NJ 31

Furnace Brook Bridge (Warren County, New Jersey)
Built 1926; rehabilitated 1953
Stone arch bridge over Furnace Brook on NJ 31
Open to traffic

Pequest River Bridge (Warren County, New Jersey)
Built 1922
Concrete arch bridge over Pequest River on NJ 31
Open to traffic

Willoughby Brook Bridge (Hunterdon County, New Jersey)
Built 1930
Concrete arch bridge over Willoughby Brook on NJ 31
Open to traffic