Nickajack Lock at Tennessee River mile 424.7 in Jasper, Tennessee, is closed Sept. 15 through 6 p.m. Oct. 5, 2020. The lock will then undergo intermittent closures between 6 a.m. and 4 p.m. daily Oct. 6-13, 2020. It will resume normal operations 4 p.m. Oct. 13, 2020. The lock closures allow maintenance personnel to perform repairs on the upper and lower lock gates. Call the lock at 423-667-0280 for more information. This announcement is a related update to Navigation Notice 20-26.