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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
DODGE BROOK New Hampshire Good 1933 93 105
BLACKWATER RIVER New Hampshire Fair 1933 93 2,172
BLACKWATER RIVER New Hampshire Poor 1933 93 2,652
BLOW-ME-DOWN BROOK New Hampshire Fair 1933 93 2,052
HAM BRANCH New Hampshire Fair 1933 93 836
EXETER RIVER New Hampshire Good 1933 93 4,675
CONTOOCOOK RIVER New Hampshire Poor 1933 93 712
ELLIS RIVER New Hampshire Good 1933 93 3,464
OTTER BROOK New Hampshire Poor 1933 93 11,538
NHRR New Hampshire Good 1933 93 8,744
PAUGUS BAY New Hampshire Fair 1933 93 8,744
LAMPREY RIVER New Hampshire Fair 1933 93 1,470
BABOOSIC BROOK New Hampshire Poor 1933 93 13,024
BAGLEY BROOK New Hampshire Fair 1933 93 1,291
FARRAR POND New Hampshire Fair 1933 93 609
PEMIGEWASSET RIVER New Hampshire Poor 1933 93 6,210
MERRYMEETING RIVER New Hampshire Poor 1934 92 10,346
BLACKWATER RIVER New Hampshire Fair 1934 92 173
ELBOW BROOK New Hampshire Fair 1934 92 2,944
ISINGLASS RIVER New Hampshire Good 1934 92 5,938
TIOGA RIVER New Hampshire Good 1934 92 10,766
CONTOOCOOK RIVER New Hampshire Fair 1934 92 1,693
CONNOR BROOK New Hampshire Fair 1934 92 961
BEEBE RIVER New Hampshire Fair 1934 92 1,051
MOHAWK RIVER New Hampshire Fair 1934 92 2,935
BLACK BROOK New Hampshire Fair 1934 92 1,793
SOKOKIS BROOK New Hampshire Fair 1934 92 102
LITTLE RIVER New Hampshire Fair 1934 92 2,520
EXETER RIVER New Hampshire Fair 1934 92 13,290
STOCKER POND OUTLET New Hampshire Good 1934 92 715
GILES BROOK New Hampshire Fair 1934 92 1,745
CONNECTICUT RIVER New Hampshire Poor 1934 92 1,508
BEAVER BROOK New Hampshire Good 1934 92 9,150
SOUCOOK RIVER New Hampshire Poor 1934 92 372
S BRANCH ISRAEL RIVER New Hampshire Fair 1934 92 96
BLOODS BROOK New Hampshire Fair 1934 92 2,707
BROCK BROOK New Hampshire Good 1935 91 96
RAZOR BROOK New Hampshire Good 1935 91 318
VILLAGE BROOK New Hampshire Fair 1935 91 4,273
RED WATER BROOK New Hampshire Fair 1935 91 96
MOHAWK RIVER New Hampshire Poor 1935 91 451
CROYDON BRANCH SUGAR R New Hampshire Good 1935 91 3,532
BEAVER BROOK New Hampshire Fair 1935 91 762
BEAVER BROOK New Hampshire Good 1935 91 511
STANLEY BROOK New Hampshire Fair 1935 91 235
LAMPREY RIVER New Hampshire Fair 1935 91 4,960
EXETER RIVER New Hampshire Fair 1935 91 4,920
SQUAMSCOTT RIVER New Hampshire Good 1935 91 1,568
SQUAMSCOTT RIVER New Hampshire Good 1935 91 1,568
ASHUELOT RIVER New Hampshire Fair 1935 91 3,308

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