South Carolina Highway 45
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| Route information | ||||
| Maintained by SCDOT | ||||
| Length: | 75.3 mi (121.2 km) | |||
| Existed: | 1922 – present | |||
| Major junctions | ||||
| South end: |
 US 17 in McClellanville
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 US 17 Alt. in Jamestown US 52 in St. Stephen
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| North end: |
  US 15 / US 176 in Wells
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| Location | ||||
| Counties: | Charleston, Berkeley, Orangeburg | |||
| Highway system | ||||
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South Carolina Highway 45 (SC 45) is a primary state highway in the U.S. state of South Carolina. It serves as the main thoroughfare in northern Berkeley County.
Established as an original state highway (1922), it traversed from SC 41, in St. Stephen, to SC 31, in St. Matthews. Around 1926, SC 45 was truncated 4 miles (6.4 km) west of St. Stephen along a new alignment of SC 41 (current US 52). By 1931, SC 45 was extended west on new primary routing to SC 24, in Pelion. In 1937 or 1938, SC 45 was extended along US 52 east to St. Stephen, then east on new primary routing to SC 179 (current US 17 Alt), near Jamestown; this was SC 45's longest routing at over 105 miles (169 km).
In 1939, SC 45 was rerouted onto new primary routing west of Eutawville to its current northern terminus with US 15/SC 31, in Wells. Eutawville west to Swansea became part of SC 6; Swansea to Pelion became SC 69.
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