File:Lock 67 Darbeys Lock from NPS.jpg

English: Lock 67. NPS site says: Lock 67 is the 9th Composite Lock. 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.

In the early 1900's that all the wood was removed and a new 9 ¼ ' concrete wall was poured on each side to bring the lock to the standard 15' clear dimension for its interior. This pour included the lower lock gate pockets, plus a thin concrete plaster coat for the upper lock gate pockets. The upper pockets were not originally wood lined and the thin concrete coating has mostly peeled off, exposing the original stone pocket. As was standard, only the corners of the lower ends of both the lock pockets were coped in stone; all other original coping was wood and was replaced by the concrete. Both upper extension walls are about 5' long, turning at 90° into short wingwalls. The lower extension walls run about 13' then splay out at about 60° for a 14'

run. The berm wall turns again to run perpendicular to the lock for about 23' to a 10 ½ ' wide opening f or the by-pass flume lower exit. The towpath approach to the lower end of the lock i s dry-walled for about 100'.