The Lowell Power Canal System is the largest power canal system in the United States, at 5.6 miles in length. The system's estimated output is 10,000 horsepower, operating six major canals on two levels, controlled by numerous gates. The system was begun in the 1790s, beginning its life as a transportation canal called the Pawtucket Canal, which was constructed to get logs from New Hampshire down the Merrimack River to shipbuilding centers at Newburyport, Massachusetts, bypassing the 30-plus-foot drop of the Pawtucket Falls.In the early 1820s, Associates of the recently deceased Francis Cabot Lowell bought up the old Pawtucket Canal in what was then East Chelmsford, Massachusetts. Within a few years, the new industrial center that became Lowell was using canals feeding off of a widened and deepened Pawtucket Canal as a direct power source for their textile mills. The first of these canals was the Merrimack Canal, which powered the Merrimack Manufacturing Company. The repurposing of the Proprietors of Locks and Canals allowed the Associates to sell water power to other companies, starting with the Hamilton Canal, leading to the explosive growth of the town, and then shortly thereafter, city, of Lowell.
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