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The Highways of South Carolina I-85 
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I-77
From: US 21US 176 ALTUS 321 Dixiana (Lexington County)
To: North Carolina State Line near Fort Mill (York County).
Nationally, I-77 runs Dixiana to I-90 Cleveland, OH.
Total Length: 91.4 miles  
ROUTE LOG
US 21, US 176, US 321: 0 - 0
EXIT 1 - I-26 (exit 116): 0.3 - 0.3
EXIT 2 - SC 35: 1.5 - 1.8
Richland-Lexington Line: 1.7 - 3.5
EXIT 5 - SC 48: 2.7 - 6.2
EXIT 6 - SC 768: 1 - 7.2
EXIT 9 - US 76, US 378, SC 262: 2.5 - 9.7
EXIT 10 - SC 760: 1.2 - 10.9
EXIT 12 - Forest Dr: 1.7 - 12.6
EXIT 13 - S-40-151: 1.5 - 14.1
EXIT 15 - SC 12: 1 - 15.1
EXIT 16 (old 1) - I-20 (exit 76): 1.2 - 16.3
EXIT 17 (old 2) - US 1: 1.5 - 17.8
EXIT 18 (old 3) - SC 277: 1.3 - 19.1
EXIT 19 (old 4) - SC 555: 0.3 - 19.4
EXIT 22 (old 6) - S-40-52: 2.4 - 21.8
EXIT 24 (old 8) - US 21: 2.7 - 24.5
EXIT 27 (old 11) - S-40-59: 3.2 - 27.7
Fairfield-Richland Line: 2.1 - 29.8
EXIT 34 (old 18) - SC 34: 4.5 - 34.3
EXIT 41 (old 25) - S-20-41: 6.8 - 41.1
EXIT 46 (old 30) - S-20-20: 4.7 - 45.8
EXIT 48 (old 32) - SC 200: 2.6 - 48.4
Chester-Fairfield Line: 2.8 - 51.2
EXIT 55 (old 39) - SC 97: 4.3 - 55.5
EXIT 62 (old 46) - S-12-56: 7.2 - 62.7
EXIT 65 (old 49) - SC 9: 2.3 - 65
York-Chester Line: 5.1 - 70.1
EXIT 73 (old 57) - SC 901: 2.8 - 72.9
EXIT 75 (old 59) - S-46-245: 2.6 - 75.5
EXIT 77 (old 61) - US 21, SC 5: 1.7 - 77.2
EXIT 79 (old 63) - SC 122: 2 - 79.2
EXIT 82 (old 66) - US 21, SC 161: 2.4 - 81.6
EXIT 83 (old 67) - S-46-49: 1.9 - 83.5
EXIT 85 (old 69) - SC 160: 2.1 - 85.6
EXIT 88 (old 72) - S-46-98: 2.4 - 88
EXIT 90 (old 74) - US 21 SB: 2.5 - 90.5
NC STATE LINE: 0.9 - 91.4
Creation: I-77 first appeared on SC Official Maps in 1971 or 1972, as dotted lines from NC down to US 21-SC 5. However, the 1970 map shows US 21 on the freeway entering South Carolina to today's Exit 90.
Adjustments:The 1973 Official Map shows dotted lines labeled I-77 around Rock Hill and also from SC 12 north to SC 34.
In 1974 or 1975, I-77 was opened from NC down to US 21-SC 161. Also, I-77 had dotted lines continuously from Rock Hill to Columbia.
In 1976, I-77 was opened down to US 21-SC 5.
In 1979, I-77 was opened from SC 277 to US 21.
In 1980 or 1981, I-77 was opened from US 21 to SC 34 and from SC 9 north to US 21-SC 5.
The 1982 Official Map shows I-77 completely open from US 1 north to North Carolina. However, I know from a trip to Carowinds around this time that the section between SC 97 and SC 9 opened first before the entire road was opened.
In 1987 or 1988, I-77 was opened from US 1 to SC 12.
Between 1994 and 1996, I-77 was opened as new construction from SC 12 around to US 76-378/SC 262, and assigned to the freeway from there to US 21-176-321, which was signed as TEMP SC 478 for a few years beforehand. This older freeway had been the proposed I-326. Official maps in the early 80's labeled the dotted lines north of US 76-378 as SC 77.
Improvements: 4 lane freeway at inception in Rock Hill area. IIRC, I-77 is 6-lanes in the Columbia area.
Comment: I-77 is the least developed of South Carolina interstates.
Numerous styles of overpass bridges exist on I-77, which for some reason fascinated me when I was in middle school.
I-77 received exit numbers in 1976, which were all renumbered in 1987 or 1988.
I-77 was not originally slated to be in South Carolina, but was extended to Rock Hill on paper in the late 60's and down to Columbia in the early 70's.
I-77 TEMP  not currently signed
Previous I-77 TEMP: I-77 TEMP: Once I-77 was slated to form the south and east sides of the Columbia Beltway, I-77 TEMP signs were erected on I-26 from TEMP SC 478 (which became I-77) to I-20, I-20 east from I-26 to SC 277, and on SC 277 from I-20 to I-77.
This designation is shown on official maps from 1987 or 1988 until I-77 was actually finished 1994-96.

Last Update: 26 October 2005

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