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Historic Bridges in Idaho

354 bridges built before 1951 in Idaho still in service today.

Bridges Built Before 1951

The United States has 354 bridges in Idaho 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
ROSS FORK CREEK Idaho Fair 1925 101 3,800
LITTLE SALMON RIVER Idaho Fair 1925 101 50
OROFINO CREEK Idaho Fair 1925 101 70
HENRYS FK SNAKE RIVER Idaho Poor 1925 101 30
NOBLE CANAL Idaho Fair 1926 100 4,100
SALMON RIVER;SALMON BR. Idaho Poor 1926 100 7,300
CUB RIVER Idaho Poor 1926 100 310
LITTLE WOOD RIVER Idaho Fair 1926 100 800
BIG LOST RIVER Idaho Fair 1926 100 290
BIG LOST RIVER Idaho Fair 1926 100 500
BIG LOST RIVER Idaho Fair 1926 100 260
THOUSAND SPRINGS CREEK Idaho Poor 1926 100 80
LITTLE SALMON R;POLLOCK Idaho Fair 1927 99 100
SQUAW CREEK Idaho Fair 1928 98 470
MOYIE RIVER;MEADOW CREEK Idaho Fair 1928 98 120
T.F.NORTHSIDE MAIN CNL Idaho Fair 1928 98 620
E LATERAL CANAL Idaho Fair 1928 98 1,000
GREAT WESTERN CANAL Idaho Fair 1928 98 480
OSGOOD CANAL Idaho Fair 1928 98 20
MILNER GOODING CANAL Idaho Fair 1929 97 620
COTTONWOOD CREEK Idaho Fair 1929 97 20
PINE CREEK Idaho Fair 1929 97 30
SIRR & UPRR;S.ATHOL OP Idaho Poor 1929 97 540
JORDON CREEK;PLEASANT BR Idaho Fair 1930 96 50
GRAYS CREEK Idaho Fair 1930 96 160
SAND CREEK Idaho Fair 1930 96 140
DRY CREEK Idaho Poor 1930 96 30
LITTLE WOOD RIVER Idaho Poor 1930 96 20
T.F.NORTHSIDE MAIN CNL Idaho Fair 1930 96 170
T.F.NORTHSIDE MAIN CNL Idaho Fair 1930 96 170
T.F.NORTHSIDE MAIN CNL Idaho Fair 1930 96 160
GOODING MAIN CANAL Idaho Fair 1930 96 30
DRY CREEK Idaho Fair 1930 96 30
GOODING MAIN CANAL Idaho Fair 1930 96 30
CANAL Idaho Fair 1930 96 30
DRY CREEK Idaho Fair 1930 96 30
DRY CREEK Idaho Fair 1930 96 30
BIG WOOD RIVER Idaho Fair 1930 96 20
T.F.NORTHSIDE MAIN CNL Idaho Fair 1930 96 1,300
X CANAL Idaho Fair 1930 96 30
LITTLE WOOD RIVER Idaho Fair 1930 96 300
HIGH LINE CANAL Idaho Fair 1930 96 40
HIGH LINE CANAL Idaho Fair 1930 96 20
LOW LINE CANAL Idaho Fair 1930 96 140
HIGH LINE CANAL Idaho Fair 1930 96 30
FIVE MILE CREEK Idaho Fair 1930 96 6,100
W.BR.GOOSE CR;MEADOWS BR Idaho Fair 1930 96 80
LITTLE SALMON RIVER Idaho Fair 1930 96 100
WEISER RIVER Idaho Fair 1930 96 140
GRIMES CREEK Idaho Fair 1930 96 310

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