The U.S. Army Corps of Engineers St. Louis District offers the public two opportunities to tour the largest diesel towboat operating on the Mississippi River. Tours are offered to the public at no cost. Public open houses aboard the Motor Vessel MISSISSIPPI will take place: Friday, Aug. 14 from 6 p.m. - 8 p.m. along the riverfront in Cape Girardeau, Mo. and Saturday, Aug. 15 from 8 a.m. - 11 a.m. along the riverfront in Cape Girardeau, Mo.