East Hampton, Connecticut

Air Line State Park Trail - Muddy Gutter Brook Arch (Middlesex County, Connecticut)
Built 1870; abandoned 1965; opened to trail users ca. 2016
Abandoned stone arch bridge over Muddy Gutter Brook on NYNH&H Air Line (abandoned)
Open to pedestrians and bicycles

Air Line State Park Trail - Pocotopaug Creek Bridge (Middlesex County, Connecticut)
Converted to trail use 2012
Deck plate girder bridge over Pocotopaug Creek on Airline State Park Trail - South in East Hampton
Open to pedestrians only

Comstock Covered Bridge 07-04-01 #2 (Middlesex County, Connecticut)
Built 1873, rebuilt 2011
Howe through truss bridge over Salmon River on Bridge Street
Open to pedestrians only

CT 16 Salmon River Bridge (Middlesex County, Connecticut)
Built 1932; rehabilitated 1986
Concrete stringer bridge over Salmon River on CT 16/Colchester Avenue in East Hampton
Open to traffic

NH - Mine Brook Arch (Middlesex County, Connecticut)
Abandoned 1965
Abandoned stone arch bridge over Mine Brook on NYNH&H Air Line (abandoned)
Derelict/abandoned