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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
WILDHORSE RIVER Idaho Poor 1908 118 30
POTLATCH RVR(SPERRY BR) Idaho Fair 1908 118 170
ST. JOE RIVER Idaho Fair 1908 118 40
BIG DICK CREEK Idaho Poor 1909 117 370
SQUAW CREEK Idaho Fair 1909 117 370
WEISER RIVER Idaho Poor 1910 116 180
ELK CREEK TRESTLE Idaho Poor 1912 114 100
BIG CREEK TRESTLE Idaho Poor 1912 114 100
AGATHA CREEK TRESTLE Idaho Poor 1912 114 100
BLACK PRINCE TRESTLE Idaho Poor 1912 114 100
JACOT CREEK Idaho Fair 1912 114 40
MERCURY CREEK Idaho Fair 1912 114 40
BOND CREEK Idaho Fair 1912 114 40
SLOUGH BRIDGE Idaho Poor 1912 114 15
TROUT CREEK Idaho Poor 1912 114 15
NORTH FORK PAYETTE RIVER Idaho Fair 1913 113 100
LITTLE WOOD RIVER Idaho Poor 1913 113 200
SHAFER CREEK Idaho Poor 1914 112 20
CLOVER CREEK Idaho Fair 1915 111 50
HIGH LINE CANAL Idaho Fair 1915 111 20
PARADISE CREEK Idaho Fair 1915 111 2,600
PARADISE CREEK Idaho Fair 1916 110 7,500
BEAR RIVER Idaho Fair 1916 110 50
WEISER RIVER Idaho Poor 1917 109 490
LAWYERS CREEK;PARK BR Idaho Poor 1917 109 50
NEW YORK CANAL Idaho Fair 1919 107 660
MOON GULCH;NE.KELLOGG BR Idaho Fair 1919 107 50
LATERAL 10 Idaho Fair 1920 106 2,900
ST. CHARLES CR N. BRIDGE Idaho Fair 1920 106 50
E. FK. WOOD RIVER Idaho Fair 1920 106 40
CAMAS CREEK Idaho Poor 1920 106 30
LITTLE WOOD RIVER Idaho Poor 1920 106 200
PAYETTE RIVER;GARDENA BR Idaho Fair 1920 106 350
SLATE CREEK Idaho Fair 1920 106 50
LONG HOLLOW CREEK Idaho Fair 1920 106 70
POTLATCH R(ARROW JCT BR) Idaho Poor 1920 106 90
BIG CANYON CREEK Idaho Fair 1920 106 50
E.BRANCH BIG LOST RIVER Idaho Fair 1920 106 40
E.BRANCH BIG LOST RIVER Idaho Fair 1920 106 260
E.FK. OF S.FK.SALMON RVR Idaho Fair 1920 106 30
SALMON FALLS CREEK Idaho Fair 1921 105 30
BEAVER CREEK Idaho Fair 1922 104 30
BOISE RIVER & CANAL Idaho Poor 1922 104 2,100
E.FK.JARBIDGE RIVER Idaho Fair 1922 104 25
GIBSON LATERAL CANAL Idaho Poor 1923 103 3,800
WEISER RIVER Idaho Fair 1923 103 30
LITTLE SALMON RIVER Idaho Poor 1923 103 20
SLIPPY CREEK Idaho Fair 1923 103 40
LITTLE WOOD RIVER Idaho Fair 1924 102 8,100
TYHEE WASTEWAY CANAL Idaho Fair 1925 101 4,600

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