Species · Massachusetts · BBS 2025 Release · 1966–2024
Common Merganser Population Trend in Massachusetts
Common Merganser in Massachusetts has held roughly steady: down 8% on the route-weighted index since 2002.
-8%Since 2002
6Routes In State
17Years
Notable Common Merganser Trends in Massachusetts
No notable trend signals for Common Merganser in Massachusetts. See the full index history below.
Common Merganser Survey Routes in Massachusetts
| Marion | 1 | 1998 | 1998 |
| Belchertown | 1 | 2024 | 2024 |
| Cummington | 1 | 2011 | 2003 |
| Chesterfield | 1 | 2016 | 1989 |
| Cummington 2 | 1 | 2023 | 2017 |
| Hancock | 1 | 2011 | 2010 |
Common Merganser Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.