 At the head of the McClellan @-@ Kerr Arkansas River Navigation System , the Tulsa Port of Catoosa is the most inland ocean @-@ going port in the United States and connects barge traffic from Tulsa to the Mississippi River via the Verdigris and Arkansas rivers . The facility is one of the largest <unk> in the United States and contributes to one of the busiest waterways in the world via its course to the Gulf of Mexico . 
