Species · BCR 13 · BBS 2025 Release · 1966–2024
Common Merganser In Lower Great Lakes / St. Lawrence Plain
Common Merganser in Lower Great Lakes / St. Lawrence Plain has held roughly steady: down 6% on the route-weighted index since 1989.
-6%Since 1989
27Routes In Region
33Years
Notable Signals
No notable trend signals for Common Merganser in Lower Great Lakes / St. Lawrence Plain. See the full index history below.
Forecast
If the recent trend holds, Common Merganser in Lower Great Lakes / St. Lawrence Plain is projected to stay roughly flat through 2029, near 0.12 (95% range 0.00–0.32). A 5-year backtest shows a typical error of ±58.3%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2029
0.12Projected 2029 index
0.00–0.3295% range
±58.3%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.12 | 0.00 | 0.31 |
| 2026 | 0.12 | 0.00 | 0.31 |
| 2027 | 0.12 | 0.00 | 0.31 |
| 2028 | 0.12 | 0.00 | 0.31 |
| 2029 | 0.12 | 0.00 | 0.32 |
Routes In Lower Great Lakes / St. Lawrence Plain
| Harris Hill | NEW-YORK | 8 | 2019 |
| Austerlitz | NEW-YORK | 5 | 2007 |
| Ferris Crnrs | PENNSYLVANIA | 5 | 2021 |
| Colchester | VERMONT | 5 | 2018 |
| Highland | NEW-YORK | 3 | 1997 |
| Macdougall | NEW-YORK | 3 | 2022 |
| Randolph | NEW-YORK | 2 | 2008 |
| Alder Creek | NEW-YORK | 2 | 2004 |
| Oneida | NEW-YORK | 2 | 2009 |
| North Pownal | VERMONT | 2 | 2024 |
| Shaftsbury | VERMONT | 2 | 2023 |
| Catskills | NEW-YORK | 1 | 2003 |
| Ghent | NEW-YORK | 1 | 2007 |
| Duanesburg | NEW-YORK | 1 | 2018 |
| Trumansburg | NEW-YORK | 1 | 2023 |
| Canadice L | NEW-YORK | 1 | 2023 |
| Mt Morris | NEW-YORK | 1 | 2007 |
| Hamburg | NEW-YORK | 1 | 2023 |
| Cherry Hill | NEW-YORK | 1 | 2015 |
| Nashville | NEW-YORK | 1 | 1995 |
| Watertown | NEW-YORK | 1 | 2011 |
| Pulaski | NEW-YORK | 1 | 1992 |
| N Wilmurt | NEW-YORK | 1 | 1992 |
| Salem | NEW-YORK | 1 | 2014 |
| Sugar Grove | PENNSYLVANIA | 1 | 2001 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.