Species · Montana · BBS 2025 Release · 1966–2024
American Wigeon Population Trend in Montana
American Wigeon in Montana has declined: down 49% on the route-weighted index since 1971.
-49%Since 1971
59Routes In State
55Years
Notable American Wigeon Trends in Montana
No notable trend signals for American Wigeon in Montana. See the full index history below.
American Wigeon Population Forecast in Montana
If the recent trend holds, American Wigeon in Montana is projected to stay roughly flat through 2029, near 0.49 (95% range 0.00–1.9). A 5-year backtest shows a typical error of ±34.4%, with 100% of held-out values landing inside the 95% band.
-9%Change by 2029
0.49Projected 2029 index
0.00–1.995% range
±34.4%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.56 | 0.00 | 1.9 |
| 2026 | 0.55 | 0.00 | 1.9 |
| 2027 | 0.53 | 0.00 | 1.9 |
| 2028 | 0.51 | 0.00 | 1.9 |
| 2029 | 0.49 | 0.00 | 1.9 |
American Wigeon Survey Routes in Montana
| Dinosaurs H.M. | 28 | 2021 | 2019 |
| Hay Lake | 15 | 2019 | 1989 |
| Shelby | 11 | 2019 | 2015 |
| Sunburst | 10 | 2007 | 1970 |
| Malta | 6 | 2024 | 1975 |
| Two Dot | 6 | 2024 | 1981 |
| Brandenberg | 6 | 2019 | 2019 |
| Glen | 4 | 2017 | 2005 |
| Polson | 4 | 2000 | 1980 |
| Highwood | 4 | 2017 | 1977 |
| Roy | 4 | 2023 | 1991 |
| Shawmut | 4 | 2024 | 1979 |
| Chinook | 4 | 2023 | 2015 |
| Ester Lake | 4 | 2024 | 2015 |
| Sun River | 4 | 2019 | 2019 |
| Virgelle | 3 | 2024 | 1979 |
| Glasgow | 3 | 2024 | 1972 |
| Flatwillow | 3 | 1991 | 1974 |
| Ingomar | 3 | 2024 | 1970 |
| East Glacier Park | 3 | 2022 | 2019 |
| Raynesford | 3 | 2024 | 2019 |
| Wheat Basin | 3 | 2023 | 2017 |
| Whitlash | 3 | 2018 | 2009 |
| Kalispell | 2 | 2016 | 1971 |
| St Mary | 2 | 2008 | 1973 |
American Wigeon Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.