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Historic Bridges in Iowa

3,036 bridges built before 1951 in Iowa still in service today.

Bridges Built Before 1951

The United States has 3,036 bridges in Iowa 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
HOCKETT CREEK Iowa Fair 1900 126 21
SMALL STREAM Iowa Fair 1900 126 11
MOSQUITO CREEK Iowa Poor 1900 126 21
CREEK Iowa Poor 1900 126 21
ELK CREEK Iowa Poor 1900 126 40
SAND CREEK Iowa Poor 1900 126 11
SMALL STREAM Iowa Fair 1900 126 88
KNOTTY CREEK Iowa Fair 1900 126 26
STREAM Iowa Good 1900 126 91
PRAIRIE CREEK Iowa Poor 1900 126 11
SMALL STREAM Iowa Fair 1900 126 40
CREEK Iowa Fair 1900 126 49
CREEK Iowa Fair 1900 126 70
CREEK Iowa Fair 1900 126 5
WINNEBAGO RIVER Iowa Poor 1900 126 59
WINNEBAGO RIVER Iowa Fair 1900 126 697
LITTLE CEDAR Iowa Poor 1900 126 26
FLOOD CREEK Iowa Poor 1900 126 49
CREEK Iowa Fair 1900 126 39
WALNUT CREEK Iowa Poor 1900 126 21
BRUSH CREEK Iowa Poor 1900 126 41
BUTTRICKS CREEK Iowa Poor 1900 126 10
BLACK HAWK CREEK Iowa Fair 1900 126 354
BEAR CREEK Iowa Fair 1900 126 59
CREEK Iowa Poor 1900 126 373
TIPTON CREEK Iowa Poor 1900 126 20
SOUTH FORK IOWA RIVER Iowa Poor 1900 126 44
TIPTON CREEK Iowa Poor 1900 126 334
TIPTON CREEK Iowa Fair 1900 126 25
DD Iowa Poor 1900 126 41
KEG CREEK Iowa Poor 1900 126 11
HARRIS GROVE CREEK Iowa Fair 1900 126 379
HONEY CREEK Iowa Fair 1900 126 5
BOYER RIVER Iowa Poor 1900 126 123
HOG CREEK Iowa Fair 1900 126 71
WILLOW RIVER Iowa Poor 1900 126 89
SMALL CREEK Iowa Poor 1900 126 50
STRAW CREEK Iowa Fair 1900 126 26
CREEK Iowa Fair 1900 126 40
CREEK Iowa Fair 1900 126 11
DD Iowa Fair 1900 126 20
DD Iowa Fair 1900 126 100
CREEK Iowa Fair 1900 126 15
PRAIRIE CREEK Iowa Poor 1900 126 15
DD Iowa Fair 1900 126 15
DD Iowa Poor 1900 126 11
SOLDIER RIVER Iowa Poor 1900 126 11
CREEK Iowa Poor 1900 126 26
STREAM Iowa Poor 1900 126 21
UNNAMED CREEK Iowa Poor 1900 126 369

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