[1] It connects to SH-112 at Rock Island on its western end and passes through Le Flore County to the Arkansas state line, where it becomes Highway 10 running to Little Rock.

[2] Highway 120 begins at SH-112 and heads due east.

The road curves to the south as it passes through an area of sandy terrain.

[citation needed] SH-112 first appears on the 1957 state highway map, implying that it was commissioned in 1956.

At that time, the entire length of the highway was gravel.