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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
BROOK New Hampshire Poor 1920 106 250
MOHAWK RIVER New Hampshire Good 1920 106 96
CSX New Hampshire Good 1920 106 208
SOUTH RIVER New Hampshire Poor 1920 106 96
HAM BRANCH New Hampshire Poor 1920 106 436
CONNECTICUT RIVER New Hampshire Poor 1920 106 8,535
CONNECTICUT RIVER New Hampshire Poor 1920 106 8,535
MOUNTAIN BROOK New Hampshire Fair 1920 106 628
CHERRY MILL BROOK New Hampshire Fair 1920 106 96
SALMON HOLE BROOK New Hampshire Fair 1920 106 161
SHAKER BROOK New Hampshire Good 1920 106 300
STONY BROOK New Hampshire Good 1920 106 96
SALMON FALLS RIVER New Hampshire Fair 1920 106 557
S BR PISCATAQUOG RIVER New Hampshire Fair 1920 106 96
PRESCOTT BROOK New Hampshire Good 1920 106 96
CSX New Hampshire Poor 1920 106 438
CSX New Hampshire Fair 1920 106 2,029
BEAVER BROOK New Hampshire Fair 1920 106 6,622
BLOODS BROOK New Hampshire Fair 1920 106 96
COCHECO RIVER New Hampshire Good 1920 106 1,290
POWWOW RIVER New Hampshire Poor 1920 106 208
GRANITE LAKE INLET New Hampshire Fair 1920 106 96
SUGAR RIVER New Hampshire Fair 1920 106 505
SUGAR RIVER New Hampshire Fair 1920 106 2,301
OTTER POND OUTLET New Hampshire Fair 1920 106 125
SWIFT RIVER New Hampshire Fair 1920 106 96
GREAT EAST LAKE OUTLET New Hampshire Good 1920 106 665
ASHUELOT RIVER New Hampshire Fair 1920 106 65
BEARDS BROOK New Hampshire Fair 1920 106 96
BURTON POND OUTLET New Hampshire Poor 1920 106 36
BURTON POND OUTLET New Hampshire Fair 1920 106 96
MIREY BROOK New Hampshire Fair 1920 106 96
SOUHEGAN RIVER New Hampshire Fair 1921 105 13,075
DANIEL STREET New Hampshire Good 1921 105 14,207
PISCATAQUA RIVER New Hampshire Good 1921 105 9,471
MELVIN RIVER New Hampshire Fair 1921 105 2,151
ASHUELOT RIVER New Hampshire Fair 1921 105 2,195
MONADNOCK MILL CANAL New Hampshire Poor 1922 104 2,233
WINNIPESAUKEE RIVER New Hampshire Fair 1922 104 12,980
COLD BROOK New Hampshire Poor 1922 104 253
MILL BROOK New Hampshire Fair 1922 104 118
MINNEWAWA BROOK New Hampshire Fair 1922 104 178
WILLEY BROOK New Hampshire Fair 1922 104 2,283
WEST ALTON BROOK New Hampshire Fair 1923 103 5,130
LAMPREY RIVER New Hampshire Fair 1923 103 1,630
I-293 NH 3A CSX MERR R New Hampshire Fair 1923 103 22,640
ISINGLASS RIVER New Hampshire Fair 1923 103 2,212
SUGAR RIVER New Hampshire Fair 1923 103 1,110
SUNCOOK RIVER New Hampshire Fair 1924 102 73
NEWFOUND RIVER New Hampshire Poor 1924 102 5,690

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