Headed down the Arkansas, a barge locks through at the Ozark-Jetta Taylor Lock and Dam. Located at mile 308 of the river, the Ozark lock and dam is just one unit of the McClellan-Kerr Arkansas River Navigation System (MKARNS) that originates at the Port of Catoosa in Tulsa, Oklahoma. Running southeast through Oklahoma and Arkansas to the Mississippi River, the MKARNS ensures a 9-foot navigable channel for commercial barge traffic. The MKARNS is a "high-use" waterway system that routinely sees more than 10 million tons of traffic a year.