Completed in 1796, the Pawtucket Canal was originally built as a transportation canal to circumvent the Pawtucket Falls of the Merrimack River in East Chelmsford, Massachusetts. In the early 1820s it became a major component of the Lowell power canal system. with the founding of the textile industry at what became Lowell.
The Pawtucket Canal powers the town of Lowell
The Pawtucket Canal was built as a major component of a power canal system 200 years ago. We don't know whether it played a part in actually powering the town or just the canal. It might also be that it powered the town at the time, but in 200 years technology has moved on. The system did not understand that because something was built in 200 years ago it doesn't mean it is definitely still in existence today. 
( z1 power :ARG0 ( z2 canal :name ( z3 name :op "Pawtucket" :op "Canal" ) ) :ARG1 ( z4 town :name ( z5 name :op "Lowell" ) ) )