SH-2 then passes Robbers Cave State Park and the eastern edge of the Sansbois Mountains before reaching SH-31 east of Quinton, and the two form a six-mile (10 km) concurrency until Kinta.

Three miles (4.9 km) later, the highway passes the eastern terminus of SH-71, south of the town of Porum, Oklahoma.

However, the official definition of the highway contains an unsigned concurrency with US-59 to the point where it crosses the state line into Kansas.

Its builders during the 1930s and 1940s, in order to save the expense of building two bridges across the Kiamichi River, routed the highway mid-way up the flank of Bull Creek Mountain.

During the 1980s a new route was opened in the floor of the valley, featuring modern bridges across Pine Creek and the Kiamichi River.

[5] The section of SH-2 between I-40 and SH-9 was pressed into service as a detour for eastbound I-40 traffic after the collapse of its bridge over the Arkansas River on May 26, 2002.