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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
LITTLE HARBOR New Hampshire Poor 1942 84 3,359
PAWTUCKAWAY RIVER New Hampshire Fair 1942 84 3,075
CONTOOCOOK RIVER New Hampshire Poor 1942 84 5,773
SUNCOOK RIVER New Hampshire Fair 1942 84 4,409
MINNEWAWA BROOK New Hampshire Fair 1943 83 110
NEWFOUND RIVER New Hampshire Fair 1944 82 3,318
GREAT BROOK New Hampshire Good 1944 82 2,671
SACO RIVER New Hampshire Fair 1945 81 12,188
ASHUELOT RIVER New Hampshire Fair 1945 81 24
GUNNISON BROOK New Hampshire Fair 1945 81 1,012
MASCOMA RIVER CSX New Hampshire Good 1945 81 13,685
HUPPE BROOK New Hampshire Fair 1945 81 10,801
BUMPUS BROOK New Hampshire Fair 1945 81 87
SALMON FALLS RIVER New Hampshire Fair 1945 81 13,084
BAKER BROOK New Hampshire Fair 1945 81 96
NISSITISSIT RIVER New Hampshire Fair 1946 80 959
INDIAN RIVER New Hampshire Good 1946 80 1,088
MINK BROOK New Hampshire Fair 1946 80 96
RECREATION TRAIL(RR BED) New Hampshire Good 1946 80 186
PISCASSIC RIVER New Hampshire Fair 1946 80 2,525
ISINGLASS RIVER New Hampshire Good 1947 79 1,264
NISSITISSIT RIVER New Hampshire Fair 1947 79 5,547
BICKNELL BROOK New Hampshire Fair 1947 79 96
MAPLE ST NHRR New Hampshire Good 1947 79 17,943
S BR PISCATAQUOG RIVER New Hampshire Fair 1947 79 4,887
PISCASSIC RIVER New Hampshire Fair 1947 79 2,386
JACOBS BROOK New Hampshire Fair 1947 79 256
CONNECTICUT RIVER New Hampshire Fair 1947 79 1,124
BAKER RIVER New Hampshire Fair 1947 79 1,732
STEVENS BROOK New Hampshire Good 1947 79 96
ASHUELOT RIVER New Hampshire Poor 1947 79 25
UPPER AMMONOOSUC RIVER New Hampshire Fair 1947 79 50
BURNT MILL BROOK New Hampshire Fair 1947 79 50
BLUE BROOK New Hampshire Fair 1947 79 50
SUNCOOK RIVER New Hampshire Fair 1948 78 427
WARNER RIVER New Hampshire Fair 1948 78 4,002
INDIAN RIVER New Hampshire Poor 1948 78 1,436
JOHNS RIVER New Hampshire Fair 1948 78 210
FRESH CREEK New Hampshire Fair 1948 78 5,853
MILL BROOK New Hampshire Fair 1948 78 1,707
PINE BEND BROOK New Hampshire Good 1948 78 5,352
NORTHEAST POND New Hampshire Poor 1948 78 96
LAMPREY RIVER New Hampshire Fair 1948 78 2,826
STINSON BROOK New Hampshire Good 1948 78 857
NHRR(ABD) New Hampshire Fair 1948 78 8,130
JOHNSON BROOK New Hampshire Good 1948 78 222
MILL BROOK New Hampshire Fair 1948 78 6,478
NEWFOUND RIVER New Hampshire Good 1949 77 103
NEWFOUND RIVER New Hampshire Poor 1949 77 2,878
CSX New Hampshire Fair 1949 77 45,555

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