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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
MILL BROOK New Hampshire Fair 1928 98 113
MILL BROOK New Hampshire Fair 1928 98 177
NORTH RIVER New Hampshire Good 1928 98 2,809
PEARL LAKE BROOK New Hampshire Fair 1928 98 1,167
MILL BROOK New Hampshire Good 1928 98 1,167
NASHUA RIVER New Hampshire Fair 1928 98 14,902
BEECH RIVER New Hampshire Good 1928 98 910
BAKER RIVER New Hampshire Poor 1928 98 410
GALE RIVER New Hampshire Poor 1928 98 96
MILL POND New Hampshire Fair 1928 98 8,066
BAKER RIVER New Hampshire Fair 1928 98 21
MILL BROOK New Hampshire Fair 1928 98 6,478
STONY BROOK New Hampshire Fair 1928 98 3,863
COLD RIVER New Hampshire Fair 1929 97 105
NHRR(ABD) New Hampshire Poor 1929 97 2,674
SUCKER BROOK New Hampshire Poor 1929 97 2,674
SUCKER BROOK New Hampshire Poor 1929 97 2,674
SUNCOOK RIVER New Hampshire Fair 1929 97 3,514
CONTOOCOOK RIVER New Hampshire Fair 1929 97 2,233
BOG BROOK New Hampshire Poor 1929 97 1,193
BEAVER BROOK New Hampshire Good 1929 97 2,935
MOHAWK RIVER New Hampshire Fair 1929 97 1,600
MOHAWK RIVER New Hampshire Fair 1929 97 438
SMITH RIVER New Hampshire Poor 1929 97 2,087
STONY BROOK New Hampshire Good 1929 97 2,728
SUNCOOK RIVER New Hampshire Fair 1929 97 1,261
STOCKER BROOK New Hampshire Good 1929 97 1,542
MONAHAN BROOK New Hampshire Good 1929 97 1,167
CANAL New Hampshire Fair 1929 97 96
OYSTER RIVER New Hampshire Fair 1929 97 18,654
SHANNON BROOK New Hampshire Fair 1929 97 2,514
BRACKETT BROOK New Hampshire Poor 1929 97 826
BAKER POND BROOK New Hampshire Poor 1929 97 826
CONNECTICUT RIVER New Hampshire Fair 1929 97 2,403
CLEMENT BROOK New Hampshire Poor 1929 97 44
MARTIN BROOK New Hampshire Good 1929 97 2,956
MARTIN BROOK New Hampshire Poor 1929 97 2,956
STONY BROOK New Hampshire Poor 1929 97 3,496
COLD RIVER New Hampshire Poor 1930 96 96
MEADOW BROOK New Hampshire Poor 1930 96 108
BROCK BROOK New Hampshire Good 1930 96 96
BROCK BROOK New Hampshire Fair 1930 96 96
BROCK BROOK New Hampshire Fair 1930 96 56
FOWLER RIVER New Hampshire Fair 1930 96 173
FOWLER RIVER New Hampshire Poor 1930 96 96
COFFIN BROOK New Hampshire Good 1930 96 7,487
BLACKWATER RIVER New Hampshire Fair 1930 96 501
NHRR(ABD) New Hampshire Good 1930 96 243
REC TRAIL(RR BED) New Hampshire Fair 1930 96 96
OWL BROOK New Hampshire Fair 1930 96 96

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