20230420 11073900 1.0 TRUE NCDOT Strategic Ports The ports are politically defined by port limits or Corps projects, excluding non-Corps projects not authorized for publication. The determination for the published Principal Ports is based upon the total tonnage for the port for the particular year; therefore the top 150 list can vary from year to year. US Army Corps of Engineers (USACE) at http://www.iwr.usace.army.mil/About/TechnicalCenters/WCSCWaterborneCommerceStatisticsCenter.aspx U.S. Army Corps of Engineers, Navigation Data Center, Waterborne Commerce Statistics Center, New Orleans, LA.