Species · Washington · BBS 2025 Release · 1966–2024
Gray Partridge Population Trend in Washington
Gray Partridge in Washington has fallen sharply: down 56% on the route-weighted index since 1971.
-56%Since 1971
23Routes In State
47Years
Notable Gray Partridge Trends in Washington
long arc declinecomputed index
Gray Partridge has fallen sharply in Washington: down 56% on the route-weighted index since 1971.
Gray Partridge Population Forecast in Washington
If the recent trend holds, Gray Partridge in Washington is projected to fall about 66% by 2029 — from 0.09 in 2024 to a central estimate of 0.03 (95% range 0.00–0.24). A 5-year backtest shows a typical error of ±48.9%, with 100% of held-out values landing inside the 95% band.
-66%Change by 2029
0.03Projected 2029 index
0.00–0.2495% range
±48.9%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.04 | 0.00 | 0.26 |
| 2026 | 0.04 | 0.00 | 0.25 |
| 2027 | 0.04 | 0.00 | 0.25 |
| 2028 | 0.03 | 0.00 | 0.24 |
| 2029 | 0.03 | 0.00 | 0.24 |
Gray Partridge Survey Routes in Washington
| Harrington | 10 | 2004 | 1977 |
| Moses Lake | 4 | 2009 | 2005 |
| Connell | 3 | 1988 | 1988 |
| Ewan | 3 | 1995 | 1985 |
| Keystone | 3 | 2023 | 1996 |
| Brewster | 2 | 2015 | 1977 |
| Selah | 2 | 2001 | 2001 |
| Reardan | 2 | 2024 | 1968 |
| Asotin | 2 | 2024 | 1971 |
| Tonasket | 2 | 1991 | 1991 |
| Hartline | 2 | 2021 | 1999 |
| Malden | 2 | 2005 | 1998 |
| Moses Coulee | 2 | 2021 | 1995 |
| Mercer | 1 | 2018 | 1978 |
| Sulphur | 1 | 2002 | 2001 |
| Quincy | 1 | 1998 | 1982 |
| Wilbur | 1 | 2016 | 1983 |
| Prescott | 1 | 2022 | 1984 |
| Nighthawk | 1 | 2024 | 2015 |
| Waitsburg | 1 | 2001 | 2001 |
| Pomeroy | 1 | 2022 | 2005 |
| Odessa | 1 | 2021 | 2000 |
| Cloverland | 1 | 2014 | 2010 |
Gray Partridge Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.