Bridge Safety in Idaho

4,646 bridges, 250 Poor condition, avg age 45 years.

Bridge Inventory

Total Bridges4,646
Good Condition1,468
Fair Condition2,928
Poor Condition250
Oldest BridgeBuilt 1908
Average Age45 years

Condition Summary

% Good31.6%
% Fair63.0%
% Poor5.4%

Highest-Traffic Poor Condition Bridges in Idaho

Poor condition bridges sorted by daily traffic, the most urgent safety concerns.

Bridge Condition Year Built ADT Length
PEDESTRIAN/BIKE PATH Poor 1971 31,250 -
SAND CREEK Poor 1994 27,500 -
CITY ST;UPRR;CALDWELL OP Poor 1956 19,500 -
IDAHO CANAL Poor 1984 18,000 -
I15B;UPRR;S.BLACKFOOT IC Poor 1961 13,750 -
I15B;UPRR;S.BLACKFOOT IC Poor 1961 13,750 -
ROCK CREEK Poor 1959 11,500 -
MAIN STREET GS Poor 1962 7,750 -
MAIN STREET GS Poor 1962 7,750 -
I 15B;W.INKOM IC Poor 1962 7,750 -
SALMON RIVER;SALMON BR. Poor 1926 7,300 -
BLACKFOOT RIVER Poor 1936 7,000 -
NEW YORK CANAL Poor 1964 7,000 -
SNAKE RIVER Poor 1936 6,900 -
BOISE RIVER(BARBER BR) Poor 1954 6,700 -
RIDENBAUGH CANAL Poor 1954 6,700 -
PARADISE CREEK Poor 1992 6,400 -
ROCK CREEK Poor 1973 6,000 -
SPRING CREEK Poor 1975 5,600 -
OLD INDIAN CREEK CHANNEL Poor 1966 5,400 -

Oldest Bridges in Idaho

Bridge Condition Year Built Age ADT
WILDHORSE RIVER Poor 1908 118 yrs 30
POTLATCH RVR(SPERRY BR) Fair 1908 118 yrs 170
ST. JOE RIVER Fair 1908 118 yrs 40
BIG DICK CREEK Poor 1909 117 yrs 370
SQUAW CREEK Fair 1909 117 yrs 370
WEISER RIVER Poor 1910 116 yrs 180
ELK CREEK TRESTLE Poor 1912 114 yrs 100
BIG CREEK TRESTLE Poor 1912 114 yrs 100
AGATHA CREEK TRESTLE Poor 1912 114 yrs 100
BLACK PRINCE TRESTLE Poor 1912 114 yrs 100

Bridge Safety in Idaho

Bridge condition data for Idaho comes from the FHWA National Bridge Inventory. All publicly accessible bridges with a span over 20 feet are inspected at least every 24 months by certified bridge inspectors.