Species · Oregon · BBS 2025 Release · 1966–2024
American Bittern Population Trend in Oregon
American Bittern in Oregon has fallen sharply: down 61% on the route-weighted index since 1973.
-61%Since 1973
22Routes In State
47Years
Notable American Bittern Trends in Oregon
long arc declinecomputed index
American Bittern has fallen sharply in Oregon: down 61% on the route-weighted index since 1973.
American Bittern Population Forecast in Oregon
If the recent trend holds, American Bittern in Oregon is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.24). A 5-year backtest shows a typical error of ±76.3%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2029
0.00Projected 2029 index
0.00–0.2495% range
±76.3%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.02 | 0.00 | 0.25 |
| 2026 | 0.01 | 0.00 | 0.25 |
| 2027 | 0.01 | 0.00 | 0.24 |
| 2028 | 0.01 | 0.00 | 0.24 |
| 2029 | 0.00 | 0.00 | 0.24 |
American Bittern Survey Routes in Oregon
| Merrill | 4 | 2013 | 1998 |
| Warner Vally | 4 | 1999 | 1996 |
| Bly | 2 | 2001 | 2001 |
| Tualatin | 1 | 1994 | 1994 |
| Nicolai Mtn. | 1 | 1997 | 1997 |
| Days Creek | 1 | 2011 | 2011 |
| Modoc Point | 1 | 1984 | 1970 |
| Alvord Lake | 1 | 1972 | 1972 |
| Bly 2 | 1 | 2021 | 2007 |
| Adair | 1 | 2012 | 1997 |
| Dayton | 1 | 1993 | 1993 |
| Elk Lake | 1 | 2024 | 1976 |
| Silver Creek | 1 | 2018 | 2018 |
| Princeton | 1 | 1984 | 1975 |
| Fish Lake | 1 | 2024 | 1972 |
| Coquille | 1 | 2023 | 2023 |
| Harney Lake | 1 | 2002 | 1999 |
| Catlow Rim | 1 | 2015 | 2015 |
| Crooked Riv. | 1 | 2002 | 2002 |
| Sheaville | 1 | 2022 | 2012 |
| Chinchalo | 1 | 2022 | 1996 |
| Sams Valley | 1 | 1994 | 1994 |
American Bittern Population Trend in Other States
alaskacaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaslouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-dakotaohiooklahomapennsylvaniasouth-carolinasouth-dakotatexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.