State Route 109 WideningSumner and Wilson Counties
Completed and proposed improvements for State Route 109, from Interstate 65 in Sumner County to Interstate 40 in Wilson County, include reconstruction and widening for nearly 35 miles. These improvements are intended to address congestion, improve safety and traffic operations, and accommodate growth along this rapidly developing corridor.
The existing roadway is primarily two lanes. The completed projects and proposed designs widen the existing roadway to a four- or five-lane facility, including 12-foot travel lanes in each direction with either a dedicated center turn lane or dividing median (depending on area) and paved shoulders.
Due to the significant length of the corridor and costs associated with right-of-way acquisition and construction, SR 109 improvements have been separated into smaller sections or phases as noted below.
- from the Gallatin Bypass north of Gallatin to SR 52 in Portland (11.5 miles)
- Gallatin Bypass from Airport Road to Scotty Parker Road (6.0 miles) - new alignment
- from north of the Cumberland River bridge to the Gallatin bypass south of Gallatin (1.3 miles)
- bridge over the Cumberland River - replacement
- from south of Dry Fork Creek to south of the Cumberland River bridge (3.7 miles)*
- from north of SR 24 (US 70) to south of Dry Fork Creek (3.4 miles)*
- from north of I-40 to south of SR 24 (US 70)
*Due to the funding challenges and expected time frames of the projects south of the Cumberland River bridge, a resurfacing project was approved to prevent further deterioration of the currently used roadway. Resurfacing the roadway helps preserve the underlying pavement structure, which will be incorporated into the new widening projects, and provides a smoother, safer road for the motoring public, decreases wear and tear on vehicles, and greatly reduces the cost of maintenance activities for now and during construction.
In addition to the proposed widening projects, a new interchange is currently under construction in Sumner and Robertson Counties, which will connect I-65 with a new alignment of SR 109. A new bypass is also under development, which will be constructed to the west of the city of Portland.
Purpose and Need
SR 109 has been identified as a strategic corridor, serving as the primary north-south connector between I-65 in Sumner County and I-40 in Wilson County, northeast of downtown Nashville. It is a heavily traveled corridor, connecting several communities in middle Tennessee. Traffic counts along the corridor range from 10,000 to 25,000 vehicles per day, depending on the location of the route in Sumner and Wilson Counties. The completed and proposed improvements are designed to increase capacity and improve safety and traffic operations along the entire route.
Separate from the planned improvements, TDOT is currently working with the Nashville Area Metropolitan Planning Organization (MPO) and locally elected officials on a State Route 109 Access Management Study that will ultimately provide a state and local Corridor Management Agreement. The study will look at congestion, connectivity, bicycle, pedestrian, and transit infrastructure, safety, and economic growth. Recommendations from the study could lead to improvements in traffic flow and land-use along the corridor that would further ease congestion and improve capacity. This would be a future benefit not only to TDOT, but to the local partners and the driving public as well, by providing a safer and more efficient corridor.