A Minnesota Boat Club eight-man scull plies the waters of the Mississippi River on a training row in St. Paul early Aug. 19, 2009. (John Doman / Pioneer Press) Wondering how long the Mississippi ...

(Ginger Pinson / Pioneer Press) In 1926, the Minnesota Department of Health declared the stretch of the Mississippi River that ran through St. Paul a threat to the public’s well-being.

Flooding hasn’t been a problem along the Minnesota stretch of the Mississippi this year. But the river faces other challenges, including pollution from agriculture, said Whitney Clark ...