The document discusses the US Inland Waterway System, specifically focusing on the Mississippi River. It notes that the Mississippi River runs over 2,300 miles from Minnesota to the Gulf of Mexico and is the 4th longest river in the world. When combined with its tributaries, the inland waterway system covers over 12,000 miles across 38 US states. Over 500 million tons of cargo are transported annually on this system. The Army Corps of Engineers is responsible for maintenance and modernization of the locks, channels, and infrastructure. Barges are highly efficient for moving bulk commodities like grain, coal, petroleum, and steel over long distances.