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Lockport, city, seat (1822) of Niagara county, western New York, U.S. It lies 25 miles (40 km) northeast of Buffalo. It was founded in 1821 and grew around the series of five double locks (1847) of the Erie Canal built to overcome a difference of about 60 feet (18 metres) between the levels of Lake Erie and the Genesee River. Two modern locks (1918) of the New York State Canal System replaced one of the...