This from TDOT:
On Thursday 8/20/2020 and Friday 8/21/2020 the Bachman Tubes tunnel on U.S. 41 South (from Chattanooga toward East Ridge) in Hamilton County will be closed between 6:00 a.m. and 3:00 p.m. to allow TDOT crews to replace damaged overhead lights with new lights. Detours will be posted during this work.