Historic Bridges in Pennsylvania

6,062 bridges built before 1951 in Pennsylvania still in service today.

Bridges Built Before 1951

The United States has 6,062 bridges in Pennsylvania built before 1951 that remain in active service. These structures are 75+ years old, many predate modern engineering codes and were not designed for today's traffic volumes and vehicle weights. The average design life of a bridge is 50 years, making these aging structures a significant infrastructure concern.

Clear
Bridge State Condition Year Built Age (Years) ADT
MILL RUN Pennsylvania Fair 1950 76 50
Mountain Creek Pennsylvania Poor 1950 76 99
PA TPK (I-76) Pennsylvania Good 1950 76 530
INNERS CREEK Pennsylvania Fair 1950 76 300
Licking Creek Pennsylvania Fair 1950 76 200
Mill Creek Pennsylvania Fair 1950 76 2,000
Unknown Creek Pennsylvania Fair 1950 76 400
Unknown Creek Pennsylvania Fair 1950 76 400
Unknown Creek Pennsylvania Fair 1950 76 500
Unknown Creek Pennsylvania Fair 1950 76 300
Mill Creek Pennsylvania Fair 1950 76 250
Mill Creek Pennsylvania Fair 1950 76 400

About Historic Bridge Data

Bridges built before 1951 are classified as historic in this database. Many were designed to 1940s standards with lower load limits and narrower lanes. While FHWA requires regular inspections of all bridges regardless of age, older structures often require more frequent monitoring and rehabilitation investment.