BirdAnalyst
Species · BCR 15 · BBS 2025 Release · 1966–2024

White-throated Swift In Sierra Nevada

All regionsSierra NevadaAerial insectivores

White-throated Swift in Sierra Nevada has fallen sharply: down 64% on the route-weighted index since 1974.

-64%Since 1974
19Routes In Region
51Years

Notable Signals

long arc declinecomputed index

White-throated Swift has fallen sharply in Sierra Nevada: down 64% on the route-weighted index since 1974.

Forecast

If the recent trend holds, White-throated Swift in Sierra Nevada is projected to fall about 84% by 2029 — from 2.1 in 2024 to a central estimate of 0.34 (95% range 0.00–7.6). A 5-year backtest shows a typical error of ±83.2%, with 100% of held-out values landing inside the 95% band.

-84%Change by 2029
0.34Projected 2029 index
0.00–7.695% range
±83.2%Backtest error
19722029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.890.008.2
20260.750.008.0
20270.610.007.9
20280.470.007.8
20290.340.007.6

Routes In Sierra Nevada

Routes recording White-throated Swift in Sierra Nevada.
Kings CanyonCALIFORNIA312024
KernvilleCALIFORNIA202008
Silver CityCALIFORNIA112013
WawonaCALIFORNIA72024
Hat CreekCALIFORNIA62000
DardanelleCALIFORNIA31974
Lassen ParkCALIFORNIA21981
Bass LakeCALIFORNIA22019
WoodfordsCALIFORNIA22021
Tuolumne GroveCALIFORNIA22024
Forest HillCALIFORNIA22009
Higgins CornCALIFORNIA11973
DownievilleCALIFORNIA11975
RivertonCALIFORNIA11974
LakeshoreCALIFORNIA12009
Chaos CraterCALIFORNIA11997
CoultervilleCALIFORNIA12008
CrestviewCALIFORNIA12021
StrawberryCALIFORNIA12018

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.