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In page Erie Canal:

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In 1823 construction reached the Niagara Escarpment, an 80-foot (24 m)-high wall of hard dolomitic limestone. The route followed the channel of a creek that had cut a ravine steeply down the escarpment. The construction and operation of two sets of five locks along a 3-mile (4.8 km) corridor soon gave rise to the community of Lockport. The 12-foot (3.7 m) lift-locks had a total lift of 60 feet (18 m), exiting into a deeply cut channel. The final leg had to be cut 30 feet (9.1 m) deep through another limestone mass, the Onondaga ridge. Much of that section was blasted with black powder, and the inexperience of the crews often led to accidents, and sometimes to rocks falling on nearby homes.[citation needed]