“But then, to our wonderful surprise, they were.” Straddling the border of Minnesota and Wisconsin, the picturesque St. Croix River “has one of the most mussel-rich watersheds in the world,” according ...

The map was unique because instead of highlighting roads or county lines the map was divided into Minnesota’s 80 watersheds — areas of land which drain snowmelt and rain to a common point.

Flooding hasn’t been a problem along the Minnesota stretch of the Mississippi ... which Clark said poses risks to the Mississippi and St. Croix River watersheds. This story was originally ...