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:

450TH ST

Over: STREAM

094370501, Clay, IA

Built 1949 Load: 20.7 t ADT: 15

140TH AVE

Over: OCHEYEDAN RIVER

096381102, Clay, IA

Built 1963 Load: 21.7 t ADT: 153

390TH ST

Over: OVERFLOW LITTLE SIOUX R

095360201, Clay, IA

Built 1955 Load: 22.7 t ADT: 40

420TH ST

Over: ELK CREEK

095352001, Clay, IA

Built 1978 Load: 23.0 t ADT: 11

330TH ST

Over: STONY CREEK

096370603, Clay, IA

Built 1965 Load: 23.7 t ADT: 41

FM 350TH ST

Over: BIG MEADOW CREEK

096361501, Clay, IA

Built 1963 Load: 24.9 t ADT: 878

FM 300TH ST

Over: DRAINAGE DITCH

097352201, Clay, IA

Built 1963 Load: 25.2 t ADT: 469

FM 130TH AVE

Over: WILLOW CREEK

095381502, Clay, IA

Built 1964 Load: 26.0 t ADT: 619

FM 190TH AVE

Over: PRAIRIE CREEK

096373402, Clay, IA

Built 1964 Load: 26.6 t ADT: 818

FM 310TH AVE

Over: L TRUMBULL OUTLET

097352702, Clay, IA

Built 1970 Load: 26.6 t ADT: 968

FM 270TH AVE

Over: MEADOW CREEK

097361302, Clay, IA

Built 1968 Load: 26.6 t ADT: 50

US 18

Over: LITTLE SIOUX OVERFLOW

3.6 mi. E of E jct. US 71, Clay, IA

Built 1931 Load: 27.7 t ADT: 4,170

180TH AVE

Over: PRAIRIE CREEK

095370402, Clay, IA

Built 2008 Load: 27.7 t ADT: 21

FM 260TH AVE

Over: LITTLE SIOUX RIVER

095363502, Clay, IA

Built 1969 Load: 27.9 t ADT: 71

190TH AVE

Over: WILLOW CREEK

094370302, Clay, IA

Built 1978 Load: 28.6 t ADT: 72

470TH ST

Over: MONTGOMERY CREEK

094361403, Clay, IA

Built 1998 Load: 29.5 t ADT: 30

225TH ST

Over: WILLOW CREEK

094360704, Clay, IA

Built 1978 Load: 29.7 t ADT: 26

FM 150TH AVE

Over: WILLOW CREEK

095382502, Clay, IA

Built 1973 Load: 29.7 t ADT: 180

270TH ST

Over: STONY CREEK

097380301, Clay, IA

Built 1976 Load: 29.7 t ADT: 26

FM 160TH AVE

Over: OCHEYEDAN RIVER

096370702, Clay, IA

Built 1981 Load: 30.2 t ADT: 40

FM 260TH AVE

Over: OVERFLOW LITTLE SIOUX

094360202, Clay, IA

Built 1966 Load: 30.3 t ADT: 71

180TH AVE

Over: WILLOW CREEK

094370402, Clay, IA

Built 1979 Load: 30.4 t ADT: 50

FM 100TH AVE

Over: BR OCHEYEDAN R

096380602, Clay, IA

Built 1967 Load: 30.4 t ADT: 359

270TH ST

Over: BIG MEADOW CK

097350601, Clay, IA

Built 1976 Load: 30.4 t ADT: 20

340TH ST

Over: BIG MEADOW CREEK

096361001, Clay, IA

Built 1981 Load: 30.6 t ADT: 105

230TH AVE

Over: DD #28

097362902, Clay, IA

Built 1979 Load: 30.6 t ADT: 123

350TH ST

Over: OVERFLOW MEADOW CREEK

096361501, Clay, IA

Built 1976 Load: 31.1 t ADT: 878

FM 300TH ST

Over: LITTLE MEADOW CK

097362101, Clay, IA

Built 1989 Load: 31.1 t ADT: 369

310TH ST

Over: LITTLE MUDDY CREEK

097362801, Clay, IA

Built 1991 Load: 31.1 t ADT: 21

420TH ST

Over: WILLOW CREEK

095382201, Clay, IA

Built 1978 Load: 32.3 t ADT: 11

290TH AVE

Over: STREAM

096352002, Clay, IA

Built 1994 Load: 32.3 t ADT: 103

380TH ST

Over: PRAIRIE CK

096363301, Clay, IA

Built 1977 Load: 32.3 t ADT: 30

330TH ST

Over: STREAM

096380201, Clay, IA

Built 1900 Load: 32.3 t ADT: 123

FM 350TH ST

Over: DRAINAGE

096381701, Clay, IA

Built 1972 Load: 32.3 t ADT: 908

FM 100TH AVE

Over: STREAM

096381802, Clay, IA

Built 1972 Load: 32.3 t ADT: 529

310TH ST

Over: MEADOW CREEK

097362601, Clay, IA

Built 1999 Load: 32.4 t ADT: 30

240TH AVE

Over: LITTLE MEADOWS

097362802, Clay, IA

Built 1999 Load: 32.4 t ADT: 123

FM 280TH ST

Over: STONEY CREEK

097381001, Clay, IA

Built 1965 Load: 32.4 t ADT: 270

490TH ST

Over: MONTGOMERY CREEK

094353001, Clay, IA

Built 1990 Load: 32.7 t ADT: 46

190TH AVE

Over: STREAM

094371002, Clay, IA

Built 1999 Load: 32.7 t ADT: 46

225TH AVE

Over: SMALL STREAM

095360604, Clay, IA

Built 1978 Load: 32.7 t ADT: 81

FM 440TH ST

Over: SMALL

095373201, Clay, IA

Built 1988 Load: 32.7 t ADT: 469

FM 400TH ST

Over: WILLOW CREEK

095380801, Clay, IA

Built 1968 Load: 32.7 t ADT: 797

370TH ST

Over: STREAM

096352601, Clay, IA

Built 2001 Load: 32.7 t ADT: 47

US 71

Over: BR OF LITTLE MEADOW CRK

0.8 mi. N of N jct. US 18, Clay, IA

Built 1990 Load: 32.7 t ADT: 11,400

FM 320TH ST

Over: BIG MEADOW CREEK

097363501, Clay, IA

Built 1978 Load: 32.9 t ADT: 80

FM 280TH AVE

Over: PICKEREL RUN

096351704, Clay, IA

Built 1990 Load: 33.0 t ADT: 120

FM 280TH ST

Over: BIG MEADOW CREEK

097350701, Clay, IA

Built 1977 Load: 33.0 t ADT: 50

FM 320TH ST

Over: DRAINAGE DIST #37 DITCH

097353301, Clay, IA

Built 1978 Load: 33.0 t ADT: 34

FM 280TH ST

Over: LITTLE SIOUX RIVER

097370701, Clay, IA

Built 1966 Load: 33.0 t ADT: 270

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