Interstate 77 in South Carolina

By | October 14, 2022


Get started columbia
End Rock Hills
Length 90 mi
Length 145 km
  • 1 → Greenville / Charleston2 12th Street Extension
  • 5 Bluff Road
  • 6 Shop Road
  • 9 Columbia
  • 10 Fort Jackson Boulevard
  • 12 Forest Drive
  • 13 Decker Boulevard
  • 15 Percival Road
  • 16 → Augusta / Florence
  • 17 Colombia
  • 18 → Colombia
  • 19 Farrow Road
  • 22 Killian
  • 24
  • 27 Blythewood
  • 32 Ridgeway
  • 34 Ridgeway
  • 41 Winnsboro
  • 46 Camp Welfare Road
  • 48 Great Falls
  • 55 Chester
  • 62 Richburg
  • 65 Chester
  • 73 Rock Hill
  • 75 Rock Hill
  • 77 Rock Hill
  • 79 Rock Hill
  • 82 Rock Hill
  • 83 Fort Mill
  • 85 Fort Mill
  • 88 Tega Cay
  • 90
  • North Carolina

Interstate 77 or I -77 is an Interstate Highway in the U.S. state of South Carolina. The highway forms a north-south route in the middle of the state and runs from the capital Columbia to the North Carolina border at Rock Hill. Interstate 77 is 145 kilometers long.

  • WATCHTUTORIALS.ORG: Features why South Carolina has the nickname as Palmetto State and its economy, history and geography.

Travel directions

I-77 at Rock Hill, near the North Carolina border.

I-77 at I-20 at Columbia.

Interstate 77 begins on the south side of the state capital Columbia at an interchange with Interstate 26. I-77 then forms the southern and eastern bypass of Columbia and bridges the Broad River. I-77 has 2×3 lanes and crosses Interstate 20 east of Columbia. Shortly thereafter, State Route 277 connects from downtown. I-77 then briefly has 2×4 lanes but quickly narrows back to 2×3 lanes.

This is followed by a rural route of approximately 90 kilometers to Rock Hill. Outside of the metropolitan area of ​​Columbia, the highway has 2×2 lanes and leads through a densely wooded area that is slightly sloping. I-77 passes the small town of Rock Hill on the east side, the passage past the town has 2×3 to 2×4 lanes. In fact, this is already part of the Charlotte urban area. I-77 holds 2×4 lanes to the border with North Carolina. Interstate 77 in North Carolina then continues through Charlotte.

  • Provides state overview of South Carolina and its alternative name as The Palmetto State


Before the construction of I-77, US 21 was the through route between Columbia, Rock Hill and Charlotte. This road was equipped with 2×2 lanes only in the metropolitan areas of Columbia and Rock Hill prior to the construction of I-77. At that time, through traffic was not that extensive because both Columbia and Charlotte only started to grow strongly a little later.

Construction history

The original 1957 Interstate Highways plan envisioned a southern end of I-77 in Charlotte, North Carolina, so it would not pass through South Carolina. In the Federal-Aid Highway Act of 1968, it was decided to extend I-77 further south to I-20 in Columbia. Construction first started on the northern section between Rock Hill and Charlotte, which opened in the mid-1970s. The longer stretch from Columbia to Rock Hill was opened in the late 1970s and early 1980s, and from 1982 the highway was continuous between Columbia and Charlotte.

Still later, it was decided to extend I-77 to I-26, as an eastern bypass of Columbia. This facilitated traffic from Charlotte to Charleston. In 1986, I-77 was extended several miles south of I-20 in Columbia. Also in 1986, the section south of Columbia opened with administrative number I-326. However, this number was probably never signposted. This section also included the bridge over the Broad River. In 1995, the last link opened along the east side of Columbia, completing I-77.

Later adjustments

In the 1990s, the section between State Highway 277 at Columbia and US 21 north of the city was widened to 2×3 lanes. Between 2016 and 2018, a short stretch between I-20 and State Highway 277 on the northeast side of Columbia was widened from 2×2 to 2×3 lanes.

Traffic intensities

Daily, 70,000 to 80,000 vehicles travel on I-77 along the south and east sides of Columbia, then drop to 55,000 vehicles between I-20 and SC-277. Shortly thereafter, a peak of 86,000 vehicles per day is immediately after SC-277, then rapidly declines to about 40,000 vehicles per day between Columbia and Rock Hill. This then rises again to 62,000 vehicles along Rock Hill and 145,000 vehicles on the border with the state of North Carolina, due to the area of ​​influence of the city of Charlotte.

Interstate 77 in South Carolina