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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
MEADOW CREEK Idaho Fair 1934 92 50
M.F.CLWATER R.;E.KOOSKIA Idaho Poor 1935 91 980
UPRR; IGO OVERPASS Idaho Fair 1935 91 623
HIGH LINE CANAL Idaho Fair 1935 91 1,000
CREEK;SLOUGH Idaho Fair 1935 91 140
FISHHOOK CREEK Idaho Fair 1935 91 330
ST JOE RIVER;AVERY BR Idaho Fair 1935 91 330
LITTLE PINE CREEK Idaho Fair 1935 91 3,600
LOW LINE CANAL Idaho Fair 1935 91 100
GRIMES CREEK Idaho Fair 1935 91 20
GOLDEN GATE CANAL Idaho Fair 1935 91 20
INDIAN CREEK Idaho Fair 1935 91 3,100
INDIAN CREEK Idaho Fair 1935 91 560
SALMON R;WHITEBIRD TRUSS Idaho Poor 1935 91 550
SHEBANG CREEK Idaho Fair 1935 91 20
COW CREEK Idaho Fair 1935 91 50
COW CREEK Idaho Fair 1935 91 30
THORN CREEK Idaho Fair 1935 91 30
LAPWAI CREEK Idaho Poor 1935 91 180
CLEARWATER R;LENORE BR. Idaho Poor 1935 91 400
ANDERSON CANAL Idaho Fair 1935 91 50
BIG LOST RIVER Idaho Fair 1935 91 210
ROBINSON CREEK Idaho Fair 1935 91 30
SIDE CHANNEL TETON RIVER Idaho Fair 1935 91 250
SELWAY RIVER Idaho Good 1935 91 10
CDA RIVER Idaho Fair 1935 91 50
ST JOE RIVER Idaho Fair 1935 91 50
ST JOE RIVER Idaho Fair 1935 91 50
SIMMONS CREEK Idaho Fair 1935 91 50
N.F. ST JOE RIVER Idaho Poor 1935 91 50
N.F. ST JOE RIVER Idaho Fair 1935 91 50
BLACKFOOT RIVER Idaho Poor 1936 90 7,000
UPRR;BICKEL OVERPASS Idaho Poor 1936 90 2,500
LOWER W.BRANCH PRIEST R. Idaho Fair 1936 90 2,100
SNAKE RIVER Idaho Poor 1936 90 6,900
LOW LINE CANAL Idaho Fair 1936 90 80
HIGH LINE CANAL Idaho Fair 1936 90 70
AMERICAN R;SE.ELK CITY B Idaho Fair 1936 90 50
LITTLE POTLATCH CREEK Idaho Fair 1936 90 110
BNRR;UPRR & DEEP CREEK Idaho Poor 1936 90 900
COEUR DALENE RIVER Idaho Poor 1936 90 680
UPRR;N.SPENCER RR OP Idaho Poor 1936 90 50
WHITE CAP CR Idaho Good 1936 90 20
BIG CREEK Idaho Fair 1936 90 50
RED IVES CREEK Idaho Good 1936 90 50
SELWAY R SWIFTWATER Idaho Fair 1936 90 50
UPPER W.BRANCH PRIEST R. Idaho Fair 1937 89 2,700
BULLION CREEK Idaho Fair 1937 89 220
SALMON RIVER;LUCILLE BR Idaho Fair 1937 89 30
CROSSCUT CANAL Idaho Poor 1937 89 10

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