The SR 91 project, located in Elizabethton, Tennessee, was initiated at the request of local elected officials in 1996. The environmental process for the project began in 1998. An Environmental Assessment (EA) was completed in June, 2002. Additional technical studies were conducted between 2003 and 2006. As a result, potential significant environmental impacts were identified. In June 2006, due to the potential significant environmental impacts and public concern, the required environmental documentation was elevated to an Environmental Impact Statement (EIS).