Species · Idaho · BBS 2025 Release · 1966–2024
California Gull Population Trend in Idaho
California Gull in Idaho has collapsed: down 94% on the route-weighted index since 1971.
-94%Since 1971
26Routes In State
54Years
Notable California Gull Trends in Idaho
long arc declinecomputed index
California Gull has collapsed in Idaho: down 94% on the route-weighted index since 1971.
California Gull Population Forecast in Idaho
If the recent trend holds, California Gull in Idaho is projected to fall about 100% by 2029 — from 0.44 in 2024 to a central estimate of 0.00 (95% range 0.00–30). A 5-year backtest shows a typical error of ±3575.2%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2029
0.00Projected 2029 index
0.00–3095% range
±3575.2%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.00 | 0.00 | 30 |
| 2026 | 0.00 | 0.00 | 30 |
| 2027 | 0.00 | 0.00 | 30 |
| 2028 | 0.00 | 0.00 | 30 |
| 2029 | 0.00 | 0.00 | 30 |
California Gull Survey Routes in Idaho
| Henry | 123 | 1983 | 1973 |
| Cascade | 120 | 1984 | 1983 |
| Springfield | 65 | 2018 | 1969 |
| Pocatello | 30 | 2019 | 1979 |
| Blacks Creek | 23 | 2015 | 1987 |
| Mud Lake | 22 | 2018 | 1988 |
| Tractor Flat | 11 | 2024 | 1986 |
| Blackft Res | 8 | 2018 | 1984 |
| Glenns Ferry | 8 | 1986 | 1986 |
| Craters | 6 | 1996 | 1987 |
| Circular Bu | 5 | 2003 | 2003 |
| Dubois | 5 | 1990 | 1969 |
| Alturas | 5 | 1969 | 1969 |
| Acequia | 3 | 2012 | 1979 |
| Preston | 3 | 2017 | 1988 |
| Cape Horn | 2 | 1997 | 1997 |
| Cedar Hill | 2 | 2021 | 1990 |
| Kyle Canyon | 1 | 1986 | 1986 |
| Leadore | 1 | 2012 | 2012 |
| Ririe | 1 | 1996 | 1974 |
| Crane Creek | 1 | 1991 | 1988 |
| Iron Springs | 1 | 2011 | 2005 |
| Featherville | 1 | 2003 | 1994 |
| Picabo | 1 | 2014 | 1990 |
| Cabarton | 1 | 2000 | 1987 |
California Gull Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.