Clay County, IA

138 public highway bridges

Clay County Bridge Snapshot

Clay County, Iowa contains 138 public highway bridges in the FHWA National Bridge Inventory. Roughly 35.5% are rated “Good,” 54.3% “Fair,” 10.1% “Poor,” and 10.1% 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.

138
Total Bridges
35.5%
Good
10.1%
Poor
10.1%
Structurally Deficient

Condition Distribution

Good
35.5% (49)
Fair
54.3% (75)
Poor
10.1% (14)
SD
10.1% (14)

All Bridges (138)

290TH ST

Good

Over: MEADOW CREEK

097361301, Clay, IA

Built 2002 Load: 36.3 t ADT: 35

400TH ST

Good

Over: STREAM

095361101, Clay, IA

Built 2014 Load: 36.6 t ADT: 5

300TH ST

Good

Over: LITTLE SIOUX RIVER

097372001, Clay, IA

Built 1996 Load: 37.2 t ADT: 11

345TH ST

Good

Over: STREAM

096381203, Clay, IA

Built 2002 Load: 37.3 t ADT: 15

320TH AVE

Good

Over: STREAM

097351102, Clay, IA

Built 2007 Load: 37.6 t ADT: 21

FM 190TH AVE

Good

Over: LITTLE SIOUX RIVER

097372702, Clay, IA

Built 1992 Load: 37.6 t ADT: 50

N18 340TH AVE

Good

Over: LOST ISLAND LAKE

096350105, Clay, IA

Built 2021 Load: 37.9 t ADT: 838

FM 440TH ST

Good

Over: WILLOW CREEK

095373101, Clay, IA

Built 2009 Load: 38.6 t ADT: 399

150TH AVE

Good

Over: STONEY CREEK

097381302, Clay, IA

Built 1994 Load: 38.6 t ADT: 81

FM 160TH AVE

Good

Over: STONY CREEK

097373002, Clay, IA

Built 1990 Load: 38.8 t ADT: 34

N18 330TH AVE

Good

Over: POOL-MUD LAKE

097352502, Clay, IA

Built 2018 Load: 38.9 t ADT: 350

310TH ST

Good

Over: LITTLE SIOUX RIVER

097372802, Clay, IA

Built 1986 Load: 39.2 t ADT: 81

310TH ST

Good

Over: STONY CREEK

097382501, Clay, IA

Built 2020 Load: 39.5 t ADT: 26

1ST ST SOUTH

Good

Over: PICKERAL RUN

86351803, Clay, IA

Built 2021 Load: 39.5 t ADT: 171

300TH ST

Good

Over: STONEY CREEK

097382401, Clay, IA

Built 2005 Load: 39.9 t ADT: 26

430TH ST

Good

Over: WILLOW CREEK

095382601, Clay, IA

Built 2020 Load: 41.1 t ADT: 15

340TH ST

Good

Over: OCHEYEDAN RIVER

096380505, Clay, IA

Built 2008 Load: 41.8 t ADT: 30

300TH ST

Good

Over: OCHEYDAN RIVER

097381901, Clay, IA

Built 2015 Load: 42.1 t ADT: 21

330TH ST

Good

Over: BIG MEADOW CREEK

096360301, Clay, IA

Built 1990 Load: 45.4 t ADT: 81

LOCAL RD

Good

Over: SMALL

097362102, Clay, IA

Built 2003 Load: 45.4 t ADT: 112

270TH AVE

Good

Over: MONTGOMERY CREEK

094361302, Clay, IA

Built 1993 Load: 45.7 t ADT: 26

340TH ST

Good

Over: PICKEREL RUN

096350701, Clay, IA

Built 1991 Load: 45.7 t ADT: 46

260TH AVE

Good

Over: BIG MEADOW CREEK

097363502, Clay, IA

Built 2000 Load: 45.7 t ADT: 30

200 AVE

Good

Over: OCHEYEDAN RIVER

096371502, Clay, IA

Built 2012 Load: 46.3 t ADT: 2,273

290TH ST

Poor

Over: STREAM

097351505, Clay, IA

Built 1913 Load: 15.6 t ADT: 5

110TH AVE

Poor

Over: WILLOW CREEK

095380502, Clay, IA

Built 1928 Load: 24.6 t ADT: 30

105TH AVE

Poor

Over: HENRY CREEK

094381804, Clay, IA

Built 1965 Load: 24.7 t ADT: 41

FM 310TH AVE

Poor

Over: DITCH NO.60

096352202, Clay, IA

Built 1967 Load: 26.6 t ADT: 259

FM 350TH ST

Poor

Over: SPRING CREEK

096381403, Clay, IA

Built 1963 Load: 26.6 t ADT: 1,806

FM 300TH ST

Poor

Over: BIG MUDDY CREEK

097362301, Clay, IA

Built 1963 Load: 29.7 t ADT: 369

FM 130TH AVE

Poor

Over: OCHEYEDAN RIVER

096381002, Clay, IA

Built 1971 Load: 31.8 t ADT: 1,287

FM 160TH AVE

Poor

Over: WILLOW CREEK

095373002, Clay, IA

Built 1962 Load: 32.1 t ADT: 190

FM 340TH ST

Poor

Over: LITTLE SIOUX RIVER

096371103, Clay, IA

Built 1963 Load: 33.7 t ADT: 2,573

FM 280TH AVE

Poor

Over: PICKERAL RUN

096351902, Clay, IA

Built 1993 Load: 52.9 t ADT: 459

280TH AVE

Structurally Deficient

Over: ELK CREEK

095353004, Clay, IA

Built 1917 ADT: 11

210TH AVE

Structurally Deficient

Over: LITTLE SIOUX RIVER

096370102, Clay, IA

Built 1915 ADT: 62

470TH ST

Structurally Deficient

Over: LITTLE SIOUX RIVER

094360906, Clay, IA

Built 1907 Load: 5.6 t ADT: 26

355TH ST

Structurally Deficient

Over: LITTLE SIOUX RIVER

096371106, Clay, IA

Built 1905 Load: 6.5 t ADT: 41

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