Beaver Brook East Stream Bridge (Middlesex County, Massachusetts)
Built 1850; rehabilitated 1921
Stone arch bridge over Beaver Brook East Stream on MA 113 (Pleasant Street) in Dracut
Open to traffic

Beaver Brook West Stream Bridge (Middlesex County, Massachusetts)
Built 1850; rehabilitated 1921
Stone arch bridge over Beaver Brook West Stream on MA 113 (Pleasant Street) in Dracut
Open to traffic

Bridge Street Bridge (Middlesex County, Massachusetts)
Built 1937
Through truss bridge over Merrimack River on Bridge Street in Lowell
Open to traffic

Concord River Bridge (Middlesex County, Massachusetts)
Built 1858; rehabilitated 1961
Stone arch bridge over Concord River on MA 110 in Lowell
Open to traffic

Morton Street Bridge (Middlesex County, Massachusetts)
Built 1929; rehabilitated 1982
Wooden bridge over BMRR on Morton Street in Lowell
Open to traffic

Walker Street Bridge (Middlesex County, Massachusetts)
Built 1910; rehabilitated 1994
Pony truss bridge over BMRR on Walker Street in Lowell
Open to traffic

Western Canal Bridge (Middlesex County, Massachusetts)
Built 1833; rehabilitated 1923
Stone arch bridge over Western Canal on Broadway in Lowell
Open to traffic