South Carolina Highway 121
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| Route information | ||||
| Maintained by SCDOT | ||||
| Length: | 134.1 mi (215.8 km) | |||
| Existed: | 1964 – present | |||
| Major junctions | ||||
| South end: |
      US 1 / US 25 / US 78 / US 278 / SR 10 / SR 121 at the GA state line near North Augusta
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 I-20 in North Augusta  US 178 / SC 39 in Saluda US 378 in Saluda US 76 in Newberry I-26 in Newberry US 176 near Whitmire  US 321 / SC 9 in Chester
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| North end: |
  US 21 / SC 322 in Rock Hill
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| Location | ||||
| Counties: | Aiken, Edgefield, Saluda, Newberry, Union, Chester, York | |||
| Highway system | ||||
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| Location: | Chester, South Carolina |
| Length: | 2.6 mi (4.2 km) |
| Existed: | 1964–N/A |
South Carolina Highway 121 (SC 121) is a major state highway that runs north and south in the western part of the U.S. state of South Carolina. The road is actually part of a long multi-state route that also goes through Florida and Georgia. Some see it as a de facto auxiliary route from U.S. Route 21 in Rock Hill. Efforts to have the road upgraded to such status have failed however.
South Carolina Highway 121 continues its concurrency with U.S. Route 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 at Exit 22 and Interstate 20 in South Carolina(at Exit 5).
In Trenton, US 25 turns left onto SC 19 and SC 121 becomes an independent route for the first time. From there 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.
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Wikipedia