, located on the east bank of the
Broad River 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 with
US 321/
SC 9. This concurrency runs southeast until US 321 branches off to the south at the southern terminus of
US 321 Business (US 321 Bus.). The routes continue to the east along
SC 97, running beneath a railroad bridge, and then turning toward the north. SC 9 makes a right turn at Lancaster Avenue, which is the eastern terminus of
SC 9 Bus. SC 121/72/97 has an at-grade crossing with another railroad line leading to the city, and then SC 121/72 branches off to the right at Saluda Road (
SC 72 Bus.), while SC 97 continues north. The concurrency with SC 72 finally ends at
SC 901 in Rock Hill. Within the city, it joins briefly with
SC 5, before merging with its final concurrency,
US 21. Traversing east of the downtown area, its journey ends at Cherry Road, where US 21 continues north towards
Fort Mill, while also connecting with
SC 322. SC 121 is one of the most concurrent state highways in South Carolina. It shares long stretches of pavement with these two routes: • US 25 from the Georgia state line to Trenton (20 miles) • SC 72 from Whitmire to Rock Hill (46 miles, as well as the longest concurrency in South Carolina) It has shorter concurrencies with US 1, 78, and 278 (altogether),
SC 230, US 178,
SC 39,
SC 34, US 176, SC 215, US 321, SC 9, SC 97,
SC 909, SC 5, and US 21. ==History==