Ayer, Massachusetts

ST - Nashua River Bridge (Middlesex County, Massachusetts)
Built 1883
Abandoned pratt through truss bridge over Nashua River on B&M Greenville Branch
Derelict/abandoned

ST - West Main Street Overpass (Middlesex County, Massachusetts)
Built 1897
Pony/through plate girder bridge over West Main Street on B&M Greenville Branch
Open to traffic