State Route 313 (SR 313) is a secondary state highway mostly in Bradley County but also in Polk County.

Although it is signed as an east-west highway, it actually runs diagonally on a northwest-southeast axis.

SR 313 is known as Ladd Springs Road its entire length.

It begins at an intersection with US 411 (SR 33) in southeastern Polk County in the unincorporated community of Old Fort.

SR 313 continues for several miles through a rural and mostly agricultural area before reaching its terminus with SR 74 in the census designated place of Wildwood Lake.