Indiana Harbor Dredging Contractors Kokosing Construction Co. and O’Brien & Gere and the U.S. Army Corps of Engineers will present the 2013 Indiana Harbor dredging activities and schedule at a public meeting April 3, 2013. Over a period of eight to 10 years, this project will produce an estimated 1.8 million cubic yards of dredged materials. IHC is one of the busiest ports by tonnage and the number one area of contamination in the Great Lakes.