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Historic Bridges in New Hampshire

716 bridges built before 1951 in New Hampshire still in service today.

Bridges Built Before 1951

The United States has 716 bridges in New Hampshire 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
PEABODY RIVER New Hampshire Good 1950 76 441
CHICKWOLNEPY STREAM New Hampshire Good 1950 76 264
CHICKWOLNEPY STREAM New Hampshire Poor 1950 76 96
STEARNS BROOK New Hampshire Poor 1950 76 96
SALMON FALLS RIVER New Hampshire Fair 1950 76 1,881
SALMON BROOK New Hampshire Fair 1950 76 7,604
JACOBS BROOK New Hampshire Fair 1950 76 96
ROARING BROOK New Hampshire Poor 1950 76 233
BEARCAMP RIVER New Hampshire Poor 1950 76 96
WHITEFACE RIVER New Hampshire Fair 1950 76 79
GREAT BROOK New Hampshire Fair 1950 76 342
GREAT BROOK New Hampshire Fair 1950 76 121
ORE HILL BROOK New Hampshire Fair 1950 76 96
BERRY BROOK New Hampshire Good 1950 76 1,732
MAD RIVER New Hampshire Fair 1950 76 147
DOUGLAS BROOK New Hampshire Poor 1950 76 50

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.

All Bridges Poor Condition Scour Critical Bridge Stats