Lyon County, IA

241 public highway bridges

Lyon County Bridge Snapshot

Lyon County, Iowa contains 241 public highway bridges in the FHWA National Bridge Inventory. Roughly 41.1% are rated “Good,” 37.8% “Fair,” 21.2% “Poor,” and 21.2% 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.

241
Total Bridges
41.1%
Good
21.2%
Poor
21.2%
Structurally Deficient

Condition Distribution

Good
41.1% (99)
Fair
37.8% (91)
Poor
21.2% (51)
SD
21.2% (51)

All Bridges (241)

FM

Fair

Over: ARGO SLOUGH

099431002, Lyon, IA

Built 1980 Load: 29.3 t ADT: 45

LOCAL ROAD

Fair

Over: SPRING CREEK

099461701, Lyon, IA

Built 1981 Load: 29.3 t ADT: 30

US 18

Fair

Over: DRY RUN CREEK

0.7 mi. W of SR A50, Lyon, IA

Built 1975 Load: 29.6 t ADT: 2,240

IBEX AVE

Fair

Over: LITTLE ROCK RIVER

098451202, Lyon, IA

Built 1978 Load: 29.8 t ADT: 46

LOCAL ROAD

Fair

Over: GILBERTSON CREEK

099471902, Lyon, IA

Built 1975 Load: 30.0 t ADT: 81

FM

Fair

Over: OVERFLOW

098433402, Lyon, IA

Built 1968 Load: 30.6 t ADT: 199

LOCAL ROAD

Fair

Over: TOM CREEK

100442402, Lyon, IA

Built 1969 Load: 30.6 t ADT: 15

FM

Fair

Over: ROCK RIVER

100452003, Lyon, IA

Built 1980 Load: 30.7 t ADT: 180

LOCAL ROAD

Fair

Over: TOM CREEK

100453602, Lyon, IA

Built 1974 Load: 30.7 t ADT: 15

FM

Fair

Over: SPRING CREEK

099461002, Lyon, IA

Built 1971 Load: 31.0 t ADT: 71

FM

Fair

Over: EMERY CREEK

099441502, Lyon, IA

Built 1970 Load: 31.6 t ADT: 45

IA 9

Fair

Over: MUD CREEK

0.2 mi. W of Jct. SR K30, Lyon, IA

Built 1975 Load: 31.7 t ADT: 3,270

FM

Fair

Over: SMALL STREAM

100431901, Lyon, IA

Built 1978 Load: 31.7 t ADT: 60

FM

Fair

Over: TOM CREEK

100432201, Lyon, IA

Built 1977 Load: 31.7 t ADT: 60

K60(INDIAN AVE)

Fair

Over: LITTLE ROCK RIVER

098440702, Lyon, IA

Built 1960 Load: 32.4 t ADT: 230

LOCAL ROAD

Fair

Over: CREEK

100431601, Lyon, IA

Built 2003 Load: 32.4 t ADT: 21

LOCAL

Fair

Over: STREAM

098443302, Lyon, IA

Built 1981 Load: 32.7 t ADT: 41

FM

Fair

Over: SMALL STREAM

098452101, Lyon, IA

Built 1978 Load: 32.7 t ADT: 50

FM

Fair

Over: LIZARD CREEK

098463302, Lyon, IA

Built 1975 Load: 32.7 t ADT: 1,416

LOCAL

Fair

Over: PLUM CREEK

098481003, Lyon, IA

Built 1979 Load: 32.7 t ADT: 41

LOCAL

Fair

Over: PLUM CREEK

098481101, Lyon, IA

Built 1979 Load: 32.7 t ADT: 62

FM

Fair

Over: SMALL STREAM

099431901, Lyon, IA

Built 1975 Load: 32.7 t ADT: 190

FM

Fair

Over: SMALL STREAM

099461902, Lyon, IA

Built 2005 Load: 32.7 t ADT: 240

LOCAL ROAD

Fair

Over: PETERSON CREEK

099481701, Lyon, IA

Built 1991 Load: 32.7 t ADT: 15

LOCAL RD

Fair

Over: MUD CREEK

100472403, Lyon, IA

Built 1979 Load: 33.1 t ADT: 50

FM

Fair

Over: BLOOD RUN CREEK

100482204, Lyon, IA

Built 1971 Load: 33.1 t ADT: 350

FM

Fair

Over: TOM CREEK

100432002, Lyon, IA

Built 1972 Load: 33.4 t ADT: 90

FM

Fair

Over: TOOLE CREEK

100461901, Lyon, IA

Built 1979 Load: 33.4 t ADT: 45

170TH ST

Fair

Over: ARGO SLOUGH

99431601, Lyon, IA

Built 2017 Load: 33.6 t ADT: 11

JEFFERSON ST

Fair

Over: MCLAREN CREEK

098471800, Lyon, IA

Built 1968 Load: 33.8 t ADT: 201

FM

Fair

Over: TURNER CREEK

100442201, Lyon, IA

Built 1980 Load: 34.9 t ADT: 71

IA 9

Fair

Over: ROCK RIVER

0.5 mi. E of E Jct. US 75, Lyon, IA

Built 1974 Load: 36.6 t ADT: 3,920

FM

Fair

Over: TAFT CREEK

099433302, Lyon, IA

Built 1967 Load: 37.7 t ADT: 100

FM

Fair

Over: HESS CREEK

099433302, Lyon, IA

Built 1967 Load: 38.3 t ADT: 100

FM

Fair

Over: SMALL STREAM

098460902, Lyon, IA

Built 1946 Load: 38.4 t ADT: 509

FM

Fair

Over: LITTLE ROCK RIVER

099432001, Lyon, IA

Built 1973 Load: 38.5 t ADT: 190

IA 182

Fair

Over: STREAM

0.2 mi N of Jct. SR A34, Lyon, IA

Built 1955 Load: 39.8 t ADT: 2,500

FM

Fair

Over: TAFT CREEK

099432402, Lyon, IA

Built 1955 Load: 41.7 t ADT: 439

IA 9

Fair

Over: STREAM

0.1 mi. E of S.R. K30, Lyon, IA

Built 1982 Load: 49.1 t ADT: 3,180

IA 9

Fair

Over: LITTLE ROCK RIVER

1.0 mi. W of SR L26, Lyon, IA

Built 1987 Load: 50.7 t ADT: 1,730

US 75

Fair

Over: LITTLE ROCK RIVER

0.4 mi. S of SR A44, Lyon, IA

Built 1975 Load: 51.9 t ADT: 2,610

IA 9

Good

Over: STREAM

0.2 mi. W of IA 182, Lyon, IA

Built 1980 Load: 21.4 t ADT: 4,840

LOCAL ROAD

Good

Over: ARGO SLOUGH

099431102, Lyon, IA

Built 1900 Load: 28.6 t ADT: 26

FM

Good

Over: RAT CREEK

098433301, Lyon, IA

Built 2008 Load: 30.8 t ADT: 50

FM

Good

Over: JOHNSON CREEK

099442702, Lyon, IA

Built 1980 Load: 31.7 t ADT: 40

A34 210TH AVE

Good

Over: WILLOW CREEK

098450601, Lyon, IA

Built 2017 Load: 32.4 t ADT: 578

A34 210TH ST

Good

Over: LITTLE ROCK RIVER

098430501, Lyon, IA

Built 2015 Load: 32.4 t ADT: 718

220TH ST

Good

Over: WEST RAT CREEK

098431101, Lyon, IA

Built 2014 Load: 32.4 t ADT: 30

LOG AVENUE

Good

Over: WEST RAT CREEK

098431102, Lyon, IA

Built 2020 Load: 32.4 t ADT: 41

LOCAL

Good

Over: ALLEN CREEK

098432002, Lyon, IA

Built 1989 Load: 32.4 t ADT: 21

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