Last updated: April 18, 2026
- Route: Interstate 24 (Illinois – Chattanooga, TN)
- Marion County segment: Sequatchie Valley crossing, Monteagle Mountain grade, Kimball interchange, Jasper
- Built through county: 1960s–1970s
Interstate 24 crosses Marion County on its run from Nashville to Chattanooga. Its construction through the county in the 1960s and 1970s reshaped the local economy: it made the Sequatchie Valley a day-commute and day-visit destination from Chattanooga, concentrated retail and service businesses at the Kimball interchange, and made the long-standing mountain crossing at Monteagle Mountain a piece of federal infrastructure rather than a purely local road.
Monteagle Mountain grade
The most famous stretch of I-24 in Marion County is the Monteagle Mountain climb, where the highway rises from the Sequatchie Valley floor to the top of the Cumberland Plateau at Monteagle. The grade, combined with frequent fog, ice, and heavy truck traffic on a route that carries freight between the Midwest and the Gulf Coast, has made Monteagle Mountain one of the better-known mountain passes in the U.S. interstate system. Runaway truck ramps, variable speed limits, and weather advisories are standard features of the road.
Kimball interchange
The I-24 / U.S. 72 interchange at Kimball became the county's commercial center after the interstate opened. Retail strips, fuel stops, restaurants, and lodging clustered along the interchange and displaced downtown Jasper and South Pittsburg as the default commerce node for the county. Kimball's growth through the late 20th century tracks almost exactly with I-24 traffic volumes. Read more about Kimball →
Economic impact
Beyond the interchange-area retail, the interstate opened Marion County to distribution-oriented employers, tourism traffic, and Chattanooga-area commuters. It also contributed to the decline of downtown-centered commerce in the older industrial-era towns. Tourism to Foster Falls, the Tennessee River Gorge, Nickajack Lake, and Sweetens Cove Golf Club all benefits from I-24 access.
Related
About Kimball →
About Monteagle →
About Jasper →