The remaining Sullivan County portions were contracted for construction in December 1970 and March 1971, and sections in Washington and Greene Counties were let in November and December 1971. The last construction contract for I-81 in Tennessee, which was for the northernmost  in Greene County, was awarded in March 1972.
The remaining Sullivan County sections were contracted for construction in December 1970 and March 1971, and areas in Washington and Greene Counties were awarded contracts in November and December 1971. The final construction contract for I-81 in Tennessee, covering the northernmost part of Greene County, was granted in March 1972.