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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
AMMONOOSUC R NHRR(ABD) New Hampshire Fair 1832 194 96
ASHUELOT RIVER New Hampshire Fair 1832 194 2,191
ASHUELOT RIVER New Hampshire Fair 1837 189 618
WARNER RIVER New Hampshire Fair 1840 186 428
CROYDON BRANCH SUGAR R New Hampshire Fair 1845 181 545
WILD AMMONOOSUC RIVER New Hampshire Fair 1849 177 529
MAPLE FALLS BROOK New Hampshire Poor 1850 176 208
CONTOOCOOK RIVER New Hampshire Fair 1853 173 558
WARNER RIVER New Hampshire Fair 1853 173 100
W BR WARNER RIVER New Hampshire Good 1854 172 96
SWIFT RIVER New Hampshire Good 1858 168 292
ASHUELOT RIVER New Hampshire Good 1859 167 4,250
PERRY STREAM New Hampshire Poor 1860 166 191
ISRAEL RIVER New Hampshire Fair 1862 164 750
UPPER AMMONOOSUC RIVER New Hampshire Good 1862 164 379
ASHUELOT RIVER New Hampshire Fair 1862 164 792
ASHUELOT RIVER New Hampshire Fair 1863 163 1,167
ASHUELOT RIVER New Hampshire Good 1864 162 821
CONNECTICUT RIVER New Hampshire Poor 1866 160 2,722
PEMIGEWASSET RIVER New Hampshire Fair 1869 157 1,584
COLD RIVER New Hampshire Poor 1869 157 164
SOUTH BROOK New Hampshire Fair 1869 157 500
ELLIS RIVER New Hampshire Fair 1876 150 2,280
BEEBE RIVER New Hampshire Fair 1877 149 96
BLOW-ME-DOWN BROOK New Hampshire Fair 1877 149 19
BLOODS BROOK New Hampshire Fair 1880 146 137
BLACKWATER RIVER New Hampshire Poor 1882 144 96
MILL BROOK New Hampshire Fair 1883 143 92
COCHECO RIVER New Hampshire Fair 1883 143 14,115
CLAY BROOK New Hampshire Fair 1885 141 154
PEMIGEWASSET RIVER New Hampshire Fair 1886 140 50
SACO RIVER New Hampshire Fair 1890 136 2,490
CSX New Hampshire Poor 1890 136 8,749
SALMON BROOK New Hampshire Fair 1892 134 9,118
CONTOOCOOK RIVER New Hampshire Fair 1893 133 4,507
CONNECTICUT RIVER New Hampshire Fair 1893 133 303
PISCATAQUOG RIVER New Hampshire Good 1894 132 12,740
CLAY BROOK New Hampshire Poor 1900 126 96
CONNECTICUT RIVER New Hampshire Fair 1900 126 6,519
RED WATER BROOK New Hampshire Good 1900 126 505
ARTIST FALLS BROOK New Hampshire Good 1900 126 13,702
WILD AMMONOOSUC RIVER New Hampshire Poor 1900 126 52
SUCKER BROOK New Hampshire Good 1900 126 258
BROWN BROOK New Hampshire Good 1900 126 258
CSX New Hampshire Fair 1900 126 782
MAD RIVER New Hampshire Fair 1900 126 871
GUNSTOCK RIVER New Hampshire Good 1900 126 886
GEORGES BROOK New Hampshire Good 1900 126 1,167
BEARDS BROOK New Hampshire Poor 1900 126 96
BEARDS BROOK New Hampshire Fair 1900 126 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