Tennessee State Route 131 is an east-west highway in Northern Grainger County. It runs from the Union/Grainger County Line, near Powder Springs, to the Grainger/Hancock County Line, west of Treadway. TN St Rt 131 passes through the following towns in Grainger County. Powder Springs Washburn Thorn Hill TN St Rt 131 is multi-plexed in Grainger County. U.S. Rt. 25E, at Thorn Hill. Tennessee State Route 32, at Thorn Hill. TN St Rt 131 intersects the following highways in Grainger County. U.S. Rt. 25E, at Thorn Hill. Tennessee State Route 32, at Thorn Hill. U.S. Rt. 25E, at Thorn Hill.
