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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
NUBANUSIT BROOK New Hampshire Fair 1940 86 214
CONTOOCOOK RIVER New Hampshire Good 1940 86 6,119
OTTER BROOK New Hampshire Good 1940 86 168
BLOW-ME-DOWN BROOK New Hampshire Good 1940 86 96
BLOODS BROOK New Hampshire Fair 1940 86 96
HODGSON BROOK New Hampshire Poor 1940 86 480
HODGSON BROOK New Hampshire Good 1940 86 16,307
HODGSON BROOK New Hampshire Poor 1940 86 1,096
NORTH MILL POND New Hampshire Poor 1940 86 5,829
CSX(ABD) New Hampshire Fair 1940 86 7,092
MILL CREEK New Hampshire Poor 1940 86 639
PHILLIPS BROOK New Hampshire Poor 1940 86 96
CHRISTINE LAKE OUTLET New Hampshire Good 1940 86 96
ASHUELOT RIVER New Hampshire Fair 1940 86 829
KEZAR LAKE OUTLET New Hampshire Fair 1940 86 364
MILL BROOK New Hampshire Good 1940 86 96
BROOK New Hampshire Fair 1940 86 153
MELVIN RIVER New Hampshire Fair 1940 86 244
BRANCH RIVER New Hampshire Poor 1940 86 96
PISCATAQUOG RIVER New Hampshire Good 1940 86 96
PISCATAQUOG RIVER New Hampshire Fair 1940 86 3,359
PISCATAQUOG RIVER New Hampshire Poor 1940 86 1,866
PISCATAQUOG RIVER New Hampshire Good 1940 86 641
POND BROOK New Hampshire Fair 1940 86 96
MARTINS BROOK New Hampshire Poor 1940 86 219
BROOK New Hampshire Good 1940 86 146
MIREY BROOK New Hampshire Fair 1940 86 8,914
GORDON POND BROOK New Hampshire Fair 1940 86 2,448
PISCATAQUA RIV BACK CHNL New Hampshire Fair 1941 85 4,000
SQUAM RIVER New Hampshire Fair 1941 85 796
SQUAM RIVER New Hampshire Good 1941 85 510
CRYSTAL LAKE BROOK New Hampshire Good 1941 85 7,633
SMITH RIVER New Hampshire Good 1941 85 276
OUTLET LOON POND New Hampshire Good 1941 85 2,854
EXETER RIVER New Hampshire Poor 1941 85 234
GUNSTOCK RIVER New Hampshire Poor 1941 85 2,690
NHRR(ABD) New Hampshire Good 1941 85 1,858
STOCKER BROOK New Hampshire Good 1941 85 1,542
WHITEFACE RIVER New Hampshire Fair 1941 85 254
S BRANCH ASHUELOT RIVER New Hampshire Good 1941 85 8,976
S BRANCH ASHUELOT RIVER New Hampshire Poor 1941 85 8,976
BLACKWATER RIVER New Hampshire Poor 1941 85 1,472
MILL BROOK New Hampshire Poor 1941 85 6,478
MILL BROOK New Hampshire Fair 1941 85 6,478
WHITE BRIDGE BROOK New Hampshire Fair 1941 85 6,478
LOST RIVER New Hampshire Fair 1941 85 469
BK BAY LA WINNIPESAUKEE New Hampshire Fair 1942 84 6,310
INDIAN RIVER New Hampshire Fair 1942 84 2,636
SUCKER BROOK New Hampshire Fair 1942 84 370
HANCOCK BROOK New Hampshire Fair 1942 84 3,107

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