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List of Interstate Highways in South Carolina

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Interstate Highways of South Carolina
Interstate 26 marker
Interstate 385 marker
Interstate 20 Business marker
Highway shields for I-26, I-385, and I-20 Bus. Spur
Map
Interstate Highways highlighted in red; future sections in blue; unbuilt sections in orange
System information
Maintained by SCDOT
Length862.60 mi (1,388.22 km)
FormedJune 29, 1956 (1956-06-29)[1]
Highway names
InterstatesInterstate XX (I-XX)
Business Loop:Interstate XX Business Loop (I-XX Bus.)
Business Spur:Interstate XX Business Spur (I-XX Bus.)
System links

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

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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 designation along SC 22
I-74 — — Future I-74 at the NC state line US 17 in Garden City proposed — Future designation 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

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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 7.72 12.42 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

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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
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-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 —
I-385 BS 0.490 0.789 I-385 / US 276 in Greenville US 29 / SC 183 in Greenville 01962-01-011962 current Unsigned 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
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 —
  •       Former

See also

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References

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  1. ^ Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. Vol. 60, no. 1. Washington, DC: Federal Highway Administration. ISSN 0033-3735. Retrieved March 16, 2012.
  2. ^ Starks, Edward (January 27, 2022). "Table 3: Interstate Routes in Each of the 50 States, District of Columbia, and Puerto Rico". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved January 23, 2023.
  3. ^ Starks, Edward (January 27, 2022). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2021". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved January 23, 2023.
  4. ^ Starks, Edward (January 27, 2022). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2021". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved January 23, 2023.
  5. ^ Special Committee on U.S. Route Numbering (April 23, 1995). "Report of the Special Committee on U.S. Route Numbering to the Standing Committee on Highways" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived from the original (PDF) on October 16, 2017. Retrieved May 19, 2013.
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