where does the mississippi river ever freeze
The Red River in Minnesota and Canada every dozen years freezes and then thaws unevenly causing floods unless towns build dikes or huge diversion dams like at Winnipeg in Canada. Now in 2009 the Mississippi River freezes north of Iowa, and south of Iowa there are patches of freezing. Around 1900 in St. Louis the river froze which surprised most there although it was really an ice dam of millions of icebergs, and people walked across this ice gorge of ice jams.