Species · Wyoming · BBS 2025 Release · 1966–2024
Bufflehead Population Trend in Wyoming
Bufflehead in Wyoming has fallen sharply: down 56% on the route-weighted index since 1989.
-56%Since 1989
9Routes In State
35Years
Notable Bufflehead Trends in Wyoming
long arc declinecomputed index
Bufflehead has fallen sharply in Wyoming: down 56% on the route-weighted index since 1989.
Bufflehead Population Forecast in Wyoming
If the recent trend holds, Bufflehead in Wyoming is projected to stay roughly flat through 2028, near 0.04 (95% range 0.00–0.27). A 5-year backtest shows a typical error of ±171.7%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2028
0.04Projected 2028 index
0.00–0.2795% range
±171.7%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2024 | 0.07 | 0.00 | 0.29 |
| 2025 | 0.06 | 0.00 | 0.29 |
| 2026 | 0.05 | 0.00 | 0.28 |
| 2027 | 0.04 | 0.00 | 0.27 |
| 2028 | 0.04 | 0.00 | 0.27 |
Bufflehead Survey Routes in Wyoming
| Yellowstone | 9 | 2022 | 1988 |
| Hayden Val | 7 | 1985 | 1985 |
| Mammoth | 2 | 2006 | 1996 |
| Hunter Peak | 1 | 2006 | 2006 |
| Ne Entrance | 1 | 1999 | 1999 |
| Walcott | 1 | 2017 | 1992 |
| Fiddler Lk | 1 | 2005 | 2002 |
| Bucknum | 1 | 1999 | 1999 |
| Colter Bay 2 | 1 | 2023 | 2023 |
Bufflehead Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.