Was that a semi tractor-trailer delivering road salt? It very well good have been. Minnesota Department of Transportation is already preparing for winter. Delivery of road salt for snow and ice season is being delivered. Did you know that summer is really a good time to deliver salt? The salt is dry and can be moved efficiently to storage areas. So the salt is hauled from Mississippi River barges docked in Winona and the salt could come from Michigan, Missouri or even Kansas. Who knew?