A major Tennessee Department of Transportation project aimed at widening Interstate 24 between Dade County, Georgia and Chattanooga is now expected to cost hundreds of millions more than originally projected.
The proposed project would widen roughly 10 miles of I-24 from Interstate 59 near the Georgia state line to the downtown Chattanooga area, expanding the heavily traveled corridor from four lanes to six lanes in an effort to reduce congestion and improve traffic flow.
For many residents of Marion County communities such as Jasper, Kimball, South Pittsburg, and other communities in the valley, the interstate serves as a critical route for commuting to jobs, medical appointments, shopping, and other services in Chattanooga. Traffic backups — especially near the Dade County line and around Lookout Mountain — have long been a source of frustration for local drivers traveling to and from Hamilton County.
According to TDOT, the project has been under study for years and remains in the environmental review and preliminary engineering phase. Construction on the Tennessee portions of the project is currently targeted to begin in 2027, with on-site work potentially starting in late 2027 or 2028.
Initial estimates for the widening project were reported around $246 million when the proposal was first publicly discussed. However, updated estimates have now climbed by more than $300 million, reflecting increasing construction costs, engineering challenges, inflation, and the complexity of work through the mountainous and heavily traveled Chattanooga corridor.
The interstate stretch is considered one of the region’s busiest freight and commuter corridors, carrying large volumes of truck traffic between Nashville, Chattanooga, Atlanta, and Birmingham. TDOT officials say the additional lane capacity would help ease backups, improve emergency response access, and reduce crash-related congestion.
Public reaction to the project has been mixed. While many drivers support efforts to address long-standing traffic problems around Chattanooga, some residents and transportation advocates have raised concerns about cost, environmental impacts, and whether widening alone will solve congestion issues.
The project remains part of TDOT’s long-range transportation plans, though final timelines and funding details could continue to evolve as design work progresses.
