External links Middlesex Canal Association Paintings: Middlesex Canal by Joseph Payro 1930s Billerica, Massachusetts Canal museums in the United States Canals in Middlesex County, Massachusetts Canals on the National Register of Historic Places in Massachusetts Canals opened in 1803 Chelmsford, Massachusetts Historic Civil Engineering Landmarks Historic districts on the National Register of Historic Places in Massachusetts History of Massachusetts Merrimack River Mystic River National Register of Historic Places in Lowell, Massachusetts National Register of Historic Places in Medford, Massachusetts National Register of Historic Places in Middlesex County, Massachusetts National Register of Historic Places in Winchester, Massachusetts Transportation in Lowell, Massachusetts Transportation in Medford, Massachusetts Transportation in Somerville, Massachusetts Wilmington, Massachusetts Winchester, Massachusetts Woburn, Massachusetts