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| Keywords: Lock 70 on C and O Canal from NPS.jpg en Lock 70 NPS site says Lock 69 Sic Should be 70 is the 12th of the 13 composite locks 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 Lock 70 is one third of a mile below Lock 71 and one fourth of a while above Lock 69 The lock is watered between Lock 70 and 71 The Canal Company took advantage of an exisiting creek Mill Run to locate this lock and the canal bed above the lock The upper end of the lock is dammed with concrete and the lock below carries water to within a foot and a half of normal canal operating level In the early 1900s the wood lining was replaced with concrete Both lower extension wingwalls are also covered with a thin layer of concrete The original wood coping was also replaced with concrete except below the lower gate pockets which is stone probably a re-use of cut stones from another location The remains of the upper lock gates remain in a closed position and much of the gate hardware both upper and lower appears to have been replaced at the time of the installation of concrete The remains of a stone filled wood cribbage is seen above the upper berm wingwall used to separate the flow of water to the lock and the bypass flume The pedestrian bridge across the lock has been replaced several times the current wooden bridge is a recent replacement National park Service http //www hscl cr nps gov/insidenps/report asp STATE PARK CHOH STRUCTURE SORT RECORDNO 1039 National Park Service Dept of Interior US Government Chesapeake Ohio Canal National Historical Park Locks water transport PD-USGov | ||||
