BirdAnalyst
Species · BCR 32 · BBS 2025 Release · 1966–2024

Bank Swallow In Coastal California

All regionsCoastal CaliforniaAerial insectivores

Bank Swallow in Coastal California has collapsed: down 95% on the route-weighted index since 1972.

-95%Since 1972
11Routes In Region
32Years

Notable Signals

long arc declinecomputed index

Bank Swallow has collapsed in Coastal California: down 95% on the route-weighted index since 1972.

Forecast

If the recent trend holds, Bank Swallow in Coastal California is projected to stay roughly flat through 2026, near 0.46 (95% range 0.00–2.3). A 5-year backtest shows a typical error of ±4980.1%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2026
0.46Projected 2026 index
0.00–2.395% range
±4980.1%Backtest error
19702026
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
20220.510.002.4
20230.490.002.4
20240.480.002.4
20250.470.002.4
20260.460.002.3

Routes In Coastal California

Routes recording Bank Swallow in Coastal California.
GlennCALIFORNIA1101997
JacksonCALIFORNIA311979
OrlandCALIFORNIA101992
AuburnCALIFORNIA41974
HughsonCALIFORNIA31984
ParkfieldCALIFORNIA21977
AdelaidaCALIFORNIA21978
Elizabeth LkCALIFORNIA21970
Red BluffCALIFORNIA12021
PenningtonCALIFORNIA11991
GreenfieldCALIFORNIA12015

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