Cambridge, Massachusetts

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Alewife Station Access Road Underpass (Middlesex County, Massachusetts)
Built 1984
Deck arch bridge over Alewife Station Access Road on US 3 (Alewife Brook Parkway)
Open to traffic

Charles River Dam Bridge (Suffolk County, Massachusetts)
Built 1910 as a pair of parallel single leaf bascules; entire superstructure and mechanics demolished and replaced in 1962 with double-leaf bascule; rehabilitated 1992; entire superstructure replaced 2010-2011 with fixed trunnion bascule.
Bascule bridge over Charles River on MA 28 in Boston
Replaced by a new bridge

Commercial Avenue Bridge (Middlesex County, Massachusetts)
Built 1907; major rebuild 1938; fixed closed 1974; replaced 1986
Lost deck plate girder bridge over Lechmere Canal on Commercial Avenue
No longer exists

Edwin H. Land Boulevard Bridge (Middlesex County, Massachusetts)
Built 1956
Bascule bridge over Broad Canal on Land Blvd. in Cambridge
Open to traffic

Eliot Bridge (Suffolk County, Massachusetts)
Built 1950
Brick-faced concrete arch bridge over Charles River on Eliot Bridge in Boston
Open to traffic

First Street Bridge (Middlesex County, Massachusetts)
Built 1925; reconstructed 1938, 1957 & 2000
Deck plate girder bridge over Broad Canal on First Street
Open to traffic

Lechmere Canal Bridge (Middlesex County, Massachusetts)
Built 1986 to replace previous Commerical Avenue Bridge
Closed-spandrel arch bridge over Lechmere Canal on Edwin H. Land Boulevard
Open to traffic

Leverett Circle Connector Bridge (Suffolk County, Massachusetts)
Built 1999 as part of the "Big Dig" project
Concrete box girder bridge over Charles River on Leverett Circle Connector
Open to traffic

Massachusetts Avenue Bridge (Middlesex County, Massachusetts)
Stone arch bridge over Alewife Brook on Massachusetts Avenue
Open to traffic

MBTA - Lechmere Viaduct (Middlesex County, Massachusetts)
Built 1910; Closed for rehabilitation as part of Green Line Extension project in 2019
Closed-spandrel arch bridge over Charles River, Museum Way, and Charlestown Avenue on MBTA Green Line
Closed to all traffic for rehabilitation as part of Green Line Extension project

Memorial Drive Bridge (Middlesex County, Massachusetts)
Built 1940; rehabilitated 1982
Girder bridge over Brookline Street on US 3 (Memorial Drive)
Open to traffic

North Bank Bridge (Suffolk County, Massachusetts)
Modern Pratt pony truss bridge over Millers River Basin on Charles River Esplanade North
Open to pedestrians