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)

LOCAL ROAD

Fair

Over: MUD CREEK

098462701, Lyon, IA

Built 1962 Load: 13.3 t ADT: 62

FM

Fair

Over: LITTLE ROCK RIVER

098441602, Lyon, IA

Built 1950 Load: 16.3 t ADT: 50

US 75

Fair

Over: DRAINAGE DITCH

3.8 mi. N of N Jct. IA 9, Lyon, IA

Built 1935 Load: 17.0 t ADT: 1,500

IA 9

Fair

Over: STREAM

200 ft. S of Jct. SR K12, Lyon, IA

Built 1940 Load: 18.1 t ADT: 4,520

IA 9

Fair

Over: MOON CREEK

0.3 mi. W of W jct. US 75, Lyon, IA

Built 1974 Load: 20.0 t ADT: 3,180

LOCAL ROAD

Fair

Over: MUD CREEK

098461601, Lyon, IA

Built 1900 Load: 20.0 t ADT: 49

LOCAL ROAD

Fair

Over: MUD CREEK

099462901, Lyon, IA

Built 1971 Load: 20.0 t ADT: 26

LOCAL ROAD

Fair

Over: MUD CREEK

099463201, Lyon, IA

Built 1971 Load: 20.0 t ADT: 30

IA 182

Fair

Over: STREAM

2.5 mi. S of Jct. IA 9, Lyon, IA

Built 1955 Load: 21.0 t ADT: 2,500

FM

Fair

Over: HEFFERMAN CREEK

098473402, Lyon, IA

Built 1978 Load: 21.0 t ADT: 60

LOCAL

Fair

Over: MUD CREEK

100473601, Lyon, IA

Built 1963 Load: 21.0 t ADT: 112

K14 BEECH AVE

Fair

Over: PLUM CREEK

098480306, Lyon, IA

Built 1977 Load: 21.4 t ADT: 41

LOCAL ROAD

Fair

Over: SPRING CREEK

099460902, Lyon, IA

Built 1971 Load: 22.1 t ADT: 30

LOCAL ROAD

Fair

Over: RAT CREEK

098432402, Lyon, IA

Built 1900 Load: 23.0 t ADT: 50

FM

Fair

Over: ARGO SLOUGH

099431202, Lyon, IA

Built 1977 Load: 23.4 t ADT: 789

LOCAL ROAD

Fair

Over: MOON CREEK

100463601, Lyon, IA

Built 1900 Load: 23.9 t ADT: 62

US 75

Fair

Over: ROCK RIVER

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

Built 1975 Load: 24.4 t ADT: 2,620

A50 260TH ST

Fair

Over: SMALL STREAM

098483103, Lyon, IA

Built 1968 Load: 24.5 t ADT: 888

FM

Fair

Over: DRY RUN CREEK

099440702, Lyon, IA

Built 1958 Load: 24.5 t ADT: 270

LOCAL ROAD

Fair

Over: EMERY CREEK

099442002, Lyon, IA

Built 1900 Load: 24.5 t ADT: 15

FM

Fair

Over: SMALL STREAM

100442001, Lyon, IA

Built 1978 Load: 24.5 t ADT: 71

FM

Fair

Over: ALBERTSON CREEK

0984715, Lyon, IA

Built 1973 Load: 24.6 t ADT: 100

FM

Fair

Over: LIZARD CREEK

098463301, Lyon, IA

Built 1970 Load: 24.9 t ADT: 399

FM

Fair

Over: WEST RAT CREEK

098431501, Lyon, IA

Built 1977 Load: 25.5 t ADT: 259

FM

Fair

Over: PUTNAM CREEK

098443301, Lyon, IA

Built 1977 Load: 25.5 t ADT: 649

FM

Fair

Over: LITTLE ROCK RIVER

098451404, Lyon, IA

Built 1955 Load: 25.6 t ADT: 369

FM

Fair

Over: LITTLE ROCK RIVER

098453101, Lyon, IA

Built 1954 Load: 25.6 t ADT: 709

FM

Fair

Over: TOM CREEK

100432202, Lyon, IA

Built 1980 Load: 25.7 t ADT: 60

FM

Fair

Over: EMERY CREEK

099443002, Lyon, IA

Built 1980 Load: 25.9 t ADT: 270

LOG AVE

Fair

Over: WEST RAT CREEK

098431402, Lyon, IA

Built 1900 Load: 26.1 t ADT: 34

LOCAL ROAD

Fair

Over: TAFT CREEK

099432302, Lyon, IA

Built 1900 Load: 26.1 t ADT: 30

LOCAL ROAD

Fair

Over: SMALL STREAM

100431501, Lyon, IA

Built 1900 Load: 26.1 t ADT: 15

LOCAL ROAD

Fair

Over: ALBERTSON CREEK

098472302, Lyon, IA

Built 2008 Load: 26.5 t ADT: 41

FM

Fair

Over: RAT CREEK

098431301, Lyon, IA

Built 1971 Load: 26.6 t ADT: 399

IA 9

Fair

Over: BLOODRUN CREEK

0.3 mi. E of Jct. SR K12, Lyon, IA

Built 1977 Load: 26.8 t ADT: 4,520

LOCAL

Fair

Over: LITTLE ROCK RIVER

098452202, Lyon, IA

Built 1987 Load: 26.8 t ADT: 26

FM

Fair

Over: BURR OAK CREEK

098453502, Lyon, IA

Built 1961 Load: 27.0 t ADT: 758

LOCAL ROAD

Fair

Over: LITTLE ROCK RIVER

099433201, Lyon, IA

Built 1970 Load: 27.1 t ADT: 34

A18 (140TH ST)

Fair

Over: BIG SIOUX RIVER

100493503, Lyon, IA

Built 1963 Load: 27.3 t ADT: 1,607

LOCAL ROAD

Fair

Over: WEST RAT CREEK

098432201, Lyon, IA

Built 1993 Load: 27.4 t ADT: 11

LOCAL

Fair

Over: LITTLE ROCK RIVER

098430604, Lyon, IA

Built 1982 Load: 27.6 t ADT: 143

FM

Fair

Over: TOOLE CREEK

100461902, Lyon, IA

Built 1970 Load: 27.6 t ADT: 290

LOCAL ROAD

Fair

Over: OTTER CREEK

098442800, Lyon, IA

Built 2010 Load: 27.9 t ADT: 35

US 18

Fair

Over: BIG SIOUX RIVER

at S.DAKOTA BORDER, Lyon, IA

Built 1978 Load: 28.0 t ADT: 2,130

LOCAL ROAD

Fair

Over: ALBERTSON CREEK

098472601, Lyon, IA

Built 1900 Load: 28.2 t ADT: 21

FM

Fair

Over: EMERY CREEK

098450101, Lyon, IA

Built 1977 Load: 28.7 t ADT: 818

FM

Fair

Over: LITTLE ROCK RIVER

099430302, Lyon, IA

Built 1975 Load: 28.8 t ADT: 100

A50 (BRIDGE ST)

Fair

Over: BIG SIOUX RIVER

098492519, Lyon, IA

Built 1971 Load: 29.2 t ADT: 888

LOCAL ROAD

Fair

Over: OVERFLOW

099431102, Lyon, IA

Built 1900 Load: 29.2 t ADT: 26

FM

Fair

Over: ALLEN CREEK

098443601, Lyon, IA

Built 1978 Load: 29.3 t ADT: 45

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