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)

Sort:

290TH ST

Over: STONEY CREEK

097381401, Clay, IA

Built 2004 Load: 33.2 t ADT: 15

300TH AVE

Over: STREAM

096352102, Clay, IA

Built 1999 Load: 33.7 t ADT: 46

370TH AVE

Over: STREAM

096382501, Clay, IA

Built 2000 Load: 33.8 t ADT: 30

455TH ST

Over: MONTGOMERY CREEK

094360203, Clay, IA

Built 2002 Load: 34.0 t ADT: 62

FM 320TH AVE

Over: DD #22

094352602, Clay, IA

Built 2003 Load: 34.6 t ADT: 20

300TH AVE

Over: STREAM

097353302, Clay, IA

Built 2000 Load: 34.7 t ADT: 11

RAILWAY ST

Over: ELK CREEK

000000000, Clay, IA

Built 1996 Load: 34.7 t ADT: 884

FM 170TH AVE

Over: WILLOW CREEK

095373202, Clay, IA

Built 1963 Load: 35.0 t ADT: 219

FM 260TH AVE

Over: MONTGOMERY CREEK

094360202, Clay, IA

Built 1978 Load: 35.3 t ADT: 71

280TH ST

Over: STREAM

097351001, Clay, IA

Built 2000 Load: 35.6 t ADT: 60

250TH AVE

Over: PRAIRIE CREEK

096362702, Clay, IA

Built 1990 Load: 35.9 t ADT: 62

330TH AVE

Over: D.D#60

00000, Clay, IA

Built 2011 Load: 36.0 t ADT: 15

FM 290TH AVE

Over: PICKERAL RUN #37

097353202, Clay, IA

Built 1995 Load: 36.0 t ADT: 50

290TH ST

Over: LITTLE SIOUX RIVER

097371701, Clay, IA

Built 1978 Load: 36.0 t ADT: 30

460TH ST

Over: STREAM

094371203, Clay, IA

Built 1994 Load: 37.3 t ADT: 41

FM 390TH ST

Over: LITTLE SIOUX RIVER

095360201, Clay, IA

Built 1986 Load: 37.6 t ADT: 40

350TH ST

Over: LITTLE SIOUX RIVER

096371405, Clay, IA

Built 1976 Load: 37.6 t ADT: 2,584

FM 350TH ST

Over: OCHEYEDAN RIVER

096371803, Clay, IA

Built 1973 Load: 38.6 t ADT: 1,806

FM 240TH AVE

Over: DRAINAGE DITCH #28

097363304, Clay, IA

Built 1987 Load: 41.3 t ADT: 1,228

FM 200TH AVE

Over: WILLOW CREEK

094371102, Clay, IA

Built 1989 Load: 50.0 t ADT: 45

340TH ST

Over: STONY CREEK

096370703, Clay, IA

Built 2003 Load: 52.9 t ADT: 185

330TH ST

Over: STREAM

096380601, Clay, IA

Built 2005 Load: 52.9 t ADT: 72

110TH AVE

Over: HENRY CREEK

094380802, Clay, IA

Built 1965 Load: 95.9 t ADT: 26

250TH AVE

Over: LITTLE MUDDY CREEK

097361502, Clay, IA

Built 1996 Load: 97.2 t ADT: 72

FM 320TH ST

Over: DD #28

097363201, Clay, IA

Built 1996 Load: 97.2 t ADT: 1,228

SR M22

Over: SIDE DITCH

At jct. SR M-22, Clay, IA

Built 1959 Load: 18.1 t ADT: 10

PK 658(WANATA)

Over: LITTLE SIOUX RIVER

IN WANATA STATE PARK, Clay, IA

Built 1972 Load: 19.8 t ADT: 58

200TH AVE

Over: PRAIRIE CREEK

096373502, Clay, IA

Built 2003 Load: 26.8 t ADT: 11

390TH ST

Over: PRAIRIE CREEK

095370401, Clay, IA

Built 2008 Load: 27.7 t ADT: 50

160TH AVE

Over: SPRING CREEK

096370702, Clay, IA

Built 1981 Load: 29.7 t ADT: 40

FM 430TH ST

Over: ELK CREEK

095353001, Clay, IA

Built 2004 Load: 30.3 t ADT: 240

340TH ST

Over: LITTLE MEADOW CREEK

096360905, Clay, IA

Built 1981 Load: 30.3 t ADT: 103

140TH AVE

Over: STONY CREEK

097381102, Clay, IA

Built 1978 Load: 30.4 t ADT: 46

FM 240TH AVE

Over: LITTLE MUDDY CREEK

097363208, Clay, IA

Built 1987 Load: 31.2 t ADT: 240

US 18

Over: OCHEYEDAN RIVER

2.3 mi W of SR M-27, Clay, IA

Built 2014 Load: 32.4 t ADT: 2,990

US 71

Over: PRAIRIE CREEK

1.4 MI. N OF JCT. SR B40, Clay, IA

Built 2017 Load: 32.4 t ADT: 4,770

420TH ST

Over: STREAM

095362201, Clay, IA

Built 2005 Load: 32.4 t ADT: 46

495TH ST

Over: LITTLE SIOUX RIVER

094362803, Clay, IA

Built 2005 Load: 32.7 t ADT: 30

FM 170TH AVE

Over: SMALL WATERWAY

094370802, Clay, IA

Built 1993 Load: 32.7 t ADT: 219

FM 240TH AVE

Over: LITTLE SIOUX RIVER

096361608, Clay, IA

Built 1991 Load: 32.7 t ADT: 2,623

390TH ST

Over: WILLOW CREEK

095380601, Clay, IA

Built 2008 Load: 32.9 t ADT: 5

330TH ST

Over: LITTLE MEADOW CREEK

096360403, Clay, IA

Built 1975 Load: 32.9 t ADT: 103

120TH AVE

Over: WILLOW CREEK

00000, Clay, IA

Built 2011 Load: 33.0 t ADT: 11

400TH ST

Over: WILLOW CREEK

95381701, Clay, IA

Built 2011 Load: 33.0 t ADT: 11

460TH ST

Over: STREAM

094370801, Clay, IA

Built 2005 Load: 33.7 t ADT: 21

390TH ST

Over: PRARIE CREEK

095370201, Clay, IA

Built 2006 Load: 33.7 t ADT: 21

370TH ST

Over: STREAM

096352701, Clay, IA

Built 1998 Load: 33.7 t ADT: 41

150TH AVE

Over: STREAM

096382402, Clay, IA

Built 2000 Load: 33.8 t ADT: 62

100TH AVE

Over: WILLOW CREEK

096383102, Clay, IA

Built 1996 Load: 34.6 t ADT: 35

FM 190TH AVE

Over: OCHEYEDAN RIVER

096371502, Clay, IA

Built 2002 Load: 35.3 t ADT: 1,277

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