Sioux County, IA

429 public highway bridges

Sioux County Bridge Snapshot

Sioux County, Iowa contains 429 public highway bridges in the FHWA National Bridge Inventory. Roughly 61.5% are rated “Good,” 34% “Fair,” 2.3% “Poor,” and 2.3% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in IA are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

429

Total Bridges

61.5%

Good

2.3%

Poor

2.3%

Structurally Deficient

Condition Distribution

Good

61.5% (264)

Fair

34% (146)

Poor

2.3% (10)

SD

2.3% (10)

All Bridges (429)

Sort:

FM

Over: DRY CREEK

096462102, Sioux, IA

Built 1967 Load: 30.4 t ADT: 1,077

L14

Over: FLOYD RIVER

095433004, Sioux, IA

Built 1969 Load: 30.5 t ADT: 578

FM

Over: FLOYD RIVER

096430103, Sioux, IA

Built 1968 Load: 30.5 t ADT: 679

LOCAL

Over: SMALL STREAM

094440602, Sioux, IA

Built 1965 Load: 30.8 t ADT: 30

FM

Over: INDIAN CREEK

094473401, Sioux, IA

Built 1984 Load: 30.8 t ADT: 90

LOCAL

Over: NO NAME CR

097461402, Sioux, IA

Built 1973 Load: 30.8 t ADT: 71

LOCAL

Over: ROGG CR

097461401, Sioux, IA

Built 1969 Load: 31.4 t ADT: 71

LOCAL

Over: SMALL STREAM

097461401, Sioux, IA

Built 1973 Load: 31.4 t ADT: 71

FM

Over: DRY CREEK

095470401, Sioux, IA

Built 1964 Load: 32.7 t ADT: 419

FM

Over: NO NAME CREEK

097463002, Sioux, IA

Built 1964 Load: 32.7 t ADT: 369

IA 10

Over: BIG SIOUX RIVER

At S Dakota St. Line, Sioux, IA

Built 1991 Load: 33.3 t ADT: 1,910

FM

Over: W FORK FLOYD RIVER

095451201, Sioux, IA

Built 1967 Load: 33.7 t ADT: 2,992

FM

Over: DRY CREEK

095471901, Sioux, IA

Built 1966 Load: 33.7 t ADT: 538

LOCAL

Over: SMALL STREAM

095463201, Sioux, IA

Built 1959 Load: 34.0 t ADT: 50

FM

Over: SMALL

095451201, Sioux, IA

Built 1900 Load: 34.0 t ADT: 2,992

FM

Over: SMALL STREAM

095431103, Sioux, IA

Built 1984 Load: 34.3 t ADT: 1,147

K64

Over: UNNAMED CREEK

095440402, Sioux, IA

Built 1900 Load: 34.7 t ADT: 1,117

BIRCH AVE

Over: BIG SIOUX RIVER

097481404, Sioux, IA

Built 1966 Load: 34.7 t ADT: 450

LOCAL

Over: SMALL

096460701, Sioux, IA

Built 1954 Load: 35.0 t ADT: 110

FM

Over: NO NAME CREEK

096433404, Sioux, IA

Built 1966 Load: 35.3 t ADT: 270

FM

Over: NO NAME CREEK

097481501, Sioux, IA

Built 1966 Load: 35.3 t ADT: 789

10TH ST

Over: BIG SIOUX RIVER

000000000, Sioux, IA

Built 1980 Load: 36.9 t ADT: 670

COUNTY RD

Over: WILLOW CREEK

095430310, Sioux, IA

Built 1991 Load: 37.7 t ADT: 1,347

IA 10

Over: STREAM

0.4 mi. W of jct. US 75, Sioux, IA

Built 1989 Load: 37.9 t ADT: 1,900

IA 10

Over: DRY CREEK

0.4 mi W of IA 12, Sioux, IA

Built 1955 Load: 38.1 t ADT: 2,800

L14

Over: SMALL STREAM

094432902, Sioux, IA

Built 1954 Load: 39.2 t ADT: 722

FM

Over: ROCK RIVER

095470603, Sioux, IA

Built 1969 Load: 39.9 t ADT: 139

LOCAL

Over: SMALL

096471804, Sioux, IA

Built 1978 Load: 42.1 t ADT: 30

FM

Over: BIG SIOUX RIVER

096471803, Sioux, IA

Built 2009 Load: 46.0 t ADT: 1,277

IA 10

Over: OVER UP RR

1.0 mi W of Ia. 60, Sioux, IA

Built 1983 Load: 48.0 t ADT: 4,260

IA 60 SB

Over: FLOYD RIVER TRIBUTARY

0.5 mi S of SR K64, Sioux, IA

Built 2003 Load: 49.4 t ADT: 3,200

CHERRY AVE

Over: SMALL STREAM

094471902, Sioux, IA

Built 2000 Load: 99.9 t ADT: 20

LOCAL

Over: SMALL STREAM

094473602, Sioux, IA

Built 1984 Load: 99.9 t ADT: 11

LOCAL

Over: SMALL STREAM

095430501, Sioux, IA

Built 1999 Load: 99.9 t ADT: 15

LOCAL

Over: SMALL

095430502, Sioux, IA

Built 1993 Load: 99.9 t ADT: 26

LOCAL

Over: SMALL STREAM

095470202, Sioux, IA

Built 1934 Load: 99.9 t ADT: 11

LOCAL

Over: STREAM

096432102, Sioux, IA

Built 1993 Load: 99.9 t ADT: 20

LOCAL

Over: NO NAME CREEK

096433301, Sioux, IA

Built 1992 Load: 99.9 t ADT: 20

360TH ST

Over: SMALL STREAM

096452101, Sioux, IA

Built 2000 Load: 99.9 t ADT: 80

LOCAL

Over: SMALL STREAM

096452202, Sioux, IA

Built 2001 Load: 99.9 t ADT: 34

LOCAL

Over: SMALL

097431702, Sioux, IA

Built 1985 Load: 99.9 t ADT: 30

B 14

Over: SMALL STREAM

097451801, Sioux, IA

Built 1990 Load: 99.9 t ADT: 26

LOCAL

Over: SM STREAM

097460702, Sioux, IA

Built 1994 Load: 99.9 t ADT: 11

FM

Over: SMALL STREAM

094433601, Sioux, IA

Built 1986 Load: 99.9 t ADT: 61

FM

Over: ORANGE CITY SLOUGH

095442101, Sioux, IA

Built 1992 Load: 99.9 t ADT: 60

LOCAL

Over: STREAM

094432202, Sioux, IA

Built 1993 Load: 99.9 t ADT: 15

LOCAL

Over: SMALL STREAM

095433402, Sioux, IA

Built 1994 Load: 99.9 t ADT: 11

LILY AVE

Over: STREAM

094431002, Sioux, IA

Built 2000 Load: 99.9 t ADT: 41

LOCAL

Over: SMALL

094432401, Sioux, IA

Built 1985 Load: 99.9 t ADT: 15

LOCAL

Over: SMALL

094473401, Sioux, IA

Built 1988 Load: 99.9 t ADT: 90

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026