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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
RIVERSIDE CANAL Idaho Fair 1930 96 2,100
FARMERS COOP CANAL Idaho Fair 1930 96 200
GRAND VIEW IRRG.DIST.CNL Idaho Fair 1930 96 65
SUCCOR CREEK Idaho Poor 1930 96 90
VINSON WASH Idaho Poor 1930 96 60
BEAVER CREEK Idaho Fair 1930 96 220
TENNISON CREEK Idaho Fair 1930 96 50
GALLOWAY CANAL Idaho Fair 1930 96 50
COW CREEK Idaho Fair 1930 96 130
COW CREEK Idaho Fair 1930 96 130
BIG CANYON CREEK Idaho Fair 1930 96 190
STC 5752;N.FK.CDA RIVER Idaho Poor 1930 96 1,200
BIG LOST RIVER Idaho Fair 1930 96 30
SALMON RIVER;SE.CLAYTON Idaho Poor 1930 96 60
SALMON RIVER;BAYHORSE CR Idaho Fair 1930 96 170
LEMHI RIVER Idaho Fair 1930 96 60
BELLEVUE CANAL Idaho Fair 1931 95 7,000
CARMEN CREEK Idaho Fair 1931 95 2,100
TOWER CREEK Idaho Fair 1931 95 2,100
BOISE RIVER Idaho Fair 1931 95 16,500
BEAR RIVER Idaho Fair 1931 95 70
WILLOW CREEK (WHITE BR) Idaho Fair 1931 95 30
BUTTE MARKET LAKE CANAL Idaho Fair 1931 95 30
BOISE RIVER Idaho Fair 1932 94 5,500
CEDAR DRAW Idaho Fair 1932 94 2,700
RICHFIELD CANAL Idaho Poor 1932 94 10
S.GOODING MAIN CANAL Idaho Fair 1932 94 800
COW CREEK;LAGOON BR Idaho Fair 1932 94 30
N. BRANCH FALL RIVER CNL Idaho Poor 1932 94 10
FALL RIVER OVERFLOW Idaho Poor 1932 94 10
L CANAL Idaho Fair 1933 93 1,200
UPRR;N.FK.PAYETTE RIVER Idaho Poor 1933 93 4,100
ROUND VALLEY CREEK Idaho Fair 1933 93 4,100
CLEAR CREEK Idaho Good 1933 93 4,100
BIG CREEK Idaho Fair 1933 93 4,100
GOODING MAIN CANAL Idaho Fair 1933 93 20
INDIAN CREEK Idaho Poor 1933 93 2,000
DRY CREEK Idaho Poor 1934 92 2,900
YANKEE FK OF SALMON RIVR Idaho Poor 1934 92 680
M CANAL Idaho Fair 1934 92 5
U CANAL Idaho Poor 1934 92 5
R CANAL Idaho Fair 1934 92 5
WOLF LODGE CREEK Idaho Poor 1934 92 150
PINE CREEK Idaho Fair 1934 92 30
PLEASANT VALLEY CREEK Idaho Fair 1934 92 50
S.FK. CLEARWATER RIVER Idaho Fair 1934 92 10
SOUTH FORK SALMON RIVER Idaho Poor 1934 92 10
ST JOE RIVER Idaho Poor 1934 92 50
SELWAY RIVER Idaho Poor 1934 92 50
GEDNEY CR Idaho Fair 1934 92 50

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