Pennsylvania Historic Preservation

Blog of the Pennsylvania State Historic Preservation Office

Concrete bridge over stream.

March 16, 2022
by Tyra Guyton
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Pennsylvania’s Reinforced Concrete Thru Girder Bridges

Few people think of history when crossing a bridge.  But bridges tell an important story about engineering and technology, especially in Pennsylvania where the early years of iron, steel and concrete came together to produce many early bridges that represent … Continue reading