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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
AMEY BROOK New Hampshire Fair 1935 91 951
CONTOOCOOK RIVER New Hampshire Fair 1935 91 6,971
GREAT BROOK New Hampshire Fair 1935 91 2,671
COHAS BROOK New Hampshire Fair 1935 91 9,918
LYMAN BROOK New Hampshire Fair 1935 91 5,629
CSX New Hampshire Poor 1935 91 15,436
BEAVER BROOK New Hampshire Good 1935 91 4,824
COLD RIVER New Hampshire Good 1935 91 487
MILL BROOK New Hampshire Fair 1935 91 1,610
ASHUELOT RIVER New Hampshire Fair 1935 91 494
DEER MEADOW BROOK New Hampshire Fair 1935 91 569
CASCADE BROOK New Hampshire Good 1935 91 329
SMITH RIVER New Hampshire Good 1935 91 8,809
ZEALAND RIVER New Hampshire Fair 1935 91 50
JOE ENGLISH BROOK New Hampshire Fair 1936 90 19,233
SUCKER BROOK New Hampshire Poor 1936 90 96
MASCOMA RIVER New Hampshire Good 1936 90 705
SOUCOOK RIVER New Hampshire Fair 1936 90 8,465
SMITH RIVER New Hampshire Fair 1936 90 511
CSX PEDESTRIAN New Hampshire Fair 1936 90 7,773
OSSIPEE RIVER New Hampshire Fair 1936 90 192
LAMPREY RIVER New Hampshire Fair 1936 90 4,039
DUDLEY BROOK New Hampshire Fair 1936 90 1,663
POOR FARM BROOK New Hampshire Fair 1936 90 5,276
STOCKER BROOK New Hampshire Fair 1936 90 6,896
NHRR(ABD) New Hampshire Fair 1936 90 11,581
CSX(ABD) New Hampshire Poor 1936 90 14,314
MINK BROOK New Hampshire Fair 1936 90 —
KILBURN BROOK New Hampshire Fair 1936 90 1,643
CHERRY MILL BROOK New Hampshire Good 1936 90 519
GREAT BROOK New Hampshire Poor 1936 90 107
ASHUELOT RIVER New Hampshire Fair 1936 90 1,167
ANDREW BROOK New Hampshire Fair 1936 90 330
CSX New Hampshire Fair 1936 90 16,562
WEST BR SOUHEGAN RIVER New Hampshire Fair 1936 90 1,299
CSX New Hampshire Fair 1936 90 16,562
NUBANUSIT BROOK New Hampshire Fair 1936 90 7,812
EASTMAN BROOK New Hampshire Good 1936 90 451
STINSON BROOK New Hampshire Good 1936 90 418
S BR ASHUELOT RIVER New Hampshire Fair 1936 90 1,100
GULF BROOK New Hampshire Fair 1936 90 23,105
MILL TAIL RACE New Hampshire Fair 1936 90 96
MELVIN RIVER New Hampshire Good 1936 90 98
WARNER RIVER New Hampshire Fair 1936 90 3,778
WARNER RIVER New Hampshire Fair 1936 90 3,778
PARTRIDGE BROOK New Hampshire Fair 1936 90 10
SMITH RIVER New Hampshire Fair 1937 89 130
PEMIGEWASSET RIVER NHRR New Hampshire Fair 1937 89 2,666
COHAS BROOK New Hampshire Fair 1937 89 5,769
BEAN BROOK New Hampshire Fair 1937 89 3,103

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