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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
BEARCAMP RIVER New Hampshire Good 1930 96 20
STONY BROOK New Hampshire Fair 1930 96 96
BLOOD BROOK New Hampshire Good 1930 96 7,670
BROOK New Hampshire Poor 1930 96 96
LITTLE SUGAR RIVER New Hampshire Good 1930 96 96
LITTLE SUGAR RIVER New Hampshire Fair 1930 96 317
CONNECTICUT RIVER New Hampshire Poor 1930 96 —
PATCH BROOK New Hampshire Poor 1930 96 45
BAKER RIVER New Hampshire Fair 1930 96 165
POND BROOK New Hampshire Fair 1930 96 105
PARTRIDGE BROOK New Hampshire Fair 1930 96 259
MILL BROOK New Hampshire Fair 1930 96 1,044
DEAD RIVER New Hampshire Good 1931 95 4,241
FOWLER RIVER New Hampshire Fair 1931 95 1,300
NISSITISSIT RIVER New Hampshire Good 1931 95 3,553
CHANDLER BROOK New Hampshire Fair 1931 95 232
CONNECTICUT RIVER New Hampshire Fair 1931 95 1,342
GUNSTOCK RIVER New Hampshire Fair 1931 95 2,690
WILDCAT BROOK New Hampshire Fair 1931 95 1,305
ACADEMY BROOK New Hampshire Fair 1931 95 533
SOUHEGAN RIVER New Hampshire Poor 1931 95 12,799
PISCASSIC RIVER New Hampshire Good 1931 95 1,378
THOMPSON BROOK New Hampshire Poor 1931 95 5
COCHECO RIVER New Hampshire Fair 1931 95 16,489
WINNICUT RIVER New Hampshire Fair 1931 95 1,870
BLOOD BROOK New Hampshire Fair 1931 95 6,922
LOST RIVER New Hampshire Poor 1931 95 2,784
HORNE BROOK New Hampshire Fair 1932 94 1,112
NISSITISSIT RIVER New Hampshire Fair 1932 94 3,176
NORTH BRANCH RIVER New Hampshire Fair 1932 94 3,103
EXETER RIVER New Hampshire Poor 1932 94 1,854
CLAY BROOK New Hampshire Fair 1932 94 1,677
HAM BRANCH New Hampshire Fair 1932 94 360
LAFAYETTE BROOK New Hampshire Good 1932 94 593
WHITTLE BROOK New Hampshire Fair 1932 94 4,360
CLAY BROOK New Hampshire Fair 1932 94 5,075
WILD AMMONOOSUC RIVER New Hampshire Fair 1932 94 1,082
MINNEWAWA BROOK New Hampshire Fair 1932 94 491
JONES BROOK New Hampshire Good 1932 94 1,801
BEAVER BROOK New Hampshire Poor 1932 94 629
GRANITE LAKE OUTLET New Hampshire Good 1932 94 124
GRANITE LAKE OUTLET New Hampshire Fair 1932 94 490
BEECH RIVER New Hampshire Good 1932 94 1,917
LAMPREY RIVER New Hampshire Fair 1932 94 2,642
PEA BROOK New Hampshire Poor 1932 94 4,334
GRANITE LAKE OUTLET New Hampshire Good 1932 94 124
GRANITE LAKE OUTLET New Hampshire Good 1932 94 124
BRANCH RIVER New Hampshire Good 1932 94 2,529
PARTRIDGE BROOK New Hampshire Fair 1932 94 76
JOHNS RIVER New Hampshire Good 1932 94 182

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