The 6-cent Arkansas River Navigation commemorative stamp was issued October 1, 1968, at Little Rock, Arkansas.
This stamp was in recognition of the economic potential of the $1.2 billion project, which was nearing completion. It eventually provided Arkansas, Kansas, and Oklahoma with a barge route to the Mississippi River and became one of the nation's major inland waterways.
The stamp was designed by Dean Ellis and was issued in panes of fifty, with an initial printing of 120 million.
Postal Bulletin (September 12, 1968).