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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
BURGESS CANAL Idaho Fair 1940 86 3,800
Little Wood River Idaho Fair 1940 86 25
CAMAS CREEK Idaho Fair 1940 86 5
KELLY CREEK Idaho Fair 1940 86 30
GARDEN CREEK Idaho Fair 1941 85 2,300
SECESH RIVER Idaho Fair 1941 85 40
E.FK. OF S.FK.SALMON RVR Idaho Fair 1941 85 40
GROUSE CREEK Idaho Poor 1941 85 870
B-4 CANAL Idaho Fair 1941 85 2,400
PACK RIVER Idaho Poor 1941 85 870
ANDERSON CANAL Idaho Fair 1941 85 1,700
PLACER CREEK Idaho Fair 1942 84 2,800
BUTTE ARM CANAL Idaho Fair 1943 83 4,900
MILNER GOODING CANAL Idaho Fair 1944 82 100
PORTNEUF RIVER Idaho Fair 1945 81 100
CAMAS CREEK Idaho Fair 1945 81 20
BIG WOOD RIVER Idaho Poor 1945 81 10
BISSEL CREEK Idaho Fair 1945 81 140
WILLOW CREEK Idaho Fair 1945 81 170
CASCADE DAM SPILLWAY Idaho Fair 1947 79 100
MASON DRAIN DITCH Idaho Fair 1947 79 14,500
FIFTEEN MILE CREEK Idaho Fair 1947 79 15,500
HIGH LINE CANAL Idaho Good 1947 79 16,000
COTTONWOOD CREEK Idaho Fair 1947 79 850
MISSION CREEK Idaho Fair 1947 79 180
RIDENBAUGH CANAL Idaho Fair 1947 79 20,000
GRAYS LAKE OUTLET Idaho Fair 1947 79 10
MALAD RIVER GORGE Idaho Fair 1947 79 80
GRIMES CREEK Idaho Fair 1947 79 25
LITTLE BEAR CREEK Idaho Fair 1948 78 3,400
S.FK.PAYETTE R;LOWMAN BR Idaho Fair 1948 78 410
BIG CANYON CREEK Idaho Fair 1948 78 30
PORTNEUF R;NW.INKOM BR Idaho Fair 1948 78 100
INDIAN CREEK Idaho Fair 1948 78 20
LEMHI RIVER Idaho Poor 1948 78 310
BURNT CABIN CR Idaho Fair 1948 78 50
LONG CREEK Idaho Fair 1948 78 50
SEVEN MILE CREEK Idaho Fair 1949 77 970
N. FK. LAKE FK. CREEK Idaho Fair 1949 77 40
N. FK. LAKE FK. CREEK Idaho Fair 1949 77 40
SWEETWATER CREEK Idaho Fair 1949 77 2,000
CHAMPION CREEK Idaho Fair 1949 77 220
TAYLOR CANAL Idaho Fair 1949 77 1,700
ANDERSON CANAL Idaho Fair 1949 77 360
TYHEE LATERAL CANAL Idaho Good 1949 77 1,400
KUNA CANAL Idaho Fair 1949 77 620
HORNET CREEK Idaho Poor 1949 77 100
S.FK.COEUR DALENE RIVER Idaho Fair 1949 77 1,400
HARRISON CANAL Idaho Fair 1949 77 520
SNAKE CR Idaho Good 1949 77 40

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