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Shawsheen River Aqueduct, Middlesex Canal, Billerica, Massachusetts.

Map of the Middlesex Canal, 1801.

The Middlesex Canal was a 27-mile (44 km) barge canal connecting the Merrimack River with the port of Boston. When operational it was 30 feet (9.1 m) wide, and 3 feet (0.9 m) deep, with 20 locks, each 80 feet (24 m) long and between 10-11 (3.0-3.3 m) feet wide. It also had 8 aqueducts.

The canal was chartered on June 22, 1793 with a signature by Governor John Hancock, and was built between 1795 and 1803 under the engineering guidance of Loammi Baldwin, with the aim of opening up the vast interior of New England to merchant capital. Its first boat operated on April 22, 1802.

The canal ran from Middlesex Village in East Chelmsford, Massachusetts, later Lowell, through several Middlesex County towns, terminating near Charlestown, Massachusetts. A series of other canals along the Merrimack allowed freight to be transported as far inland as Concord, New Hampshire. The water source for the canal was the Concord River at Billerica. This was also the highest point of the canal.

Freight boats required 18 hours from Boston up to Lowell, and 12 hours down, thus averaging 2.5 miles per hour; passage boats were faster at 12 and 8 hours respectively (4 miles per hour). Roundtrip between Boston and Concord, New Hampshire, usually took 7-10 days.

The Canal was one of the main thoroughfares in New England until the advent of the railroad. In fact, the Boston and Lowell Railroad (now a part of the MBTA Commuter Rail system) was built using the plans from the original surveys for the Canal. Portions of the line follow the Canal route closely, and the Canal was used to transport the construction materials for the railroad.

The canal was no longer economically viable after the introduction of railroad competition, and it was abandoned after 1851. The Middlesex Turnpike, incorporated 1805, also contributed to its downfall. The proprietors proposed to convert it into an aqueduct to bring drinking water to Boston, but this effort was unsuccessful. Parts of the canal bed were covered by roads in the 20th century, including the Mystic Valley Parkway in portions of Medford and Winchester.

A particularly fine segment of the canal; most has reverted to nature or vanished.

Map of lower stretch of Middlesex Canal, 1852.

• Middlesex Canal Association
• History of Middlesex Canal, with links
• New England Magazine article, January 1898