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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
CATSBANE BROOK New Hampshire Good 1937 89 11,100
MILL BROOK New Hampshire Good 1937 89 2,087
AMMONOOSUC RIVER New Hampshire Fair 1937 89 1,793
NHRR(ABD) New Hampshire Fair 1937 89 2,503
S BR BAKER RIVER New Hampshire Good 1937 89 50
CSX ROAD New Hampshire Fair 1937 89 2,056
PISCATAQUOG RIVER New Hampshire Fair 1937 89 6,880
SOUHEGAN RIVER New Hampshire Fair 1937 89 2,721
CONTOOCOOK RIVER New Hampshire Fair 1937 89 2,818
OLIVERIAN BROOK New Hampshire Fair 1937 89 2,334
CONTOOCOOK RIVER New Hampshire Fair 1937 89 531
GREAT BROOK New Hampshire Fair 1937 89 464
CONTOOCOOK RIVER New Hampshire Fair 1937 89 7,405
MILL TAIL RACE New Hampshire Fair 1937 89 7,405
PEMIGEWASSET RIVER New Hampshire Fair 1937 89 3,301
CONNECTICUT RIVER New Hampshire Poor 1937 89 2,160
CONNECTICUT RIVER New Hampshire Fair 1937 89 992
S BR PISCATAQUOG RIVER New Hampshire Fair 1937 89 3,777
S BR PISCATAQUOG RIVER New Hampshire Fair 1937 89 1,201
ANDREW BROOK New Hampshire Fair 1937 89 4,837
CONNECTICUT RIVER New Hampshire Fair 1937 89 3,625
NUBANUSIT BROOK New Hampshire Good 1937 89 1,369
STINSON BROOK New Hampshire Good 1937 89 938
EXETER RIVER New Hampshire Good 1937 89 3,762
CHOCORUA RIVER New Hampshire Fair 1937 89 6,635
WARNER RIVER New Hampshire Poor 1937 89 1,581
BLACKWATER RIVER New Hampshire Good 1937 89 96
S BRANCH BAKER RIVER New Hampshire Good 1937 89 96
BAKER RIVER New Hampshire Fair 1937 89 3,418
PARTRIDGE BROOK New Hampshire Poor 1937 89 1,167
BLOOD BROOK New Hampshire Fair 1937 89 4,387
CHARLES BROOK New Hampshire Fair 1938 88 232
LAMPREY RIVER New Hampshire Good 1938 88 5,028
SOUHEGAN RIVER New Hampshire Poor 1938 88 1,866
AMEY BROOK New Hampshire Good 1938 88 1,984
ELLIS RIVER New Hampshire Good 1938 88 6,773
CONTOOCOOK RIVER New Hampshire Fair 1938 88 12,068
MINNEWAWA RIVER New Hampshire Fair 1938 88 1,019
MASCOMA RIVER New Hampshire Fair 1938 88 186
E BR PEMIGEWASSET RIVER New Hampshire Fair 1938 88 3,107
HANCOCK BROOK New Hampshire Fair 1938 88 3,107
S BR PISCATAQUOG RIVER New Hampshire Fair 1938 88 620
JACOBS BROOK New Hampshire Fair 1938 88 1,375
DAM SPILLWAY New Hampshire Poor 1938 88 96
COLD BROOK New Hampshire Fair 1938 88 5,048
JOHNS RIVER New Hampshire Fair 1938 88 9,718
PISCATAQUOG RIVER New Hampshire Good 1939 87 96
PISCATAQUOG RIVER New Hampshire Good 1939 87 1,482
MOOSE RIVER New Hampshire Good 1939 87 10,406
MOOSE BROOK New Hampshire Good 1939 87 1,254

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