Species · BCR 10 · BBS 2025 Release · 1966–2024
Hooded Merganser In Northern Rockies
Hooded Merganser in Northern Rockies has declined: down 39% on the route-weighted index since 1991.
-39%Since 1991
16Routes In Region
26Years
Notable Signals
No notable trend signals for Hooded Merganser in Northern Rockies. See the full index history below.
Forecast
If the recent trend holds, Hooded Merganser in Northern Rockies is projected to stay roughly flat through 2029, near 0.02 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±43.7%, with 80% of held-out values landing inside the 95% band.
n/aChange by 2029
0.02Projected 2029 index
0.00–0.0595% range
±43.7%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.02 | 0.00 | 0.05 |
| 2026 | 0.02 | 0.00 | 0.05 |
| 2027 | 0.02 | 0.00 | 0.05 |
| 2028 | 0.02 | 0.00 | 0.05 |
| 2029 | 0.02 | 0.00 | 0.05 |
Routes In Northern Rockies
| Noxon | MONTANA | 5 | 2019 |
| Twin Lakes | WASHINGTON | 4 | 1999 |
| Naples | IDAHO | 2 | 2023 |
| Kalispell | MONTANA | 2 | 2015 |
| Glen | MONTANA | 2 | 2009 |
| Willow Creek 2 | MONTANA | 2 | 1994 |
| Clark | WYOMING | 2 | 2018 |
| Harmony | WYOMING | 2 | 1982 |
| Lolo Pass | IDAHO | 1 | 2008 |
| Elliston | MONTANA | 1 | 1991 |
| Ninemile | MONTANA | 1 | 2024 |
| Omak Creek | WASHINGTON | 1 | 2024 |
| Laurier | WASHINGTON | 1 | 2021 |
| L Pend O Nwr | WASHINGTON | 1 | 1997 |
| Lovell | WYOMING | 1 | 2019 |
| Seedskadee | WYOMING | 1 | 2016 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.