Nation Flash Floods Swamp Duluth, Minn. June 21, 2012 prev3 of 9next Bob King / Duluth News Tribune via APRunoff from streams that surged during Wednesday's storm tints the water in St. Louis Bay in Duluth, Minn., on June 20. At left is the Bong Bridge connecting Duluth and Superior, Wis. Share Read Later Heavy rainfall flooded vast swathes of the port city, washing out roads, inundating family homes, and spurring evacuations.