Species · Idaho · BBS 2025 Release · 1966–2024
Vaux's Swift Population Trend in Idaho
Vaux's Swift in Idaho has collapsed: down 76% on the route-weighted index since 1978.
-76%Since 1978
20Routes In State
42Years
Notable Vaux's Swift Trends in Idaho
long arc declinecomputed index
Vaux's Swift has collapsed in Idaho: down 76% on the route-weighted index since 1978.
Vaux's Swift Population Forecast in Idaho
If the recent trend holds, Vaux's Swift in Idaho is projected to fall about 74% by 2029 — from 0.20 in 2024 to a central estimate of 0.05 (95% range 0.00–0.31). A 5-year backtest shows a typical error of ±82.9%, with 100% of held-out values landing inside the 95% band.
-74%Change by 2029
0.05Projected 2029 index
0.00–0.3195% range
±82.9%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.08 | 0.00 | 0.34 |
| 2026 | 0.07 | 0.00 | 0.33 |
| 2027 | 0.07 | 0.00 | 0.32 |
| 2028 | 0.06 | 0.00 | 0.32 |
| 2029 | 0.05 | 0.00 | 0.31 |
Vaux's Swift Survey Routes in Idaho
| Baldy Mountain | 12 | 2015 | 2015 |
| Centerville | 8 | 2008 | 2008 |
| Grangeville | 6 | 2007 | 1986 |
| Coolin | 5 | 2024 | 2018 |
| Naples | 2 | 2016 | 1973 |
| Mivoden | 2 | 2022 | 1978 |
| Lolo Pass | 2 | 2019 | 1992 |
| Cascade | 2 | 1984 | 1984 |
| Avery | 1 | 2023 | 1984 |
| Gifford | 1 | 2009 | 1991 |
| Nezperce | 1 | 2007 | 1992 |
| Golden | 1 | 2009 | 1993 |
| N Fork Cda R | 1 | 2016 | 1994 |
| Rochat Divde | 1 | 2016 | 1996 |
| Marble Creek | 1 | 2014 | 1988 |
| Pierce | 1 | 2005 | 1990 |
| Salmon River | 1 | 2018 | 1988 |
| Burgdorf | 1 | 1989 | 1989 |
| Crane Creek | 1 | 2007 | 2007 |
| Cabarton | 1 | 1997 | 1987 |
Vaux's Swift Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.