Tennessee State Route 390State Route 390 is a state highway in the cities of Bluff [City, Tennessee|Bluff City] and Bristol in Sullivan [County, Tennessee].Route descriptionSR 390 begins at SR 44 in Bluff City and goes north and cross over the South [Fork Holston River] and Boone Lake. It continues north to SR 394 and turns left to become concurrent with it before coming to an end at an interchange with US 11E/U.S. [Route 19 in Tennessee|US 19]. SR 394 continues straight.