Interstate 26 (I-26): Kingsport to Charleston, Length and Crash Data

How long is I-26?

The FHWA Route Log puts I-26 at 328.04 miles. South Carolina has 220.90 of them, Tennessee 54.45 and North Carolina 52.69. Wikipedia's total is 328.09, and the whole 0.05-mile difference sits in South Carolina, where it lists 220.95.

Some pages quote a much shorter road. Interstate Guide's headline figure is 304.64 even though the three state lengths on the same page add up to about 328. The Route Log has no overlap note for I-26, and its North Carolina row matches the end-to-end figure, so the roughly 4 miles I-26 shares with I-240 in West Asheville appear to be counted on I-26. Crash rates on this page use those same three Route Log rows.

Where I-26 starts and ends

The northwest end is the junction of US 11W and US 23 in Kingsport, Tennessee. The southeast end is US 17 just north of downtown Charleston. US 23 rides along with I-26 through all of Tennessee, where the road is named the James H. Quillen Parkway. In North Carolina, US 19 and US 23 run with it from northeast of Mars Hill to just south of Forks of Ivy.

Heading south from Kingsport, I-26 passes Johnson City, tops out at Sams Gap (3,760 feet, its highest point), and reaches Asheville by way of Mars Hill. Signs between Mars Hill and Asheville still read "FUTURE I-26" because that older US 23 freeway falls short of some Interstate standards. Between Asheville and the South Carolina line it crosses the Eastern Continental Divide at 2,130 feet and descends past Hendersonville, Flat Rock and Saluda, with a 6 percent grade for about three miles at Howard Gap. In South Carolina it runs past Spartanburg to Columbia, then southeast across the Lowcountry to North Charleston and Charleston. South Carolina uses it as a hurricane evacuation route and can reverse lanes between I-526 and I-77, which it did for Hurricane Florence in September 2018.

Interstate junctions along I-26

Going south from Kingsport, I-26 meets I-81 between Kingsport and Johnson City, then I-40 in Asheville, where it originally ended. After that it meets I-85 near Spartanburg, I-20 at the Columbia cloverleaf known as Malfunction Junction, I-77 on Columbia's south side and I-95 near Orangeburg. Four of the six crossings are in South Carolina. Spurs and loops such as I-126, I-240, I-385 and I-526 are left off this list.

Fatal crashes on I-26

Fatal crashes on the I-26 main line killed 209 people from 2020 to 2024, in 179 crashes, or about 42 deaths a year. The rate works out to 12.7 deaths per 100 route miles a year. The Interstate network averages 9.5, so I-26 runs about a third higher and places 12th among 56 ranked Interstates, counting from the highest rate. Deaths hit 51 in 2021 after 48 in 2020, fell to 32 in 2022, then climbed to 37 in 2023 and 41 in 2024.

South Carolina accounts for 163 of the 209 deaths and has the highest state rate, 14.8. Tennessee follows at 9.6 with 26 deaths, and North Carolina's mountain section has the lowest rate, 7.6, with 20. South Carolina also claims every one of the top five counties: Orangeburg (29), where I-26 meets I-95, then Spartanburg (25), Lexington (23), Berkeley (19) and Charleston (18). Because I-26 has no overlap note in the Route Log, each state rate uses its plain Route Log mileage with nothing added.

Counties with the most I-26 crash deaths

Bridges on I-26

The 2025 National Bridge Inventory counts 296 bridges on the I-26 main line. Their median year built is 1969. Eight rate Poor, about 2.7 percent; 109 are Good and 179 Fair. Tennessee has the most bridges, 125 on 54.45 miles, while South Carolina has 113 across four times the distance. South Carolina also has the most Poor bridges, 5, ahead of Tennessee with 2 and North Carolina with 1.

The Peter Guice Memorial Bridge stands about 225 feet over the Green River between Flat Rock and Saluda, and Wikipedia describes it as North Carolina's highest bridge. The 2003 section north of Mars Hill added another bridge about 215 feet high. In Asheville, I-26 crosses the French Broad River on the Jeffrey Bowen Bridge, formerly the Smoky Park Bridge, an eight-lane, 1,315-foot structure from 1968 with no shoulders. In Columbia, SCDOT's Carolina Crossroads Phase 3D includes replacing the I-26 bridge over the Saluda River.

Tolls on I-26

Nothing on I-26 shows up in FHWA's list of toll facilities dated January 1, 2023, and a driver going from Kingsport to Charleston pays no tolls. Neither project page for the two big rebuilds on the route, NCDOT's Asheville connector and SCDOT's Carolina Crossroads in Columbia, mentions toll lanes.

I-26 auxiliary routes

Two three-digit routes carry the number today, both in South Carolina. I-126 is a 3.68-mile spur into downtown Columbia from the northwest, in place since 1961. I-526 is a 19.56-mile partial beltway around Charleston that serves North Charleston and Mount Pleasant, established in 1989. Two others are gone: I-326, an unsigned route approved in 1976 and dropped in 1995 in favor of I-77, and I-181 in Tennessee, absorbed into I-26 between 2003 and 2007.

How I-26 grew from the coast to Kingsport

I-26 has carried its number since August 14, 1957. South Carolina built first. Its 204 miles from Landrum to Summerville were the longest continuous stretch of Interstate under contract at the time, the first section opened in 1960, and the road reached from Spartanburg to Columbia by the end of that year. A 37-mile Lowcountry piece followed in late 1962, and the state finished its share in February 1969 after 12 years and $118 million.

North Carolina opened its first 14 miles, the Hendersonville bypass, in January 1967. The last original link, 7.5 miles from Columbus to Saluda, opened on October 29, 1976, bringing the state's cost to $54.1 million. Until 2003, I-26 ended at I-40 in Asheville.

Planning to push it north started in 1987. The roughly 9-mile, six-lane section from Mars Hill over Sams Gap to the Tennessee line opened in August 2003 at a cost of $230 million, 80 percent of it from the Appalachian Regional Commission. Its grades top out at 6 percent, against 9 percent on the old US 23, and it has a de-icing system, fog detection with warning lights and three runaway truck ramps. North Carolina added 31 to its exit numbers that year. In Tennessee, US 23 from Johnson City to Kingsport had carried the I-181 number since December 1985. I-26 replaced I-181 from Johnson City to I-81 when the Sams Gap section opened in August 2003. SAFETEA-LU in August 2005 extended it the rest of the way to Kingsport, and the last I-181 signs came down in March 2007.

Asheville and Columbia each have a large rebuild on the books. In Asheville, NCDOT's I-26 Connector covers about 7 miles and is funded at about $1.8 billion. It builds a new stretch of Interstate from the Haywood Road interchange across the French Broad River to US 19/23/70, taking through traffic off the Bowen Bridge. Wikipedia puts the main contract, awarded to Archer-Wright Joint Venture, at $1.15 billion. In Columbia, SCDOT's Carolina Crossroads project covers about 14 miles of I-20, I-26 and I-126 in Lexington and Richland counties, and Phase 3D, in design-build procurement as of November 2026, will rebuild the I-26/I-126 interchange and replace the I-26 bridge over the Saluda River.

I-26 traffic and road conditions

Tennessee, North Carolina and South Carolina each post I-26 closures and wrecks on their own traveler site, linked below. The crash numbers on this page end with 2024 and can't tell you about a wreck or closure today.

I-26 questions