 SR 156 begins in Franklin County atop the western part of the Cumberland Plateau near Sewanee at an intersection with U.S. Route 41A/Tennessee State Route 15/SR 56.It winds its way southeastward across a remote section of the plateau, passing through Franklin State Forest along the way and crossing into Marion County after straddling the county line for a few miles.After exiting the forest, the road veers eastward and intersects Orme Mountain Road, a gravel road connecting the highway with Orme in the valley to the south.