Floods in the United States are generally caused by excessive rainfall, excessive snowmelt, and dam failure. Below is a list of flood events that were of significant impact to the country during the 20th century, from 1900 through 1999, inclusive. Decade of the 1900s Kansas River – May 1903 The greatest flood of the Kansas River on record of in the memory of the oldest inhabitants living along the stream occurred May 23 to June 13, 1903. Pacolet River (South Carolina) – June 1903 On June 6, 1903, after heavy rain, the Pacolet River destroyed or heavily damaged six large cotton mills, their associated dams, and 70 houses in the mill villages of Converse, Clifton, and Pacolet, South Carolina. Approximately 100 people were killed. Heppner flood – June 1903 The third deadliest flash flood in US history, the normally placid Willow Creek burst its banks during an intense rain and hail storm. The city of Heppner, at the foothills of the Blue Mountains in eastern Oregon, was almost completely destroyed. 220 of Heppner's 1,400 residents died in the flood. Sacramento River Flood – February 1904 From February 15 to the end of March, 1904 occurred the most destructive flood as far as property was concerned in the recorded history of Sacramento. The greatest known flood occurred forty-odd years before, In January, 1862 and was due to rainfall, the precipitation in December, 1861 and January, 1962 just prior to it having been 23.62 inches. This flood filled the entire flood plain, and was not limited , as was the later one, by the reclamation of large tracts of bottom land, nor was the channel below the mouth of the Feather River then filled with mining debris as it is now. Susquehanna River – March 1904 Due mainly to ice gorges. Mohawk River – March 1904 From March 25 to 31, 1904, there occurred a flood on Mohawk River, in New York State, which, while not the largest and most destructive in the recorded history of this stream, attained a maximum discharge on March 26 of 20.84 cubic feet per second per square mile. Grand River – March 1904 Due mainly to the rapid melting of snow, flooding was more significant along the Grand, Saginaw, Kalamazoo, and River Raisin river basins than the St. Joseph and Huron River basins. In Lansing, it was the worst flood in the previous 135 years of