Bird was rescued and treated for serious symptoms caused by eating fishing tackle.
How water moves through the broad, 25-mile stretch has big implications for cleaning up its algae problem.
Scientists briefly borrow baby eagles to study harmful substances.
A Wisconsin company is helping cheese factories reduce pollution while making electricity.
A hiker discovered a stream flowing into the St. Croix River was being polluted by sand which escaped from a mine near Grantsburg, Wisconsin.