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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
RYE CREEK Idaho Fair 1949 77 50
MOOSE CREEK Idaho Fair 1949 77 40
DEATH CREEK Idaho Fair 1949 77 100
COLD SPRINGS CREEK Idaho Fair 1949 77 100
SALMON RIVER Idaho Fair 1949 77 140
NORTH FORK BOISE RIVER Idaho Fair 1949 77 59
ANDERSON RANCH DAM SPWY Idaho Good 1950 76 100
A-1 CANAL Idaho Fair 1950 76 2,600
G CANAL Idaho Fair 1950 76 3,200
COCOLALLA CREEK Idaho Fair 1950 76 11,500
CALDWELL HIGHLINE CANAL Idaho Fair 1950 76 8,900
PRICHARD CR;PRICHARD TRS Idaho Fair 1950 76 460
IDAHO CANAL Idaho Fair 1950 76 5,100
LEWISVILLE CANAL Idaho Fair 1950 76 2,000
FARMERS FRIEND CANAL Idaho Fair 1950 76 2,300
PARADISE CREEK Idaho Good 1950 76 1,500
TREGO DITCH Idaho Fair 1950 76 2,100
SALMON RIVER Idaho Fair 1950 76 30
CAMAS CREEK Idaho Poor 1950 76 30
BILLINGSLEY CREEK Idaho Fair 1950 76 50
R CANAL Idaho Fair 1950 76 350
STRATTON CANAL Idaho Fair 1950 76 50
EAST MAIN CANAL Idaho Poor 1950 76 50
WALDVOGEL CANAL Idaho Fair 1950 76 200
RIDENBAUGH CANAL Idaho Fair 1950 76 2,200
HORNET CREEK Idaho Fair 1950 76 100
WEISER RIVER Idaho Fair 1950 76 40
DEER FLAT LOW LINE CANAL Idaho Fair 1950 76 280
GOLDEN GATE CANAL Idaho Fair 1950 76 280
DEER FLAT CANAL Idaho Fair 1950 76 370
ENTERPRISE CANAL Idaho Poor 1950 76 950
BLACK CANYON CANAL Idaho Fair 1950 76 360
FARMERS COOP CANAL Idaho Fair 1950 76 170
LITTLE WILLOW CREEK Idaho Fair 1950 76 30
FARMERS COOP CANAL Idaho Fair 1950 76 80
DEER CREEK Idaho Fair 1950 76 90
S.FK.CLEARWATER RIVER Idaho Fair 1950 76 50
WHITEBIRD CREEK Idaho Fair 1950 76 140
LAWYER CREEK;SW.KAMIAH B Idaho Fair 1950 76 130
LITTLE HANGMAN CREEK Idaho Good 1950 76 30
LAKE CREEK Idaho Fair 1950 76 10
BUTTE ARM CANAL Idaho Fair 1950 76 360
EAGLE ROCK CANAL Idaho Fair 1950 76 560
FARMERS FRIEND CANAL Idaho Fair 1950 76 560
ENTERPRIZE CANAL Idaho Fair 1950 76 560
LEMHI RIVER Idaho Fair 1950 76 70
SEVEN SUCKERS DITCH Idaho Fair 1950 76 50
N.F. CDA RIVER Idaho Poor 1950 76 50
N.F. CDA RIVER Idaho Fair 1950 76 50
OROGRANDE CREEK Idaho Fair 1950 76 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