one of california’s deadliest disasters took place here in this canyon. the st. francis dam disaster happened here in san francisquito canyon near santa clarita on march 12, 1928, when a dam built under william mulholland collapsed just before midnight. what followed was a 140-foot wall of water and a catastrophic flood that tore through the santa clara river valley, claiming more than 400 lives and sending water and debris all the way to the pacific ocean. follow for more lost history told on location 👀 #losthistory #stfrancisdam #californiahistory #losangeles #santaclarita