Cambridge, Massachusetts

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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

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-spandrel arch bridge over Charles River, Museum Way, and Charlestown Avenue on MBTA Green Line
Open to traffic