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Interstate 75 Interchange at Interstate 24

Hamilton County

NOTE: Heavy construction is expected to begin in fall 2019. Public meetings are currently scheduled to discuss the anticipated impact to motorists and neighboring communities. For more information, visit the Public Involvement section of this website.

Overview

The planned improvements to the interchange at Interstate 75 and Interstate 24 in Hamilton County will consist of modification and reconstruction between the Georgia state line and west of the East Brainerd Road interchange on I-75 and between Spring Creek Road and the I-75/I-24 interchange on I-24.

The improvements will increase the safety, efficiency, and operation of the interstate, while providing congestion relief and addressing the deficiencies of the existing interchange.

aerial view of I-75/I-24 Interchange in Hamilton County

Purpose and Need

The existing I-75/I-24 interchange is a heavily traveled corridor that serves Tennessee and Georgia. Both I-75 and I-24 provide a direct connection to downtown Chattanooga, Lookout Mountain, and other area attractions, while I-24 also serves as a direct link between I-75 and I-59.

Continued growth and increased traffic volumes along the I-75 and I-24 corridors have increased concerns for the safety of the interchange. A review of the project area revealed ramp geometry, merging distances, and Welcome Center access as operational deficiencies.

Interchange modifications are necessary to increase capacity, correct merge points, and enhance ramp function. The planned design will improve the safety and operation of the interchange, while providing a facility that meets traffic demands.

aerial view of I-75 Tennessee Welcome Center

Design

The existing project area is along the I-75 and I-24 corridors located southeast of Chattanooga in Hamilton County. The project extends from Spring Creek Road over I-24 to approximately one mile west of the I-75 interchange to East Brainerd Road. The total roadway length is 2.7 miles.

Within the project area, I-24 is primarily a six-lane, controlled-access facility, separated by a concrete barrier wall with a right-of-way width of approximately 500 feet. I-75 is primarily an eight-lane, controlled-access facility, separated by a concrete barrier wall with a variable right-of-way width of approximately 300 to 600 feet.

The planned design consists of widening the existing roads and ramps, increasing ramp radii, reconfiguring I-24 ramps to enter and exit I-75 from the right side, shifting the interchange to the west, and modifying the Welcome Center area traffic circulation.

The project will also include new bridges for Spring Creek Road over I-24, as well as interstate bridges. Retaining walls will be required along interstate ramps and between I-75 and the Welcome Center area.

The above video explains the construction plans for the I-75/I-24 Interchange Modification Project.

Email Updates

To receive email updates on this project, including lane closure information, follow the instructions below.

  • Click the email link: LISTSERV@LISTSERV.TN.GOV
  • In the message body, cut and paste the following information: Subscribe¬† JJ_I75I24_PROJECT
  • Send email. (no subject line necessary)