Measuring nitrates in the Mississippi River basin, 1980 to 2008

  • Graphic by: RAYMOND GRUMNEY
  • Updated: August 10, 2011 - 7:43 PM

Measuring nitrates in the Mississippi River basin, 1980 to 2008 Water monitoring by the U.S. Geological Survey at Clinton, Iowa, found a huge increase in nitrates flowing into the Mississippi River from Minnesota and western Wisconsin.