Species · Washington · BBS 2025 Release · 1966–2024
American Avocet Population Trend in Washington
American Avocet in Washington has fallen sharply: down 62% on the route-weighted index since 1978.
-62%Since 1978
9Routes In State
19Years
Notable American Avocet Trends in Washington
long arc declinecomputed index
American Avocet has fallen sharply in Washington: down 62% on the route-weighted index since 1978.
American Avocet Population Forecast in Washington
If the recent trend holds, American Avocet in Washington is projected to stay roughly flat through 2018, near 0.03 (95% range 0.00–0.12). A 5-year backtest shows a typical error of ±65.8%, with 80% of held-out values landing inside the 95% band.
n/aChange by 2018
0.03Projected 2018 index
0.00–0.1295% range
±65.8%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2014 | 0.04 | 0.00 | 0.13 |
| 2015 | 0.04 | 0.00 | 0.12 |
| 2016 | 0.04 | 0.00 | 0.12 |
| 2017 | 0.04 | 0.00 | 0.12 |
| 2018 | 0.03 | 0.00 | 0.12 |
American Avocet Survey Routes in Washington
| Wapato | 4 | 1994 | 1994 |
| Brewster | 2 | 2013 | 1977 |
| Moses Lake | 2 | 2001 | 1975 |
| Potholes | 2 | 1997 | 1997 |
| Othello | 1 | 1989 | 1981 |
| Columbia Nwr | 1 | 2013 | 1997 |
| Mesa | 1 | 1997 | 1997 |
| Connell | 1 | 2010 | 2010 |
| Keystone | 1 | 2007 | 2007 |
American Avocet Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.