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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
WAPSIPINICON RIVER Iowa Fair 1927 99 9,000
BOYLAN CREEK Iowa Fair 1927 99 1,080
DRAINAGE DITCH Iowa Poor 1927 99 1,051
STREAM Iowa Good 1927 99 1,720
BRUSH CREEK Iowa Poor 1927 99 393
BRANCH SMITH CREEK Iowa Fair 1927 99 4,430
BLOODY RUN CREEK Iowa Poor 1927 99 687
SMALL NATURAL STREAM Iowa Fair 1927 99 1,451
DRAINAGE DITCH Iowa Good 1927 99 2,420
LITTLE SIOUX RIVER Iowa Good 1927 99 1,810
KEMP CREEK Iowa Poor 1927 99 29
TRIB TO BLACK HAWK CREEK Iowa Good 1927 99 79
BEAVER DAM CREEK Iowa Poor 1927 99 21
GREY CREEK Iowa Poor 1927 99 15
BEAR CREEK Iowa Fair 1927 99 30
SLOUGH CREEK Iowa Fair 1927 99 26
STEEL CREEK Iowa Poor 1927 99 11
CLEAR WATER CREEK Iowa Poor 1927 99 33
BOONE RIVER Iowa Poor 1927 99 21
MAQUOKETA RIVER Iowa Poor 1927 99 50
BUCK CREEK Iowa Poor 1927 99 21
SLATER CREEK Iowa Poor 1927 99 70
CHERRY CREEK Iowa Poor 1927 99 30
LITTLE SNIPE CREEK Iowa Poor 1927 99 40
SNIPE CREEK Iowa Poor 1927 99 90
SPRING CREEK Iowa Fair 1927 99 97
WHISKEY CREEK Iowa Fair 1927 99 34
STREAM Iowa Poor 1927 99 90
SKUNK RIVER TRIBUTARY Iowa Fair 1927 99 91
SALT CREEK Iowa Poor 1927 99 59
BRANCH OTTER CREEK Iowa Poor 1927 99 79
SMALL STREAM Iowa Poor 1927 99 26
SMALL STREAM Iowa Poor 1927 99 45
BR ENGLISH RIVER Iowa Poor 1927 99 40
DRAINAGE DITCH 11-13 Iowa Poor 1927 99 72
MUD CREEK Iowa Poor 1927 99 2,902
PRAIRIE CREEK Iowa Fair 1928 98 15
BEAVER CREEK Iowa Fair 1928 98 2,260
STREAM Iowa Fair 1928 98 3,050
DRAINAGE DITCH Iowa Fair 1928 98 422
DICKERSONS BRANCH Iowa Fair 1928 98 1,130
STREAM Iowa Fair 1928 98 1,330
UNNAMED CREEK Iowa Fair 1928 98 3,290
STREAM Iowa Good 1928 98 1,880
STREAM Iowa Fair 1928 98 1,773
NEOLA CREEK Iowa Fair 1928 98 1,676
STREAM Iowa Fair 1928 98 3,070
SMITH CREEK Iowa Poor 1928 98 920
SILVER CREEK Iowa Poor 1928 98 187
DRAINAGE DITCH Iowa Fair 1928 98 2,200

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