File:Lock 64 and two thirds from NPS.jpg

English: Lock 64⅔. NPS site says: Lock 64-532 [Sic]; is the 6th of the 13 composite locks and had a 10 lift’. These locks differ from the other locks on the canal. Between the upper end of the lower gate pockets to the lower end of the upper gate pockets the stone walls were moved 9 ¼° on each side, resulting in a clear dimension between lock walls of 16’-16 ½” rather that the 15’ previously adhered to. The normal clear dimension was resumed both up and down from these points. The walls were of rough-cut and rough-coursed limestone, principally dry-laid where the walls were widened and mortared in the other areas. The wider area was filled in with 5 ¼” square timbers. This wooden section of the lock was “water-proofed” at first by being “kyanized” and later with creosote. The wood timbers required frequent replacing, and around 1900 many repairs were made by stripping out the wood and pouring a cement liner.

At Lock 64-532;, concrete has replaced the wood lining in both the upper and lower lock pockets. The original stone coping of the corners of the gate pockets was retained but the wood coping for the approximate 10’ length of the pockets was also replaced by concrete. The wood coping for the run of the lock and above the pockets was also retained, but is now gone.

The lower berm wingwall is buttressed with a 4½’ wide stone wall that is stepped down in its 25’ length parallel to the run of the lock. This buttress helped to keep the turbulence created by the bypass flume discharge separate from the water at the lock entrance.

Some of the wooden sheathing remains along the mid-lock walls and many of the bolts.