Rising floodwaters on the Watonwan River forced the evacuation of more than a dozen people in Garden City.
Authorities say an ice dam let loose upriver, sending water and sheets of ice over the riverbanks and into neighborhoods.
Flood levels hit more than 5 feet Wednesday and officials say the current was so strong it washed away a city street. City leaders say it will likely take months to rebuild.
The rising water stranded some and many have basements submerged.