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

Poor

Over: SMALL STREAM

099463002, Lyon, IA

Built 1972 Load: 24.5 t ADT: 240

FM

Poor

Over: NELSON CREEK

098483204, Lyon, IA

Built 1966 Load: 24.7 t ADT: 789

FM

Poor

Over: KLONDIKE CREEK

099482105, Lyon, IA

Built 1962 Load: 24.7 t ADT: 1,017

L14

Poor

Over: TURNER CREEK

100441418, Lyon, IA

Built 1964 Load: 24.7 t ADT: 509

L14

Poor

Over: DRY RUN CREEK

100442606, Lyon, IA

Built 1964 Load: 25.1 t ADT: 509

L14

Poor

Over: TOM CREEK

100442304, Lyon, IA

Built 1964 Load: 25.9 t ADT: 509

LOCAL ROAD

Poor

Over: EMERY CREEK

099443001, Lyon, IA

Built 1900 Load: 26.1 t ADT: 35

FM

Poor

Over: MUD CREEK

098460406, Lyon, IA

Built 1961 Load: 26.3 t ADT: 509

FM

Poor

Over: ROCK RIVER

098462402, Lyon, IA

Built 1966 Load: 27.1 t ADT: 977

FM

Poor

Over: ROCK RIVER

098463501, Lyon, IA

Built 1970 Load: 27.3 t ADT: 399

LOCAL ROAD

Poor

Over: RAT CREEK

098432801, Lyon, IA

Built 1900 Load: 28.8 t ADT: 21

FM

Poor

Over: RAT CREEK

098432202, Lyon, IA

Built 1966 Load: 30.4 t ADT: 199

FM

Poor

Over: LITTLE OTTER CREEK

098433402, Lyon, IA

Built 1968 Load: 30.4 t ADT: 199

FM

Poor

Over: KLONDIKE CREEK

099481502, Lyon, IA

Built 1966 Load: 30.4 t ADT: 309

FM

Poor

Over: MUD CREEK

100471301, Lyon, IA

Built 1970 Load: 30.4 t ADT: 290

FM

Poor

Over: PLUM CREEK

098480102, Lyon, IA

Built 1968 Load: 32.3 t ADT: 210

FM

Poor

Over: WEST RAT CREEK

098430102, Lyon, IA

Built 1965 Load: 33.0 t ADT: 230

FM

Poor

Over: BLOOD RUN CREEK

100481902, Lyon, IA

Built 1971 Load: 36.9 t ADT: 180

LOCAL ROAD

Structurally Deficient

Over: RAT CREEK

098432302, Lyon, IA

Built 1954 ADT: 26

LOCAL ROAD

Structurally Deficient

Over: OTTER CREEK

098433302, Lyon, IA

Built 1900 ADT: 30

LOCAL ROAD

Structurally Deficient

Over: OVER FLOW

098433302, Lyon, IA

Built 1900 ADT: 30

LOCAL ROAD

Structurally Deficient

Over: OTTER CREEK

098443502, Lyon, IA

Built 1900 ADT: 30

LOCAL ROAD

Structurally Deficient

Over: EMERY CREEK

098450102, Lyon, IA

Built 1900 ADT: 26

LOCAL ROAD

Structurally Deficient

Over: SMALL STREAM

098460701, Lyon, IA

Built 1900 ADT: 41

LOCAL

Structurally Deficient

Over: ROCK RIVER

098462303, Lyon, IA

Built 1900 ADT: 62

LOCAL ROAD

Structurally Deficient

Over: HEFFERMAN CREEK

098472802, Lyon, IA

Built 1900 ADT: 11

220TH ST

Structurally Deficient

Over: BIG SIOUX RIVER

098480804, Lyon, IA

Built 1925 ADT: 46

LOCAL ROAD

Structurally Deficient

Over: LITTLE ROCK RIVER

099430901, Lyon, IA

Built 1900 ADT: 71

LOCAL ROAD

Structurally Deficient

Over: KLONDIKE CREEK

099481201, Lyon, IA

Built 1900 ADT: 41

LOCAL ROAD

Structurally Deficient

Over: TOM CREEK

100442902, Lyon, IA

Built 1900 ADT: 15

N 2ND AVE

Structurally Deficient

Over: SMALL STREAM

100453304, Lyon, IA

Built 1900 ADT: 346

LOCAL ROAD

Structurally Deficient

Over: JOHNSON CREEK

098440502, Lyon, IA

Built 1900 Load: 2.7 t ADT: 5

LOCAL ROAD

Structurally Deficient

Over: BLOOD RUN CREEK

100482302, Lyon, IA

Built 1900 Load: 3.4 t ADT: 90

LOCAL ROAD

Structurally Deficient

Over: OVERFLOW

098433502, Lyon, IA

Built 1900 Load: 5.9 t ADT: 26

SIDE DITCH ENT

Structurally Deficient

Over: SIDE DITCH

098471002, Lyon, IA

Built 1900 Load: 5.9 t ADT: 10

LOCAL ROAD

Structurally Deficient

Over: SMALL STREAM

098482304, Lyon, IA

Built 1900 Load: 6.1 t ADT: 21

LOCAL ROAD

Structurally Deficient

Over: LITTLE ROCK RIVER

098452907, Lyon, IA

Built 1900 Load: 7.9 t ADT: 62

LOCAL ROAD

Structurally Deficient

Over: LITTLE OTTER CREEK

098433502, Lyon, IA

Built 1900 Load: 11.6 t ADT: 26

FM

Structurally Deficient

Over: KANARANZI CREEK

100452202, Lyon, IA

Built 1959 Load: 13.1 t ADT: 369

LOCAL ROAD

Structurally Deficient

Over: LIZARD CREEK

098462701, Lyon, IA

Built 1900 Load: 13.4 t ADT: 62

LOCAL ROAD

Structurally Deficient

Over: ALBERTSON CREEK

098471601, Lyon, IA

Built 1900 Load: 25.7 t ADT: 41

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

Related

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