The Hiram M. Chittenden Locks large chamber will close to marine traffic from 8:00 to 11:00 a.m. Tuesday, Dec. 15, for dive work related to pump plant construction. Work is rescheduled from the original time and date of 8:00 to 11:00 Wednesday, Dec. 9. The small chamber lock is not affected and will be operating normally. Pedestrian traffic is not affected.