Species · Washington · BBS 2025 Release · 1966–2024
Olive-sided Flycatcher Population Trend in Washington
Olive-sided Flycatcher in Washington has fallen sharply: down 59% on the route-weighted index since 1970.
-59%Since 1970
76Routes In State
56Years
Notable Olive-sided Flycatcher Trends in Washington
long arc declinecomputed index
Olive-sided Flycatcher has fallen sharply in Washington: down 59% on the route-weighted index since 1970.
Olive-sided Flycatcher Population Forecast in Washington
If the recent trend holds, Olive-sided Flycatcher in Washington is projected to fall about 75% by 2029 — from 1.6 in 2024 to a central estimate of 0.40 (95% range 0.00–1.7). A 5-year backtest shows a typical error of ±64.1%, with 100% of held-out values landing inside the 95% band.
-75%Change by 2029
0.40Projected 2029 index
0.00–1.795% range
±64.1%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.58 | 0.00 | 1.9 |
| 2026 | 0.54 | 0.00 | 1.8 |
| 2027 | 0.49 | 0.00 | 1.8 |
| 2028 | 0.44 | 0.00 | 1.7 |
| 2029 | 0.40 | 0.00 | 1.7 |
Olive-sided Flycatcher Survey Routes in Washington
| Deer Park | 14 | 2006 | 2002 |
| Warm Beach | 8 | 2017 | 1968 |
| Vashon Is. | 8 | 2024 | 1995 |
| Spring Lake | 8 | 2024 | 1982 |
| Hurricane Rg | 8 | 2024 | 1992 |
| Rimrock | 7 | 2024 | 1968 |
| Camas | 6 | 2009 | 1977 |
| Ilwaco | 6 | 2024 | 1975 |
| Snowden | 5 | 2024 | 1971 |
| Newhalem | 4 | 2024 | 1969 |
| Mcchord | 4 | 2015 | 1996 |
| Raymond 2 | 4 | 2024 | 2022 |
| Packwood | 4 | 2024 | 1975 |
| Deception | 4 | 2018 | 1992 |
| Cloverland | 4 | 2024 | 1993 |
| Port Angeles | 3 | 2024 | 1970 |
| Ronald | 3 | 2024 | 1973 |
| Mazama | 3 | 2022 | 1993 |
| Yakima | 3 | 1996 | 1996 |
| Warm Beach 2 | 3 | 2024 | 2018 |
| Carnation | 3 | 2024 | 1989 |
| Montesand | 2 | 2024 | 1992 |
| Keller | 2 | 1983 | 1968 |
| Chewelah | 2 | 2008 | 1977 |
| Index | 2 | 1970 | 1968 |
Olive-sided Flycatcher Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.