The Great River Road is not a single road as its name might suggest. It is a collection of state, provincial, and local roads which follow the course of the Mississippi River through ten states of the United States: Arkansas, Illinois, Iowa, Kentucky, Louisiana, Minnesota, Mississippi, Missouri, Tennessee and Wisconsin. Developed in 1938, the road has a separate commission in each state. These in turn cooperate through the Mississippi River Parkway Commission (source: Wikipedia).
The 5-cent Great River Road commemorative postage stamp was issued on October 21, 1966, in Baton Rouge, Louisiana, headquarters of the Mississippi River Parkway Commission. The stamp's image suggests the central portion of the United States from the Canadian border to the Gulf of Mexico. The double-pointed red arrow indicates the route of the road, which is a white ribbon on either side of the Mississippi River.
This is a post for Sunday Stamps at Viridian's Postcard Blog