Benton County, IA

327 public highway bridges

Benton County Bridge Snapshot

Benton County, Iowa contains 327 public highway bridges in the FHWA National Bridge Inventory. Roughly 32.1% are rated “Good,” 42.2% “Fair,” 23.5% “Poor,” and 23.5% 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.

327

Total Bridges

32.1%

Good

23.5%

Poor

23.5%

Structurally Deficient

Condition Distribution

Good

32.1% (105)

Fair

42.2% (138)

Poor

23.5% (77)

SD

23.5% (77)

All Bridges (327)

Sort:

SR 54TH ST TRL

Over: I-380

1.6 MI. S OF IOWA 150, Benton, IA

Built 1981 ADT: 18,900

I 380 NB

Over: IA 150

At Jct. Iowa 150, Benton, IA

Built 1982 ADT: 1,405

I 380 SB

Over: IA 150

At jct. Iowa 150, Benton, IA

Built 1982 ADT: 1,405

30TH AVE

Over: I-380

1.5 MILES N OF JCT IA 150, Benton, IA

Built 1984 ADT: 17,700

51 STREET

Over: I-380

2.8 mi. S of Jct. SR D48, Benton, IA

Built 1984 ADT: 17,700

IA 21

Over: US 30

IA 21 U.S. 30 INTERCHANGE, Benton, IA

US 218

Over: US 30

US 218/US 30 INTERCHANGE, Benton, IA

Built 2017 ADT: 7,700

IA 150

Over: STREAM

1.6 mi. N jct. SR E16, Benton, IA

Built 1940 Load: 13.6 t ADT: 3,330

LOCAL

Over: BR MUD CREEK

083102703, Benton, IA

Built 1972 Load: 18.3 t ADT: 15

LOCAL

Over: BR PRAIRIE CK

083112401, Benton, IA

Built 1978 Load: 18.3 t ADT: 50

LOCAL

Over: BR PRATT CK

086112602, Benton, IA

Built 1975 Load: 18.3 t ADT: 20

LOCAL

Over: BUCKEYE CK

082122210, Benton, IA

Built 1975 Load: 21.2 t ADT: 120

LOCAL

Over: BUCKEYE CREEK

082123606, Benton, IA

Built 1972 Load: 21.2 t ADT: 71

LOCAL

Over: WILD CAT CK

084090902, Benton, IA

Built 1972 Load: 21.2 t ADT: 168

LOCAL

Over: WILD CAT CREEK

084103401, Benton, IA

Built 1974 Load: 21.2 t ADT: 26

LOCAL

Over: BR HINKLE CK

085112501, Benton, IA

Built 1978 Load: 21.2 t ADT: 60

LOCAL

Over: BR BEAR CK

086101107, Benton, IA

Built 1972 Load: 21.2 t ADT: 33

LOCAL

Over: ROCK CK

086122604, Benton, IA

Built 1974 Load: 21.2 t ADT: 20

LOCAL

Over: BR CEDAR RIVER

086121203, Benton, IA

Built 1973 Load: 21.2 t ADT: 20

LOCAL

Over: BR MUD CK

084111502, Benton, IA

Built 1972 Load: 22.1 t ADT: 26

LOCAL

Over: SPRING CK

086111502, Benton, IA

Built 1974 Load: 22.1 t ADT: 40

FM

Over: LITTLE BEAR CREEK

083090403, Benton, IA

Built 1974 Load: 22.3 t ADT: 79

LOCAL

Over: PRATT CK

085110502, Benton, IA

Built 1976 Load: 22.3 t ADT: 60

LOCAL

Over: PRATT CK

086112702, Benton, IA

Built 1977 Load: 22.3 t ADT: 30

V66 21 AVE

Over: COOK CREEK

082113508, Benton, IA

Built 1957 Load: 24.5 t ADT: 1,230

LOCAL (LWC)

Over: PRAIRIE CREEK

083110701, Benton, IA

Built 1986 Load: 25.0 t ADT: 5

FM

Over: SMALL

085090403, Benton, IA

Built 1978 Load: 25.0 t ADT: 157

FM

Over: PRAIRIE CREEK

083111601, Benton, IA

Built 1966 Load: 25.2 t ADT: 1,090

LOCAL (LWC)

Over: PRATT CREEK

085122601, Benton, IA

Built 1995 Load: 25.5 t ADT: 11

LOCAL

Over: LITTLE BEAR CREEK

083101301, Benton, IA

Built 1984 Load: 26.5 t ADT: 44

LOCAL

Over: BRANCH PRAIRIE CREEK

083112602, Benton, IA

Built 1984 Load: 26.5 t ADT: 26

LOCAL

Over: MUD CREEK

084112304, Benton, IA

Built 1985 Load: 26.5 t ADT: 26

LOCAL

Over: STREAM

083090702, Benton, IA

Built 1977 Load: 26.6 t ADT: 39

LOCAL

Over: BR PRAIRIE CK

083110702, Benton, IA

Built 1985 Load: 26.6 t ADT: 26

LOCAL

Over: STREAM

083111901, Benton, IA

Built 2002 Load: 26.8 t ADT: 11

LOCAL (LWC)

Over: PRAIRIE CREEK

083113001, Benton, IA

Built 1986 Load: 27.1 t ADT: 45

FM

Over: WOLF CREEK

086120203, Benton, IA

Built 1967 Load: 27.1 t ADT: 100

LOCAL

Over: PRAIRIE CREEK

086090703, Benton, IA

Built 1996 Load: 28.2 t ADT: 20

LOCAL (LWC)

Over: BR PRAIRIE CK

083122403, Benton, IA

Built 1979 Load: 29.2 t ADT: 40

FM

Over: PRATT CREEK

085110401, Benton, IA

Built 1982 Load: 29.2 t ADT: 25

LOCAL

Over: SMALL STREAM

084100401, Benton, IA

Built 1991 Load: 29.6 t ADT: 11

FM

Over: WILDCAT CREEK

084091701, Benton, IA

Built 1987 Load: 29.8 t ADT: 1,100

FM

Over: ROCK CREEK

086110503, Benton, IA

Built 1987 Load: 29.8 t ADT: 70

LOCAL

Over: DRY CREEK

083091201, Benton, IA

Built 1984 Load: 30.0 t ADT: 44

LOCAL

Over: HINKLE CREEK

085101902, Benton, IA

Built 1984 Load: 30.0 t ADT: 71

LOCAL

Over: HINKLE CREEK

085112703, Benton, IA

Built 1973 Load: 30.0 t ADT: 34

LOCAL

Over: PRAIRIE CK

083111902, Benton, IA

Built 1975 Load: 30.2 t ADT: 15

LOCAL

Over: LITTLE BEAR CREEK

084093401, Benton, IA

Built 1985 Load: 30.2 t ADT: 49

LOCAL

Over: WILDCAT CREEK

084103402, Benton, IA

Built 1984 Load: 30.2 t ADT: 20

LOCAL

Over: PRATT CREEK

086113301, Benton, IA

Built 1984 Load: 30.2 t ADT: 20

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 5, 2026