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Vermillion and vicinity - RD12124 - USD - Richardson Collection - Digital Library of South Dakota (DLSD) In late March to early April of 1881, catastrophe struck Vermillion, Dakota Territory then located on a peninsula between the Vermillion and Missouri Rivers. Large ice floes and heavy snow melts destroyed three-quarters of the city. In addition, the flood caused the Missouri River and Vermillion River to change their courses dramatically. Vermillion was no longer a river t