Researchers find tiny pieces of plastic in the water from Seeley to Prescott.
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.