The report, Inland Harbors: The Corps of Engineers Should Assess Existing Capabilities to Better Inform Dredging Decisions, reviewed the ports from 2010 through 2015. These ports primarily moved a mix of agricultural commodities (corn, soybeans, and rice), petroleum products, and crude materials (such as sand and gravel, among others). However, the ports varied, with some primarily moving grain, and others moving a variety of commodities. These ports also varied in tonnage transported, ranging from less than one million tons annually to more than 10 million tons per year.
The full story is available here: https://www.workboat.com/news/coastal-inland-waterways/gao-report-looks-at-dredging-at-lower-mississippi-river-ports/