Portland, Connecticut

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Air Line Railroad Bridge (Middlesex County, Connecticut)
Built 1872; Destroyed by Steamboat collision 1876; Replaced 1886
Lost Quadrangular lattice through truss bridge over Connecticut River on New York, New Haven & Hartford Railroad
Replaced by a new bridge

Air Line State Park Trail - Great Hill Pond Brook Arch (Middlesex County, Connecticut)
Built 1899; abandoned 1965
Abandoned stone arch bridge over Great Hill Pond Brook on NYNH&H Air Line (abandoned) in Portland
Open to pedestrians and bikes

Air Line State Park Trail - Unnamed Brook Arch (Middlesex County, Connecticut)
Abandoned bridge over Unnamed Creek on NY&Boston Airline/NewHaven RR in Portland
Open to pedestrians and bikes

Arrigoni Bridge (Middlesex County, Connecticut)
Built 1938; rehabilitated 1994
Steel through arch bridge over Connecticut River on CT 66 in Middletown
Open to traffic

Portland Passenger Bridge (Middlesex County, Connecticut)
Built 1896 by Berlin Iron Bridge Co.; Damaged by flood 1936; Demolished 1938
Lost swing bridge over Connecticut River on Main street
Replaced by a new bridge

PW - Middletown Swing Bridge (Middlesex County, Connecticut)
Replaced an earlier bridge at this location built in 1872.
Swing through truss bridge over the Connecticut River on the Connecticut Central Railroad in Middletown
Open to traffic