Species · Washington · BBS 2025 Release · 1966–2024
Common Poorwill Population Trend in Washington
Common Poorwill in Washington has fallen sharply: down 72% on the route-weighted index since 1983.
-72%Since 1983
13Routes In State
27Years
Notable Common Poorwill Trends in Washington
long arc declinecomputed index
Common Poorwill has fallen sharply in Washington: down 72% on the route-weighted index since 1983.
Common Poorwill Population Forecast in Washington
If the recent trend holds, Common Poorwill in Washington is projected to stay roughly flat through 2028, near 0.01 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±27.2%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2028
0.01Projected 2028 index
0.00–0.0595% range
±27.2%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2024 | 0.01 | 0.00 | 0.05 |
| 2025 | 0.01 | 0.00 | 0.05 |
| 2026 | 0.01 | 0.00 | 0.05 |
| 2027 | 0.01 | 0.00 | 0.05 |
| 2028 | 0.01 | 0.00 | 0.05 |
Common Poorwill Survey Routes in Washington
| Tonasket | 3 | 1983 | 1983 |
| Mazama | 2 | 2001 | 2001 |
| Twisp | 2 | 1991 | 1990 |
| Brewster | 1 | 1994 | 1994 |
| Quincy | 1 | 2013 | 1981 |
| Omak Creek | 1 | 2017 | 2012 |
| Moses Coulee | 1 | 2023 | 1995 |
| Ellensburg | 1 | 1999 | 1999 |
| Ardenvoir | 1 | 1987 | 1987 |
| Lake Chelan | 1 | 2022 | 2009 |
| Nighthawk | 1 | 2018 | 2018 |
| Snowden | 1 | 1971 | 1971 |
| Winthrop | 1 | 2018 | 2012 |
Common Poorwill Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.