Species · BCR 13 · BBS 2025 Release · 1966–2024
Hooded Merganser In Lower Great Lakes / St. Lawrence Plain
Hooded Merganser in Lower Great Lakes / St. Lawrence Plain has fallen sharply: down 52% on the route-weighted index since 1985.
-52%Since 1985
20Routes In Region
29Years
Notable Signals
long arc declinecomputed index
Hooded Merganser has fallen sharply in Lower Great Lakes / St. Lawrence Plain: down 52% on the route-weighted index since 1985.
Forecast
If the recent trend holds, Hooded Merganser in Lower Great Lakes / St. Lawrence Plain is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.09). A 5-year backtest shows a typical error of ±48.3%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2029
0.01Projected 2029 index
0.00–0.0995% range
±48.3%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.02 | 0.00 | 0.09 |
| 2026 | 0.02 | 0.00 | 0.09 |
| 2027 | 0.01 | 0.00 | 0.09 |
| 2028 | 0.01 | 0.00 | 0.09 |
| 2029 | 0.01 | 0.00 | 0.09 |
Routes In Lower Great Lakes / St. Lawrence Plain
| Trumansburg | NEW-YORK | 8 | 2000 |
| Duanesburg | NEW-YORK | 3 | 1997 |
| Oriskany Fls | NEW-YORK | 2 | 2022 |
| Hamburg | NEW-YORK | 2 | 2013 |
| Cherry Hill | NEW-YORK | 2 | 1982 |
| Ferris Crnrs | PENNSYLVANIA | 2 | 2004 |
| Highland | NEW-YORK | 1 | 2012 |
| Castile | NEW-YORK | 1 | 2010 |
| E Youngstown | NEW-YORK | 1 | 2013 |
| N Wilmurt | NEW-YORK | 1 | 1985 |
| North Easton | NEW-YORK | 1 | 2006 |
| Ogdensburg | NEW-YORK | 1 | 2018 |
| Philadelphia | NEW-YORK | 1 | 2019 |
| Pittsfield | OHIO | 1 | 2011 |
| Hiram | OHIO | 1 | 2007 |
| Espyville | PENNSYLVANIA | 1 | 2013 |
| Harmonsburg | PENNSYLVANIA | 1 | 2017 |
| Teepleville | PENNSYLVANIA | 1 | 2009 |
| Shaftsbury | VERMONT | 1 | 2024 |
| Grand Isle | VERMONT | 1 | 2024 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.