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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
CROSSCUT CANAL Idaho Fair 1937 89 20
CROSSCUT CANAL Idaho Fair 1937 89 120
NF CLEARWATER RIVER Idaho Fair 1937 89 20
PINE CREEK Idaho Fair 1938 88 2,700
REXBURG CANAL Idaho Fair 1938 88 20,000
PAHSIMEROI RIVER Idaho Fair 1938 88 1,100
LITTLE VALLEY CREEK Idaho Fair 1938 88 50
COYOTE CREEK Idaho Fair 1938 88 40
UNION FLAT CREEK Idaho Fair 1938 88 40
TEXAS SLOUGH Idaho Fair 1938 88 120
DEEP CR Idaho Fair 1938 88 10
FRAZIER CREEK Idaho Fair 1938 88 50
FISHHOOK CREEK Idaho Fair 1938 88 50
SQ___ CREEK Idaho Fair 1938 88 50
US 12;SNAKE RIVER Idaho Fair 1939 87 21,000
CLEAR CREEK;AT LOWMAN Idaho Fair 1939 87 1,200
TETON ISLAND CANAL Idaho Fair 1939 87 4,100
THORN CREEK Idaho Fair 1939 87 2,300
ROCK CREEK Idaho Fair 1939 87 80
FARMERS COOP SEBREE CNL Idaho Fair 1939 87 50
N.FK.EAST RIVER Idaho Poor 1939 87 30
PARKS LEWISVILLE CANAL Idaho Fair 1939 87 3,500
CAMAS CREEK Idaho Fair 1939 87 5
BIG CREEK Idaho Poor 1939 87 50
BIG CREEK Idaho Fair 1939 87 50
S.FK.CDA R;I-90B ARCH Idaho Poor 1940 86 2,300
CANYON CREEK Idaho Fair 1940 86 10,500
RIVERSIDE CANAL Idaho Fair 1940 86 2,500
S.FK.SALMON RIVER Idaho Poor 1940 86 40
PORTNEUF RIVER Idaho Fair 1940 86 1,100
SUNBEAM CREEK Idaho Good 1940 86 80
LITTLE WOOD RIVER Idaho Fair 1940 86 35
LITTLE WOOD RIVER Idaho Fair 1940 86 30
MILNER GOODING CANAL Idaho Poor 1940 86 50
MILNER GOODING CANAL Idaho Poor 1940 86 50
CEDAR DRAW Idaho Fair 1940 86 1,200
FIVE MILE CREEK Idaho Good 1940 86 3,100
FIVE MILE CREEK Idaho Fair 1940 86 3,100
INDIAN CREEK Idaho Fair 1940 86 7,800
FARMERS COOP CANAL Idaho Fair 1940 86 1,300
LOWER PAYETTE CANAL Idaho Fair 1940 86 150
BIG BEAR CREEK Idaho Fair 1940 86 30
PALOUSE R;NW.POTLATCH BR Idaho Fair 1940 86 220
DEEP CREEK Idaho Fair 1940 86 10
MIDDLE POTLATCH CREEK Idaho Fair 1940 86 30
LITTLE POTLATCH CREEK Idaho Fair 1940 86 110
COUGAR CREEK Idaho Fair 1940 86 10
GREAT WESTERN CANAL Idaho Fair 1940 86 680
SWAUGER SLOUGH Idaho Fair 1940 86 1,220
INDEPENDENT CANAL Idaho Fair 1940 86 80

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