There are 11 Interstate Highways—5 primary and 6 auxiliary—that exist entirely or partially in the U.S. state of South Carolina. As of December 31, 2013, the state had a total of 850.80 miles (1,369.23 km) of interstate and 11.80 miles (18.99 km) of interstate business, all maintained by the South Carolina Department of Transportation (SCDOT).[2]

Primary Interstates

Number Length (mi)[3] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-20 141.51 227.74 I-20 at the GA state line I-95 / I-20 Bus. in Florence 01964-01-011964 current
I-26 220.95 355.58 I-26 at the NC state line US 17 in Charleston 01960-01-011960 current
I-73 US 17 in Briarcliffe Acres Future I-73 at the NC state line proposed Future designated along SC 22.
I-74 Future I-74 at the NC state line US 17 in Garden City proposed Future designated along SC 31.
I-77 91.05 146.53 I-26 in Cayce I-77 / US 21 at the NC state line 01975-01-011975 current
I-85 106.28 171.04 I-85 at the GA state line I-85 at the NC state line 01959-01-011959 current
I-95 198.76 319.87 I-95 at the GA state line I-95 at the NC state line 01968-01-011968 current
  •       Proposed and unbuilt

Auxiliary Interstates

Number Length (mi)[4] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-126 3.680 5.922 I-26 / US 76 in Columbia US 21 / US 76 / US 176 / US 321 in Columbia 01961-01-011961 current
I-185 17.7 28.5 I-385 in Mauldin US 29 in Greenville 01961-01-011961 current Toll road between I-385 and I-85.
I-326 5.24 8.43 I-26 in Cayce SC 48 in Columbia 01976-01-011976 01995-01-011995[5] Was an unsigned designated route, replaced by I-77.
I-385 42.16 67.85 I-26 near Clinton US 276 in Greenville 01962-01-011962 current
I-520 7.20 11.59 I-520 at the GA state line I-20 in North Augusta 02004-01-012004 current
I-526 19.26 31.00 US 17 / SC 7 in Charleston I-526 Bus. / US 17 in Mount Pleasant 01989-01-011989 current
I-585 2.25 3.62 US 176 / US 221 / SC 9 in Spartanburg I-85 Bus. / US 176 near Spartanburg 01959-01-011959 current
  •       Former

Business Routes

Number Length (mi) Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-20 BS 2.110 3.396 I-20 / I-95 in Florence US 76 Conn. / West Evans Street in Florence 01970-01-011970 current Boulevard-grade business spur
I-85 BL 8.770 14.114 I-85 northwest of Fairforest I-85 east of Valley Falls 01995-01-011995 current Freeway-grade business loop
I-95 BL 5.7 9.2 I-95 near Walterboro I-95 near Walterboro proposed Proposed boulevard grade business loop.
I-126 BS 0.60 0.97 I-126 / US 21 / US 76 / US 176 / US 321 in Columbia US 21 / US 76 / US 176 / US 321 in Columbia 01980-01-011980 Was a boulevard grade business spur.
I-385 BS 0.490 0.789 I-385 / US 276 in Greenville US 29 / SC 183 in Greenville 01962-01-011962 current Unsigned boulevard-grade business spur
I-526 BS 1.570 2.527 I-526 / US 17 in Mount Pleasant SC 703 in Mount Pleasant 01992-01-011992 current Boulevard-grade business spur
I-585 BS 1.60 2.57 US 29 / US 176 / SC 9 in Spartanburg I-585 / US 176 / US 221 / SC 9 in Spartanburg 01959-01-011959 Was a boulevard grade business spur.
  •       Former
  •       Proposed and unbuilt

See also

References

  1. ^ Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. Washington, DC: Federal Highway Administration. 60 (1). ISSN 0033-3735. Retrieved March 16, 2012.
  2. ^ "Federal Highway Administration (FHWA) Route Log and Finder List: Table 3 - Interstate Routes". FHWA. Retrieved March 10, 2014.
  3. ^ "Federal Highway Administration (FHWA) Route Log and Finder List: Table 1 - Main Routes". FHWA. Retrieved March 10, 2014.
  4. ^ "Federal Highway Administration (FHWA) Route Log and Finder List: Table 2 - Auxiliary Routes". FHWA. Retrieved March 10, 2014.
  5. ^ "AASHTO Route Numbering Committee Agenda (1995-04-22)" (PDF). North Carolina Department of Transportation. July 28, 1995. Retrieved May 19, 2013.