Species · Massachusetts · BBS 2025 Release · 1966–2024
American Bittern Population Trend in Massachusetts
American Bittern in Massachusetts has declined: down 28% on the route-weighted index since 1972.
-28%Since 1972
12Routes In State
22Years
Notable American Bittern Trends in Massachusetts
No notable trend signals for American Bittern in Massachusetts. See the full index history below.
American Bittern Population Forecast in Massachusetts
If the recent trend holds, American Bittern in Massachusetts is projected to fall about 26% by 2028 — from 0.08 in 2023 to a central estimate of 0.06 (95% range 0.00–0.13). A 5-year backtest shows a typical error of ±36.4%, with 100% of held-out values landing inside the 95% band.
-26%Change by 2028
0.06Projected 2028 index
0.00–0.1395% range
±36.4%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2024 | 0.06 | 0.00 | 0.14 |
| 2025 | 0.06 | 0.00 | 0.14 |
| 2026 | 0.06 | 0.00 | 0.13 |
| 2027 | 0.06 | 0.00 | 0.13 |
| 2028 | 0.06 | 0.00 | 0.13 |
American Bittern Survey Routes in Massachusetts
| E Dennis | 1 | 1974 | 1974 |
| Ware River | 1 | 1994 | 1994 |
| Prattville | 1 | 1972 | 1972 |
| Newburyport | 1 | 2008 | 1985 |
| Maynard | 1 | 1996 | 1996 |
| E Pepperell | 1 | 1989 | 1975 |
| N Orange | 1 | 2023 | 1972 |
| Chesterfield | 1 | 2008 | 1971 |
| Cheshire | 1 | 1969 | 1969 |
| Warren 2 | 1 | 2017 | 2017 |
| Sheffield | 1 | 2000 | 2000 |
| Monterey | 1 | 2019 | 2019 |
American Bittern Population Trend in Other States
alaskacaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaslouisianamainemarylandmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.