In his article in American Heritage Magazine in 1994 titled The Golden Age of the Iron Bridge, Eric DeLony wrote that cast iron and wrought iron bridges are "the rarest and least appreciated . . . Yet in some ways [they are] the most technologically significant." Their heyday was between 1840 and 1880, after the age of wood and before the age of steel.  Cast iron is an iron alloy with high carbon content that, while in common use in Roman times, first became economical at the beginning of the Industrial Revolution in the mid-18th century.  Wrought iron has lower carbon content and is more flexible.  The bridges on this page reflect historic iron bridges.
   

Bell Avenue Bridge  

Glen Gardner, New Jersey

(1896)

School Street Bridge

Glen Gardner, New Jersey

(1870)

Main Street Bridge

Clinton, New Jersey

(1870)

Higginsville Bridges

Hillsborough, New Jersey

Musconetcong Bridge

New Hampton, New Jersey

Province Line Road Bridge

Upper Freehold Township, NJ

(1891)

Walnford Mill Road Bridge

Upper Freehold Township, NJ

(1885)

Rosemont-Raven Rock Road Bridge

Sergeantsville, New Jersey

(1878)