1974 Blythe, California bus crash
A school bus-type vehicle carrying farm workers fell into a drainage canal near Ripley, California, southwest of Blythe, California, at approximately 6:30 a.m. PST before sunrise on January 15, 1974, killing 19 and injuring 28.
Source: Wikipedia — 1974 Blythe, California bus crash (CC BY-SA 4.0)