Navigation Notice 21-19: Construction activities at Kentucky Lock at Tennessee River mile 22.4 in Grand Rivers, Kentucky, will cause some minimum impacts to users of the existing chamber into late summer 2021. The impacts are expected to be short closures from 30 minutes to two hours, once a day, during the hours of 7 a.m. to 7 p.m. Mariners are encouraged to call the lock at 270-362-4226 or by marine radio on channels 13 and 16 for more information.