State Route 18
From State Route 100 to State Route 5 (U.S. 45) in Hardeman and Madison Counties.
Proposed Design
A total of six Build Alternatives are being considered for this project. The Build Alternatives include various options such as widening the existing SR-18 from two lanes to four lanes or a combination of widening the existing alignment and relocating at least some portion of the roadway on new alignment to the east of the existing roadway. The proposed project consists of 11 individual segments that were combined in various ways to form a total of six separate Build Alternatives.
Table 1 lists the Build Alternatives and identifies the individual alignment segments that comprise each alternative. The six Build Alternatives that have been carried forward for study in this EA are depicted on the alternatives map below.
Table 1. State Route 18 Build Alternatives and alignment segments.
Alternative |
Alignment Segments |
Total Length (Miles) |
Total New Alignment |
1 (Widen Existing SR‑18) |
A-1, A-2, A-3, A-4 | 14.6 | 0.0 |
2 |
A-1, B-1, B-2, B-3, B-4 | 14.1 | 10.8 |
3 |
A-1, A-2, A-3, C-3, B-4 | 14.6 | 5.4 |
4 |
A-1, B-1, B-2, C-2, A-4 | 14.6 | 5.9 |
5 |
A-1, B-1, C-1, A-3, A-4 | 14.8 | 3.2 |
6 |
A-1, B-1, C-1, A-3, C-3, B-4 | 14.8 | 8.6 |
Click here to view a map of Build Alternatives 
The typical section proposed for all rural segments consists of a four-lane divided roadway, with four 12-foot lanes separated by a 52-foot depressed median (includes two 6-foot inside shoulders) and two 12-foot outside shoulders within a 250-foot ROW. The typical section proposed for urban areas consists of a 92‑foot ROW containing four 12-foot lanes with a 12- foot center left turn lane, two 4-foot outside shoulders, and curb and gutter. Five-foot sidewalks would be included on both sides of the roadway in the urban areas.
The drawings below depict the cross sections for the urban and rural segments of the proposed roadway.
Governor Bill Haslam
