Most a long, long time ago.
30. Hurricane Harvey – 2017
29. Los Angeles flood – 1938
28. Buffalo Creek flood – 1972
27. Hurricane Agnes flood – 1972
26. Southeast U.S. floods – 1998
25. Mill River Dam – 1874
24. Big Thompson Canyon Flood – 1976
23. Pacific tsunami – 1946
22. Brazos River Flood – 1913
21. Floods in eastern U.S. – 1996
20. East Coast floods – 1955
19. Great Northeast Flood – 1936
18. Texas flood – 1921
17. Superstorm Sandy – 2012
16. Black Hills Flood – 1972
15. Mississippi flood – 1927
14. Hurricane Camille and flooding – 1969
13. Brazos River flood – 1899
12. Oregon Heppner flash flood – 1903
11. Miami hurricane and flooding – 1926
10. The Ohio River Flood – 1937
9. Labor Day Hurricane – 1935
8. St. Francis Dam failure…
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