Species · Oregon · BBS 2025 Release · 1966–2024
Lesser Scaup Population Trend in Oregon
Lesser Scaup in Oregon has surged: up 170% on the route-weighted index since 1971.
+170%Since 1971
20Routes In State
45Years
Notable Lesser Scaup Trends in Oregon
long arc increasecomputed index
Lesser Scaup has surged in Oregon: up 170% on the route-weighted index since 1971.
Lesser Scaup Population Forecast in Oregon
If the recent trend holds, Lesser Scaup in Oregon is projected to stay roughly flat through 2029, near 0.23 (95% range 0.00–0.78). A 5-year backtest shows a typical error of ±386.9%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2029
0.23Projected 2029 index
0.00–0.7895% range
±386.9%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.23 | 0.00 | 0.78 |
| 2026 | 0.23 | 0.00 | 0.78 |
| 2027 | 0.23 | 0.00 | 0.78 |
| 2028 | 0.23 | 0.00 | 0.78 |
| 2029 | 0.23 | 0.00 | 0.78 |
Lesser Scaup Survey Routes in Oregon
| Catlow Rim | 34 | 2023 | 1994 |
| Blizzard Gap | 10 | 2017 | 1995 |
| Princeton | 7 | 1975 | 1972 |
| Clover Creek | 6 | 1997 | 1997 |
| Modoc Point | 5 | 2009 | 1974 |
| Fish Lake | 3 | 2024 | 1974 |
| Lapham Res. | 2 | 1998 | 1994 |
| Dell Spring | 2 | 1972 | 1970 |
| Wedderburn | 2 | 1994 | 1994 |
| Bly 2 | 2 | 2015 | 2015 |
| Joseph | 2 | 1994 | 1994 |
| Barnes Val | 2 | 1974 | 1974 |
| Donnelly | 2 | 2006 | 2005 |
| Chinchalo | 2 | 1999 | 1993 |
| Winberry | 1 | 1969 | 1969 |
| Elk Lake | 1 | 1978 | 1978 |
| Warner Vally | 1 | 2024 | 1994 |
| Umatilla | 1 | 1992 | 1992 |
| Sheaville | 1 | 2014 | 2014 |
| Trout Creek | 1 | 1998 | 1998 |
Lesser Scaup Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.