Check out these floods named the 10 deadliest in U.S. history.
10. Buffalo Creek Flood (1972) -- An estimated 118 people died after a slag pile dam in West Virginia collapsed under torrential rains.
9. Big Thompson Flood (1976) -- A flash flood in Big Thompson Canyon west of Loveland, Colo., killed 139 people.
8. (tie) Heppner Flood (1903) -- Two-hundred people were killed when a flash flood swept away a third of the town of Willow Creek, Ore., in 1903.
8. Mississippi Flood (1912) -- The Mississippi River overflowed its banks, killing an estimated 200 people along the river and causing $45 million in damage.
8. Missouri River Flood (1903) -- Heavy rains brought flooding that raised the level of the Missouri River 35 feet and killed 200 people.
5. Rapid City Flood (1972) -- Flash flooding killed 237 people in Rapid City, S.D.
4. St. Francis Flood (1928) -- An estimated 450 perish when the St. Francis Dam collapses in Santa Paula, Calif.