South Carolina Highway 421

South Carolina Highway 421 (SC 421) is a 10.360-mile (16.673 km) state highway in the U.S. state of South Carolina. It is an alternate route to U.S. Route 1 (US 1) and US 78 between North Augusta and Aiken.

South Carolina Highway 421 marker

South Carolina Highway 421

Augusta Road
Route information
Maintained by SCDOT
Length10.360 mi[1] (16.673 km)
Existed1952–present
Major junctions
South end US 1 / US 78 / US 278 / SC 125 southwest of Clearwater
North end US 1 / US 78 in Aiken
Location
CountryUnited States
StateSouth Carolina
CountiesAiken
Highway system
← SC 420→ SC 430

Route description

SC 421 begins where it splits off from US 1/US 78 (Jefferson Davis Highway) southwest of Clearwater; it immediately connects with US 278/SC 125 (Atomic Road). Heading northeast, it parallels US 1/US 78 to its south, going through the towns of Clearwater, Burnettown, Langley, Gloverville and Warrenville. Upon entering Aiken, it reconnects with US 1/US 78. A majority of the highway is four-lanes that travels a total of 10.4 miles (16.7 km).[2]

History

SC 421 was established by 1952 as a renumbering of US 1/US 78, which was realigned onto new four-lane routing just north of it. The route has remained unchanged since inception.[3][4]

Major intersections

The entire route is in Aiken County.

Locationmi[1]kmDestinationsNotes
​0.0000.000

 US 1 north / US 78 east (Jefferson Davis Highway) – Aiken		Northbound lane only; southern terminus
Clearwater0.2300.370 US 278 / SC 125 (Atomic Road) – North Augusta, Augusta, Beech Island, Savannah River SiteNorthern end of US 278 concurrency (northbound lane only); southbound lane exit onto interchange
1.9103.074
 SC 126 west (Belvedere-Clearwater Road) – Belvedere		Eastern terminus of SC 126
Warrenville8.15013.116
 SC 191 north (Old Graniteville Highway) – Graniteville, Vaucluse		Southern terminus of SC 191
Aiken10.03016.142 SC 118 (Hitchcock Parkway / SC 19 Truck)
10.36016.673 US 1 / US 78 (Jefferson Davis Highway) – AikenNorthern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also

References
  1. "Highway Logmile Report". South Carolina Department of Transportation. Retrieved November 11, 2020.
  2. South Carolina Highway 421 (Map). Cartography by Google. Google Maps. 2010.
  3. General Highway Map, Aiken County, South Carolina (PDF) (Map). Cartography by SCDOT. South Carolina Department of Transportation. 1940. Retrieved September 8, 2013.
  4. General Highway Map, Aiken County, South Carolina (PDF) (Map). Cartography by SCDOT. South Carolina Department of Transportation. 1956. Retrieved September 8, 2013.
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