The W. D. Mayo Lock and Dam (also known as: W. D. Mayo Lock and Dam 14) on the Arkansas River is an integral part of the McClellan-Kerr Arkansas River Navigation System (MKARNS).

It was named for a deceased Sallisaw, Oklahoma businessman who was also a civic leader and champion of fully developing the river.

[1] The number 14 designates this facility as the fourteenth in sequence from the start of MKARNS.

[3] Construction of the lock and dam began in May, 1966, and closure was completed on October 15, 1970.

[4] The surface area of the upper pool is 1,595 acres (6.45 km2) and the capacity is 15,800 acre-feet (19,500,000 m3).