# South Carolina Highway 18

South Carolina Highway 18 (SC 18) is a 39.040-mile (62.829 km) primary state highway in the U.S. state of South Carolina. It serves to connect the cities of Union, Gaffney and Shelby, North Carolina.

## Route description

SC 18 is a 39.0-mile (62.8 km) two-lane rural highway. In Gaffney, it goes through the downtown area along Fredrick Street and overlaps with the Overmountain Victory National Historic Trail.
SC 18 follows the former alignment of US 176 between Jonesville and Union. US 176 bypasses Jonesville and Union along a four lane highway to the west.

## History

SC 18 was established in 1938 as a renumbering of SC 111, from U.S. Route 29 (US 29) in Gaffney, to the North Carolina state line. In 1940, SC 18 was extended south along new primary routing to SC 9 in Pacolet. In 1942, it was extended again along new primary routing to SC 56 south of Glenn Springs. In 1960-1961, SC 18 was rerouted at Gaffney to US 176/SC 9 in Jonesville, replacing part of SC 11; its old alignment became part of SC 150. In 1989, SC 18 was extended to its current western terminus at US 176/SC 215, replacing part of US 176 and all of US 176 Bus.

### South Carolina Highway 18 (1922–1938)

The first SC 18 was an original state highway, established in 1922 between SC 20 in Abbeville northwest to Anderson and then northwest to SC 17 in Westminster. The next year, it was extended north-northeast to SC 2 in Walhalla. Two or three years later, its Westminster–Walhalla segment was eliminated, and it was routed from Westminster to the Georgia state line northwest of Long Creek. Its former path was redesignated as SC 183. In 1933, its western terminus was truncated to Westminster, to an intersection with US 76 and SC 13. Its former path was redesignated as part of US 76. In 1938, SC 18 was redesignated as part of SC 28 from Abbeville to Anderson and SC 24 from Anderson to Westminster.

#### Antreville alternate route

South Carolina Highway 18 Alternate (SC 18 Alt.) was an alternate route that existed in Antreville. It was established in November 1936 between SC 184 and SC 18 (now SC 28). In 1938, it was decommissioned and redesignated as SC 28 Alt. Today, it is a secondary road.

## Major intersections

| County | Location | mi | km | Destinations | Notes |
| Union | Union | 0.000 | 0.000 | SC 215 south – Chester US 176 east – Whitmire, Newberry, Columbia US 176 west / SC 18 Truck north / SC 215 north (Duncan Bypass) – Spartanburg, Gaffney, Airport | Western terminus of SC 18; southern terminus of SC 18 Truck; Duncan Bypass provides access to Union Medical Center |
| Union | Union | 0.070 | 0.113 | South Pinckney Street south (SC 215 Conn. south) | Northern terminus of SC 215 Conn.; SC 215 and SC 215 Conn. share the South Pinckney Street name. |
| Union | Union | 0.570 | 0.917 | Union Boulevard (SC 496 west) | Eastern terminus of SC 496 |
| Union | Union | 1.750 | 2.816 | SC 49 (Arthur Boulevard) – Union, Laurens | |
| Union | Union | 2.400 | 3.862 | Harwood Heights west (SC 18 Conn. west) – Buffalo | Eastern terminus of SC 18 Conn. and Harwood Heights |
| Union | Union | 3.110 | 5.005 | SC 18 Truck south (Connector Road / US 176 Conn. west) to US 176 – Whitmire, Rose Hill Plantation State Historic Site | Eastern terminus of US 176 Conn.; northern terminus of SC 18 Truck; provides access to Union Medical Center and Union County Airport |
| Union | ​ | 7.020 | 11.298 | SC 114 north (Bob Little Road) – Gaffney | Southern terminus of SC 114 |
| Union | ​ | 9.500 | 15.289 | SC 9 south (Jonesville Highway) – Chester | Western end of SC 9 concurrency |
| Union | Jonesville | 10.560 | 16.995 | SC 9 north (Main Street) – Spartanburg | Eastern end of SC 9 concurrency |
| Union | Jonesville | 10.980 | 17.671 | Church Street west (SC 9 Conn. south) | Northern terminus of SC 9 Conn.; eastern terminus of Church Street |
| Union | ​ | 14.570 | 23.448 | SC 114 south (Bobby Faucette Road) – Union | Northern terminus of SC 114 |
| Cherokee | ​ | 18.090 | 29.113 | SC 211 east (Gowdeysville Road) – Hickory Grove, York | Western end of SC 211 concurrency |
| Cherokee | Asbury | 18.790 | 30.240 | SC 211 west (Asbury Road) | Eastern end of SC 211 concurrency |
| Cherokee | Gaffney | 28.740 | 46.253 | SC 105 south (Wilkinsville Highway) – Hickory Grove | Western end of SC 105 concurrency |
| Cherokee | Gaffney | 29.060 | 46.768 | SC 105 north (Union Street) | Eastern end of SC 105 concurrency |
| Cherokee | Gaffney | 30.220 | 48.634 | SC 150 (Limestone Street) / SC 11 begins | Western end of SC 11 concurrency |
| Cherokee | Gaffney | 30.410 | 48.940 | US 29 (Granard Street) – Shelby, Gastonia, Spartanburg, Greenville | |
| Cherokee | Gaffney | 30.580 | 49.214 | SC 11 south (West Fredrick Street) – Chesnee, Spartanburg | Eastern end of SC 11 concurrency |
| Cherokee | Gaffney | 30.650 | 49.326 | SC 150 (Holland Street south / Providence Road north) | |
| Cherokee | ​ | 32.500 | 52.304 | Pleasant School Road to I-85 south – Spartanburg | |
| Cherokee | ​ | 33.820 | 54.428 | SC 329 south (Victory Trail Road) – Blacksburg | Northern terminus of SC 329 |
| Cherokee | ​ | 33.880– 34.007 | 54.525– 54.729 | I-85 / Wilcox Avenue – Spartanburg, Charlotte | I-85 exit 96; access to I-85 south is via Wilcox Avenue. |
| Cherokee | ​ | 39.040 | 62.829 | NC 18 north – Shelby | Continuation beyond North Carolina state line |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus ||||||

## Special routes
### Union truck route

South Carolina Highway 18 Truck (SC 18 Truck) is a 3.980 miles (6.405 km) truck route that travels along Duncan Bypass, in concurrency with US 176/SC 215, then reconnects with SC 18 at Connector Road.

### Union connector route

South Carolina Highway 18 Connector (SC 18 Conn) is a 0.520-mile (0.837 km) hidden designation between SC 18 and U.S. Route 176 (US 176)/SC 215, via Harwood Heights. It serves as a direct route to Buffalo from downtown Union.

### Gaffney connector route

South Carolina Highway 18 Connector (SC 18 Conn.) is the hidden designation of Logan Street, between SC 18 and U.S. Route 29 (US 29). However, this route is signed as mainline SC 18 throughout, despite county and state maps indicating its official routing is along Limestone Street.

### Gaffney alternate route 1

South Carolina Highway 18 Alternate (SC 18 Alt.) was an alternate route in Gaffney. It was established in 1938 as a redesignation of SC 111 Alt. between U.S. Route 29 (US 29) and SC 18. In 1940, it was decommissioned and became part of the mainline route.

### Gaffney alternate route 2

South Carolina Highway 18 Alternate (SC 18 Alt.) was an alternate route in Gaffney. It was established in 1940 as a redesignation of the SC 18 mainline between Limestone Street and U.S. Route 29 (US 29). In 1947, it was decommissioned and became part of SC 18 Conn. Today, it is part of SC 18 again.