US 78 highlighted in red
|Maintained by SCDOT|
|Length||141.0 mi (226.9 km)|
|West end||US 1 / US 25 / US 78 / US 278 / SR 10 / SR 121 at the Georgia line near North Augusta|
|East end||Line Street / King Street in Charleston|
|Counties||Aiken, Barnwell, Bamberg, Orangeburg, Dorchester, Charleston|
U.S. Route 78 (US 78) is a U.S. highway that travels from Memphis, Tennessee to Charleston, South Carolina. In the U.S. state of South Carolina, it runs from the Savannah River at North Augusta to its eastern terminus in Charleston; connecting the cities of Aiken, Summerville, and North Charleston.
US 78 enters South Carolina by crossing the Savannah River in North Augusta; sharing concurrences with US 1, US 25, US 278 and SC 121. In the immediate 2-mile (3.2 km) area, it sheds most concurrences, sharing only with US 1 towards Aiken; it also connects with I-520, which is a partial beltway around the Augusta metropolitan area. In Aiken, it travels through the downtown area, where US 1 splits north towards Columbia. West of Williston is SC 781, which connects back with US 278; the routing allows travelers to bypass Aiken all together between Williston and Augusta.
Traveling in a southeasterly direction, it goes through the cities and towns of Williston, Blackville, Denmark, Bamberg, Branchville and St. George, where connects with I-95. Continuing east, it passes through Dorchester and begins to parallel with I-26 in a southeasterly direction through Summerville. It crosses into Charleston County at Lincolnville, where the highway skirts just inches south of the Berkeley County line. In North Charleston, US 78 shares a concurrency with US 52, as it connects with I-526. Entering Charleston, it splits with US 52 and goes south along King Street; its eastern terminus at Line Street, a block away from US 52's eastern/southern terminus and nearby to I-26/US 17 interchange.
US 78 is a predominantly two-lane rural highway connecting much of the Lowcountry. Wider sections (four-lanes or more) are found between North Augusta-Aiken, St. George and North Charleston. Though it provides the most direct route between Augusta and Charleston (using US 278/SC 781 to bypass Aiken), it is not a busy route because of the many cities and towns it goes through.
Established in 1927 as an original US highway, it traveled closely as it does today; from North Augusta to Charleston, connecting the cities and towns of Aiken, Bamberg, St. George, and North Charleston.
By 1931, US 78 was rerouted north of Summerville and Lincolnville, leaving Richardson Avenue/Lincoln Avenue. Around 1939, US 78 was realigned from Meeting Street to Rivers Street, south of Durant Avenue in the Charleston area. Also in 1939, US 78 was fully paved in the state, its last unpaved section was between St. George and US 178. By 1952, US 78 was placed on new four-lane highway bypassing Clearwater, Burnettown, and Gloverville; also by same year a new bridge was constructed over the Savannah River, leaving Fifth Street Bridge. By 1967, US 78 was adjusted to bypass south of mainstreet Blackville, leaving a secondary road, but was later upgraded as a connector (signed as a business loop).
This section contains a table that is missing mileposts for one or more junctions.
|Aiken||North Augusta||0.0||0.0||US 1 south / US 25 south / US 78 west / US 278 west / SR 10 west / SR 121 south (Gordon Highway) – Augusta||Continuation from Georgia over the Savannah River|
|0.2||0.32||5th Street Bridge / River North Drive||Interchange|
|0.7||1.1||US 25 north / SC 121 north – North Augusta, Edgefield||North end of US 25/SC 121 concurrency|
|East Buena Vista Avenue west (SC 125 Conn. north)||Southern terminus of SC 125 Conn.; no access from Jefferson Davis Highway northbound to SC 125 Conn. or vice versa|
|1.4||2.3||I-520 (Palmetto Parkway) – Augusta, Columbia, Atlanta||I-520 exit 17|
|Clearwater||2.3||3.7||US 278 east / SC 125 (Atomic Road) / SC 421 north (Augusta Road) – Beech Island, Savannah River Site, Clearwater||East end of US 278 concurrency; southern terminus of SC 421|
|Burnettown||4.0||6.4||SC 126 (Belvedere–Clearwater Road) – Belvedere|
|Graniteville||10.2||16.4||SC 191 (Main Street) – Graniteville, Vaucluse, Warrenville|
|Aiken||12.2||19.6||SC 118 (Robert M Bell Parkway / Hitchcock Parkway) to I-20 / SC 302||Southern terminus of US 1 Truck; western terminus of US 78 Truck; to USC Aiken|
|12.4||20.0||SC 421 south (Augusta Road)||Northern terminus of SC 421|
|15.5||24.9||SC 19 (Laurens Street) – Eureka, Edgefield|
SC 19 Conn. (Chesterfield Street) – Savannah River Site
|Signed also as SC 19|
|15.8||25.4||US 1 north (York Street NE)||North end of US 1 concurrency|
|||18.1||29.1||SC 4 east (Wagener Road) to SC 302||Western terminus of SC 4|
|||18.4||29.6||SC 118 / SC 302 (East Pine Log Road) to I-20||Eastern terminus of US 78 Truck|
|||34.2||55.0||SC 781 west (Tinker Creek Road)||Eastern terminus of SC 781|
|Barnwell||Williston||37.2||59.9||SC 39 south (Rosemary Street/Dunbarton Road)||South end of SC 39 concurrency|
|37.5||60.4||SC 39 north (Elko Street/Springfield Road) – Springfield||North end of SC 39 concurrency|
|Elko||40.3||64.9||SC 37 (Bay Street) – Barnwell, Springfield|
US 78 Bus. east (Walker Street)
|Western terminus of US 78 Bus.|
|46.8||75.3||SC 3 (Solomon Blatt Avenue) – Barnwell|
|46.9||75.5||SC 304 south (Lartigue Street) – Hilda||Northern terminus of SC 304|
US 78 Bus. west (Main Street)
|Eastern terminus of US 78 Bus.|
|Bamberg||Denmark||54.9||88.4||US 321 / SC 70 (Palmetto Avenue) – Orangeburg, Barnwell|
|Bamberg||61.5||99.0||US 301 / US 601 – Orangeburg, Allendale, Ehrhardt|
|||71.3||114.7||SC 61 south (Edisto River Road)||Northern terminus of SC 61|
|Orangeburg||Branchville||75.8||122.0||US 21 south (Freedom Road) – Smoaks, Walterboro, Savannah||South end of US 21 concurrency|
|76.0||122.3||US 21 north (Freedom Road) – Orangeburg, Columbia||North end of US 21 concurrency|
|Dorchester||St. George||88.8||142.9||I-95 – Savannah, Florence||I-95 exit 77|
|90.9||146.3||US 15 (Parler Avenue) – Walterboro, Santee|
|||104.7||168.5||US 178 west (East Main Street) – Harleyville||Eastern terminus of US 178|
|||107.5||173.0||SC 27 north (Ridgeville Road) – Holly Hill||West end of SC 27 concurrency|
|||107.9||173.6||SC 27 south (Ridgeville Road) – Ridgeville||East end of SC 27 concurrency|
US 17 Alt. (North Main Street) – Walterboro, Moncks Corner
|118.7||191.0||SC 165 (Berlin G. Myers Parkway / US 17 Alt. Truck) – Ravenel|
|Charleston||North Charleston||124.7||200.7||I-26 – Columbia, Charleston||I-26 exit 205|
|126.8||204.1||US 52 west – Goose Creek, Moncks Corner||West end of US 52 concurrency; interchange|
|128.2||206.3||I-26 east – Charleston||I-26 exit 209A; no access to I-26 west|
|132.7||213.6||I-526 (Mark Clark Expressway) – Savannah, Mount Pleasant||I-526 exit 18|
|135.7||218.4||SC 642 west (Dorchester Road)||Eastern terminus of SC 642|
|135.9||218.7||SC 7 south (Cosgrove Avenue)||Northern terminus of SC 7|
|136.4||219.5||US 52 east (Carner Avenue)||East end of US 52 concurrency|
|Charleston||141.0||226.9||Line Street to US 17 north||No access from US 78 (King Street) or Line Street eastbound to westbound Line Street; eastern terminus|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
- Google (May 23, 2013). "Route of US 78 in South Carolina" (Map). Google Maps. Google. Retrieved May 23, 2013.
- General Highway Map, Barnwell County, South Carolina (PDF) (Map). Cartography by SCDOT. South Carolina Department of Transportation. 1967. Retrieved April 11, 2014.
- General Highway Map, Barnwell County, South Carolina (PDF) (Map). Cartography by SCDOT. South Carolina Department of Transportation. 1987. Retrieved April 11, 2014.
- Aiken & North Augusta Urban Area (PDF) (Map). South Carolina Department of Transportation. August 2019. p. Sheet 6. Retrieved September 12, 2020.
- Media related to U.S. Route 78 in South Carolina at Wikimedia Commons
- End of US highway 78 on USends.com
- Mapmikey's South Carolina Highways Page: US 78
|U.S. Route 78|
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