Species · Montana · BBS 2025 Release · 1966–2024
Pied-billed Grebe Population Trend in Montana
Pied-billed Grebe in Montana has declined: down 27% on the route-weighted index since 1972.
-27%Since 1972
36Routes In State
52Years
Notable Pied-billed Grebe Trends in Montana
No notable trend signals for Pied-billed Grebe in Montana. See the full index history below.
Pied-billed Grebe Population Forecast in Montana
If the recent trend holds, Pied-billed Grebe in Montana is projected to fall about 60% by 2029 — from 0.14 in 2024 to a central estimate of 0.06 (95% range 0.00–0.24). A 5-year backtest shows a typical error of ±28.3%, with 100% of held-out values landing inside the 95% band.
-60%Change by 2029
0.06Projected 2029 index
0.00–0.2495% range
±28.3%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.07 | 0.00 | 0.25 |
| 2026 | 0.06 | 0.00 | 0.25 |
| 2027 | 0.06 | 0.00 | 0.25 |
| 2028 | 0.06 | 0.00 | 0.24 |
| 2029 | 0.06 | 0.00 | 0.24 |
Pied-billed Grebe Survey Routes in Montana
| Kalispell | 4 | 2024 | 1971 |
| Albion | 4 | 2014 | 1994 |
| Augusta | 3 | 2024 | 1979 |
| Cleveland | 2 | 2017 | 2017 |
| Malta | 2 | 1987 | 1975 |
| Oswego | 2 | 1997 | 1978 |
| Roy | 2 | 2017 | 1989 |
| Savage | 2 | 1980 | 1980 |
| Forsyth | 2 | 2019 | 2019 |
| Saco | 2 | 2023 | 2015 |
| Westby | 2 | 2024 | 2015 |
| St Mary | 1 | 1995 | 1987 |
| Hay Lake | 1 | 1994 | 1994 |
| Sunburst | 1 | 2004 | 2004 |
| Virgelle | 1 | 2023 | 2019 |
| Glen | 1 | 2019 | 2019 |
| Willow Creek 2 | 1 | 2006 | 2006 |
| Polson | 1 | 1994 | 1990 |
| Arlee | 1 | 1990 | 1990 |
| Leroy | 1 | 2019 | 2019 |
| Brusett | 1 | 2024 | 1982 |
| Jordan | 1 | 2018 | 1968 |
| Two Dot | 1 | 2017 | 1980 |
| Flatwillow | 1 | 1991 | 1991 |
| Ingomar | 1 | 2016 | 1976 |
Pied-billed Grebe Population Trend in Other States
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Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.