Species · Washington · BBS 2025 Release · 1966–2024
Common Loon Population Trend in Washington
Common Loon in Washington has edged down: down 11% on the route-weighted index since 1977.
-11%Since 1977
27Routes In State
41Years
Notable Common Loon Trends in Washington
No notable trend signals for Common Loon in Washington. See the full index history below.
Common Loon Population Forecast in Washington
If the recent trend holds, Common Loon in Washington is projected to fall about 65% by 2029 — from 0.10 in 2024 to a central estimate of 0.04 (95% range 0.00–0.11). A 5-year backtest shows a typical error of ±39.3%, with 80% of held-out values landing inside the 95% band.
-65%Change by 2029
0.04Projected 2029 index
0.00–0.1195% range
±39.3%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.04 | 0.00 | 0.11 |
| 2026 | 0.04 | 0.00 | 0.11 |
| 2027 | 0.04 | 0.00 | 0.11 |
| 2028 | 0.04 | 0.00 | 0.11 |
| 2029 | 0.04 | 0.00 | 0.11 |
Common Loon Survey Routes in Washington
| Raymond 2 | 5 | 2024 | 2024 |
| Ozette | 4 | 2009 | 1976 |
| Laurier | 3 | 2022 | 1999 |
| Ardenvoir | 2 | 1984 | 1984 |
| Ilwaco | 2 | 1977 | 1977 |
| Cedar Falls | 2 | 2013 | 2011 |
| Port Angeles | 1 | 1971 | 1971 |
| Warm Beach | 1 | 2007 | 2007 |
| Hanford Site | 1 | 1992 | 1992 |
| Brewster | 1 | 2014 | 1979 |
| Keller | 1 | 1971 | 1971 |
| No Cascades | 1 | 2007 | 1988 |
| Cougar | 1 | 1990 | 1988 |
| Rimrock | 1 | 2014 | 1991 |
| Sullivan Lake 2 | 1 | 2015 | 2005 |
| Tonasket | 1 | 2018 | 2018 |
| Twin Lakes | 1 | 2024 | 1983 |
| Cusick | 1 | 2000 | 2000 |
| Ronald | 1 | 2015 | 2015 |
| Packwood | 1 | 1987 | 1987 |
| Nighthawk | 1 | 2019 | 1996 |
| Curlew | 1 | 2013 | 2005 |
| Horn Rapids | 1 | 2021 | 2021 |
| Raymond | 1 | 2007 | 1993 |
| Bay View | 1 | 2015 | 1997 |
Common Loon Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.