023 |
| L Pend O Nwr | 1 | 2011 | 2011 |
| Curlew | 1 | 2006 | 2004 |
| Sullivan Lake 2 | 1 | 2015 | 2015 |
| Twin Lakes | 1 | 2018 | 2015 |
Dusky Grouse Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.