At approximately 3:00 p.m. today, October 21, 2021, navigation traffic was halted to facilitate a hydraulic cylinder repair on the main (1,200 foot) lock chamber at Markland Locks and Dam (Ohio River Mile 531.5). The closure will last until approximately 12:00 p.m. (EDT) on Saturday, October 23, 2021. Upon completion of the hydraulic cylinder repairs, traffic will resume in the main chamber.