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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
LITTLE SUNCOOK RIVER New Hampshire Fair 1924 102 2,133
BISHOP BROOK New Hampshire Good 1924 102 1,820
STRATFORD BOG BROOK New Hampshire Fair 1924 102 34
NHRR New Hampshire Fair 1924 102 1,398
RED WATER BROOK New Hampshire Fair 1925 101 211
SOUHEGAN RIVER New Hampshire Fair 1925 101 1,043
NUBANUSIT BROOK New Hampshire Fair 1925 101 489
NUBANUSIT BROOK New Hampshire Fair 1925 101 96
NASHUA RIVER New Hampshire Fair 1925 101 16,730
NORTH RIVER New Hampshire Poor 1925 101 3,719
JACOBS BROOK New Hampshire Fair 1925 101 1,116
CONTOOCOOK RIVER New Hampshire Fair 1925 101 646
CHOCORUA RIVER New Hampshire Fair 1925 101 2,159
SESSIONS BROOK New Hampshire Good 1926 100 1,529
POWWOW RIVER New Hampshire Good 1926 100 1,716
COCHECO RIVER New Hampshire Poor 1926 100 770
GUNSTOCK RIVER New Hampshire Fair 1926 100 4,557
CSX(ABD) New Hampshire Good 1926 100 11,099
MILL BROOK New Hampshire Good 1926 100 573
SOUCOOK RIVER New Hampshire Fair 1926 100 3,138
CLEAR STREAM New Hampshire Good 1926 100 981
MERRYMEETING RIVER New Hampshire Fair 1926 100 662
SMITH RIVER New Hampshire Good 1926 100 50
BOG BROOK New Hampshire Good 1927 99 823
AMMONOOSUC RIVER New Hampshire Poor 1927 99 1,167
WEST BRANCH BROOK New Hampshire Fair 1927 99 1,054
MAD RIVER New Hampshire Fair 1927 99 2,020
ASH SWAMP BROOK New Hampshire Good 1927 99 3,532
WILD AMMONOOSUC RIVER New Hampshire Fair 1927 99 882
GUNSTOCK RIVER New Hampshire Good 1927 99 672
SMALL BROOK New Hampshire Fair 1927 99 173
MILL BROOK New Hampshire Fair 1927 99 80
CSX New Hampshire Good 1927 99 4,040
CSX New Hampshire Good 1927 99 3,778
STINSON BROOK New Hampshire Fair 1927 99 857
BEARCAMP RIVER New Hampshire Good 1927 99 716
GRIDLEY RIVER New Hampshire Fair 1927 99 95
ALBANY BROOK New Hampshire Good 1928 98 2,713
E BR SACO RIVER New Hampshire Poor 1928 98 1,078
BABOOSIC BROOK New Hampshire Poor 1928 98 511
TUNNEL BROOK New Hampshire Fair 1928 98 52
AMMONOOSUC RIVER New Hampshire Fair 1928 98 178
PEMIGEWASSET RIVER New Hampshire Poor 1928 98 1,917
REEL BROOK New Hampshire Good 1928 98 360
PISCATAQUOG RIVER New Hampshire Fair 1928 98 13,570
S BRANCH SUGAR RIVER New Hampshire Good 1928 98 1,915
TEWKSBURY POND OUTLET New Hampshire Fair 1928 98 1,858
NORTH BRANCH RIVER New Hampshire Fair 1928 98 1,072
CONNECTICUT RIVER New Hampshire Fair 1928 98 7,367
MILL BROOK New Hampshire Good 1928 98 1,167

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