Middlesex Canal

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The Middlesex Canal was an early American engineering feat in Massachusetts. It was a 27-mile barge canal that connected the Merrimack River with Boston Harbor. Built from 1793 to 1803 and operating mainly in the early 1800s, it stayed in use until 1851 when railroads and other transport methods made it less competitive.

Route and purpose
- The canal ran from the Concord River at North Billerica, the highest point of the route, down to the Charles River in Charlestown, Boston. It later connected to parts of eastern Massachusetts and, through other canal companies, reached inland areas like Concord, New Hampshire.
- It carried freight and passengers, helping Boston receive goods from the interior and supporting the growth of industrial towns such as Lowell.

Size, design, and innovations
- When complete, the canal was about 30 feet wide and 3 feet deep, with 20 locks (each about 80 feet long) and eight aqueducts.
- It used hydraulic cement to seal the locks, one of the first such uses in North America.
- An innovative floating towpath helped transport boats across the Concord River.

Construction and people
- The Middlesex Canal Corporation was chartered in 1793. James Sullivan served as president, and Loammi Baldwin was the chief engineer.
- The canal’s route was first surveyed in 1793 by Baldwin and others, with assistance from engineer William Weston.

Operation and impact
- Freight and people moved along the canal, with boats taking roughly 18 hours upstream to Lowell and about 12 hours downstream, while passenger trips were faster.
- The canal helped Lowell grow into a major industrial center and reduced the importance of other routes, such as some parts of the Pawtucket Canal.
- It was the main transport route in eastern New England for several decades, until railroads became the preferred method for moving bulk goods.

Decline and legacy
- The canal faced competition from railroads and the Middlesex Turnpike and stopped making money; tolls ended in 1851.
- There were plans to repurpose the canal for Boston drinking water, but that never happened.
- In 1967, the American Society of Civil Engineers named the canal a National Historic Civil Engineering Landmark. Parts of the canal are preserved as historic sites, and the full route is listed on the National Register of Historic Places (two listings, 1972 and 2009).

Remnants today
- Remains of the canal can be seen in places like Wilmington, Billerica, and Woburn, with aqueduct remnants in Medford and Winchester. Many sections have been built over by roads and new developments.
- The Middlesex Canal Association preserves the history and operates a museum in North Billerica at the Faulkner Mills. Their site offers directions and more information about visiting.