Somerville, Massachusetts

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BM - Mystic River Drawbridge (Suffolk County, Massachusetts)
Built 1893-4; Deck trusses added 1917; Tower rebuilt 1933; Stringers added 1955-56; Replaced 1989
Warren deck truss bridge over Mystic River on Boston & Maine Railroad
Replaced by a new bridge

Cross Street Bridge (Middlesex County, Massachusetts)
Built 1928; rehabilitated 2014
Through truss bridge over MBTA/BMRR on Cross Street in Somerville
Open to traffic

Dana Bridge (Middlesex County, Massachusetts)
Steel stringer bridge over Mystic River on MBTA Orange Line & Commuter Rail Haverhill Line
Open to traffic

Henderson Street Bridge (Middlesex County, Massachusetts)
Built 1913
Closed-spandrel arch bridge over Alewife Brook on Henderson Street
Open to traffic

Lowell Street Bridge (Fitchburg Cutoff) (Middlesex County, Massachusetts)
Built 1910; replaced 2006
Lost pony truss bridge over B&M Fitchburg Freight Cutoff on Lowell Street in Somerville
Replaced by a new bridge

Lowell Street Bridge (New Hampshire Mainline) (Middlesex County, Massachusetts)
Built 1910; replaced 2006
Lost pony truss bridge over MBTA/BMRR on Lowell Street in Somerville
Replaced by a new bridge

MBTA - High Line Bridge (Middlesex County, Massachusetts)
Built 1927; rehabilitated 1946 & 1956; scheduled for replacement in 2021
Warren through truss with sub-panels bridge over MBTA Yard Tracks on MBTA Lowell Line
Open to traffic

MBTA - North Station Charles River Bridges (Middlesex County, Massachusetts)
Built 1931, two bridges removed at a later date
Baltimore through truss bridge over Charles River on MBTA North Station Leads
Open to traffic

MBTA - Washington Street Overpass (Middlesex County, Massachusetts)
Built 1927 by Boston Bridge Works
Steel stringer bridge over Washington Street on MBTA Lowell Line and Future Green Line Extension
Open to traffic

MBTA Mystic River Bridge (Middlesex County, Massachusetts)
Steel stringer bridge over Mystic River on MBTA Commuter Rail Newburyport/Rockport Line
Open to traffic

McGrath Highway Bridge (Middlesex County, Massachusetts)
Built 1926 (NBI says 1908); rehabilitated 1983
Through truss bridge over MBTA/BMRR on MA 28 (McGrath Highway) in Somerville
Open to traffic

Mystic Valley Parkway Alewife Brook Bridge (Middlesex County, Massachusetts)
Built 1908; reconstructed 2013
Closed-spandrel arch bridge over Alewife Brook on Mystic Valley Parkway
Open to traffic

Sacramento Street Underpass (Middlesex County, Massachusetts)
Built 1897
Steel stringer bridge over pedestrian tunnel on MBTA Fitchburg Line
Open to traffic

Sycamore Street Bridge (Middlesex County, Massachusetts)
Built 1902; rehabilitated 1957; replaced 2006
Lost pony truss bridge over MBTA/BMRR on Sycamore Street in Somerville
Replaced by a new bridge

Webster Avenue Bridge (Middlesex County, Massachusetts)
Built 1911
Girder bridge over MBTA Fitchburg Line on Webster Avenue
Open to traffic

Wellington Bridge (Middlesex County, Massachusetts)
Built 1935; rehabilitated 1979
Steel stringer (and former bascule) bridge over Mystic River on Fellsway (Massachusetts Route 28)
Open to traffic