South Carolina Highway 121 (SC 121) is a major state highway that travels north and south in central parts of the U.S. state of South Carolina. The highway is actually part of a long multi-state highway that also exists in Florida and Georgia, as Florida State Road 121 and Georgia State Route 121, respectively. Some see it as a de facto auxiliary route from U.S. Route 21 (US 21) in Rock Hill. Efforts to have the road upgraded to such status have failed however. Route description SC 121 continues its concurrency with U.S. Route 25 (US 25) from Augusta, Georgia into North Augusta, South Carolina. In the Schultz Hill section of North Augusta, US 25/SC 121 leaves the concurrency with US 1 and US 78, and heads north. Still within North Augusta, it has an interchange with Interstate 520 (I-520) at exit 22 and I-20 (at exit 5). In Trenton at the northern terminus of SC 19, US 25 turns to the north. From there the route becomes independent and it runs mainly through rural western South Carolina. Johnston is where the route serves as the northern terminus of SC 191 and later crosses SC 23. In Saluda, SC 121 is overlapped by US 178/SC 39, then intersects US 378. The overlap with US 178/SC 39 ends at Travis Road. Later it crosses a bridge over the Saluda River and is then overlapped with SC 34 until it reaches Newberry. Barely inside Newberry, the route becomes the terminus of SC 395 and then has a major intersection with US 76. Further north it encounters a quarter-cloverleaf interchanges with I-26 (at exit 72). North of Newberry, it encounters yet another concurrency with US 176, which it follows straight north before curving to the west as it enters Whitmire, where the routes make a sharp turn to the east and encounters the beginning of a long concurrency with SC 72. After a bridge over the Enoree River, the concurrency with US 176 ends just east of Whitmire. SC 121/72 runs through Carlisle where it has another concurrency with SC 215, which ends east of the bridge over the Broad River, which contains a monument to an American Revolutionary battle known as the Battle of Fishdam Ford. SC 121/72 does not encounter any major junctions for about 12 miles (19.3 km) until they reach Chester, where SC 121/72 has another concurrency, this time