The Build Alternative selected includes construction of a four-lane, partial access controlled facility extending from existing SR-109 south of SR-76 northward to the existing SR-109 (North Broadway) north of downtown Portland. The southern end of the project will tie into the recently constructed four-lane segment of relocated SR-109 and the northern end will tie into the southern end of the proposed relocated SR-109 currently under design as part of the overall new I-65/SR-109 Interchange project. The Portland Bypass will complement the other improvements that have been completed or are currently being planned and/or developed along the improved SR-109 corridor from I-40 in Wilson County to I-65 in Robertson County.
Each of the four traffic lanes would be 12 feet wide. Outside shoulders would be 12 feet wide (10-foot paved, 2-foot gravel) and inside shoulders would be 6 feet wide (4-foot paved, 2-foot gravel). The ROW would be approximately 250 feet wide with some exceptions along the route. The design speed of the roadway will be 60 mph, but the actual posted speed could be lower based on input from local officials.