Nickajack Lock at Tennessee River mile 424.7 in Jasper, Tennessee, is undergoing a series of closures to perform repairs on the upper and lower lock gates. The lock is closing 6 a.m. Sept. 15 until 6 p.m. Oct. 1, 2020. The lock will then undergo intermittent closures 6 a.m. to 4 p.m. daily from Oct. 6 through Oct. 13, 2020. For more information, call the lock at 423-667-0280.