Five gross things we used to dump in the Mississippi River -- and what we're dumping now

Steve Lee, a history buff and retired pollution regulator with the MPCA
Steve Lee, a history buff and retired pollution regulator with the Minnesota Pollution Control Agency, stops near the University of Minnesota steam plant, southeast of St. Anthony Falls in Minneapolis. Lee led a historical tour along the Mississippi River in Minneapolis on Wednesday, Nov. 14, 2018, for students and others interested in the pollution history of the river.