The Minnesota Pollution Control Agency is placing 500 additional lakes and sections of rivers on its list of impaired waters. Minnesota now has more than 3,600 bodies of water on the list. MPR reports about 40 percent of the state's waters are considered to have an excess of nitrogen, phosphorus, mercury, bacteria or other pollutants. Hundreds of clean-up plans have been developed over the past two decades, but less than 20 bodies of water have come of the list.

The Weather Service reports the Red River of the North is falling in Grand Forks after Monday's crest just over 17 feet. That's below flood stage and a far cry from the 40 or so feet it reached in each of the last three years.

Some Minnesota rivers have been drained by drought, and some have dropped so low that state officials have suspended water pumping permits for dozens of businesses, including golf courses, nurseries and sod-growing operations, MPR reports.

According to the report by Environment Minnesota, about half of the toxic chemicals are dumped into the Mississippi River. The Blue Earth and Rainy rivers also rank high in industrial pollutants.

The fish is finding its way into a few new places, but it still hasn't turned up in Minnesota.