A portion of the route between Watkins Corner and Lambrook is designated as part of the Great River Road National Scenic Byway.

All routes are maintained by the Arkansas State Highway and Transportation Department (AHTD).

[a 1] After this short eastbound concurrency, Highway 318 continues due south again, now concurrent with the Great River Road, as a section line road, bridging Big Creek and crossing two levees before a junction with Highway 20 near Lambrook, where the route terminates.

[1] A new section was created near Watkins Corner south to a county road on June 28, 1973, pursuant to Act 9 of 1973 by the Arkansas General Assembly.

[10] The temporary structure was replaced with a permanent precast concrete bridge later that year.

[12] Following construction of a US 49 bypass of Helena, including a partial replacement of Highway 318 by new US 49, the route was decommissioned on June 24, 1970.