Texas State Highway 315

SH 315 begins at a junction with US 259 in Mount Enterprise.[2] The route travels to the northeast through eastern Rusk County, intersecting FM 95 and FM 840.[3] Continuing to the northeast, the highway enters Panola County, in which it has junctions with FM 348, FM 1971, and FM 1970 in the community of Clayton. SH 315 then enters Carthage, where it intersects SH 149. The route travels through the western portion of Carthage before reaching its eastern terminus at Bus. US 79.[4]

A very similar route was originally designated as SH 215 in 1935. This route was not built, and was removed from the state highway system by 1939. SH 315 was designated on April 1, 1939 on its current route.[5] When originally constructed, the route between Mount Enterprise and the former community of Shiloh, approximately 5.8 miles to the east, was the first road in the state's Farm to Market system.[6][7] This route became part of SH 315 during the 1939 redescription of the state highway system.[1]