Species · BCR 10 · BBS 2025 Release · 1966–2024
Spruce Grouse In Northern Rockies
Spruce Grouse in Northern Rockies has fallen sharply: down 54% on the route-weighted index since 1995.
-54%Since 1995
12Routes In Region
18Years
Notable Signals
No notable trend signals for Spruce Grouse in Northern Rockies. See the full index history below.
Forecast
If the recent trend holds, Spruce Grouse in Northern Rockies is projected to stay roughly flat through 2021, near 0.01 (95% range 0.00–0.04). A 5-year backtest shows a typical error of ±87%, with 80% of held-out values landing inside the 95% band.
n/aChange by 2021
0.01Projected 2021 index
0.00–0.0495% range
±87%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2017 | 0.01 | 0.00 | 0.04 |
| 2018 | 0.01 | 0.00 | 0.04 |
| 2019 | 0.01 | 0.00 | 0.04 |
| 2020 | 0.01 | 0.00 | 0.04 |
| 2021 | 0.01 | 0.00 | 0.04 |
Routes In Northern Rockies
| Arlee | MONTANA | 2 | 1995 |
| Logan Pass | MONTANA | 2 | 1995 |
| Greenough | MONTANA | 2 | 2004 |
| Mivoden | IDAHO | 1 | 1989 |
| Lolo Pass | IDAHO | 1 | 2012 |
| Burgdorf | IDAHO | 1 | 2015 |
| Yellow Pine | IDAHO | 1 | 2016 |
| St Regis | MONTANA | 1 | 1998 |
| Sula | MONTANA | 1 | 2007 |
| Skalkho-Rye | MONTANA | 1 | 2005 |
| Inside Road | MONTANA | 1 | 2005 |
| Sullivan Lake 2 | WASHINGTON | 1 | 2016 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.