Clinton County, IA

325 public highway bridges

Clinton County Bridge Snapshot

Clinton County, Iowa contains 325 public highway bridges in the FHWA National Bridge Inventory. Roughly 70.5% are rated “Good,” 23.7% “Fair,” 2.2% “Poor,” and 2.2% 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.

325

Total Bridges

70.5%

Good

2.2%

Poor

2.2%

Structurally Deficient

Condition Distribution

Good

70.5% (229)

Fair

23.7% (77)

Poor

2.2% (7)

SD

2.2% (7)

All Bridges (325)

Sort:

420TH AVE.

Over: CREEK

082E63302, Clinton, IA

Built 1991 Load: 32.6 t ADT: 91

230TH ST

Over: CREEK

081E51201, Clinton, IA

Built 1952 Load: 32.7 t ADT: 82

160TH ST

Over: STREAM

082E40501, Clinton, IA

Built 1962 Load: 32.7 t ADT: 21

400TH AVE.

Over: CREEK

083E63002, Clinton, IA

Built 1958 Load: 32.7 t ADT: 40

170TH ST.

Over: DRAINAGE

082E10901, Clinton, IA

Built 1987 Load: 32.8 t ADT: 21

120TH AVE.

Over: SMALL

082E10504, Clinton, IA

Built 1989 Load: 32.8 t ADT: 21

280TH AVE

Over: DEEP CREEK

083E43004, Clinton, IA

Built 1975 Load: 33.1 t ADT: 51

EB US 30

Over: SILVER CK & UP RR

0.7 MI. E OF W JCT US 61, Clinton, IA

Built 1970 Load: 33.1 t ADT: 8,550

MILL CR. EXPWY.

Over: HARTS MILL CREEK

081061505, Clinton, IA

Built 2000 Load: 33.3 t ADT: 8,400

120TH AVE.

Over: CREEK

082E12802, Clinton, IA

Built 1920 Load: 33.7 t ADT: 21

400TH AVE.

Over: SOUTH BRANCH ELK RIVER

083E63102, Clinton, IA

Built 1989 Load: 34.4 t ADT: 80

252ND ST

Over: SILVER CREEK

081E32305, Clinton, IA

Built 1971 Load: 34.6 t ADT: 760

185TH AVENUE

Over: PRAIRIE CREEK

083E20404, Clinton, IA

Built 1973 Load: 34.6 t ADT: 840

110TH ST.

Over: PRAIRIE CREEK

083E20901, Clinton, IA

Built 1975 Load: 34.6 t ADT: 90

WB US 30

Over: AMES CREEK

3.5 MI E OF E JCT US 61, Clinton, IA

Built 1974 Load: 34.9 t ADT: 4,700

160TH ST.

Over: DD #12

082E20501, Clinton, IA

Built 1979 Load: 35.3 t ADT: 35

175TH ST

Over: DRAINAGE DITCH #12

082E21105, Clinton, IA

Built 1980 Load: 35.3 t ADT: 16

200TH AVE

Over: DRAINAGE DITCH #10

082E22302, Clinton, IA

Built 1984 Load: 35.4 t ADT: 60

190TH ST.

Over: SMALL STREAM

082E51904, Clinton, IA

Built 1976 Load: 35.5 t ADT: 26

290TH AVE

Over: SUGAR CREEK

083E40502, Clinton, IA

Built 1987 Load: 35.6 t ADT: 45

247TH AVE

Over: BARBER CREEK

081E33306, Clinton, IA

Built 1985 Load: 35.8 t ADT: 41

110TH ST.

Over: CREEK

083E31101, Clinton, IA

Built 1921 Load: 35.8 t ADT: 51

148TH ST.

Over: SMALL STREAM

083E32803, Clinton, IA

Built 1968 Load: 35.8 t ADT: 11

278TH ST

Over: DRAINAGE

080E20205, Clinton, IA

Built 1996 Load: 37.5 t ADT: 170

340TH AVENUE

Over: CREEK

082E53102, Clinton, IA

Built 1965 Load: 37.5 t ADT: 35

130TH ST

Over: CREEK

083E22301, Clinton, IA

Built 1970 Load: 37.5 t ADT: 16

140TH ST.

Over: CREEK

083E32501, Clinton, IA

Built 1967 Load: 37.5 t ADT: 21

NB US 61

Over: SILVER CREEK

0.9 MI. N OF N JCT US 30, Clinton, IA

Built 1974 Load: 37.9 t ADT: 6,350

290TH AVE

Over: AMES CREEK

081E40502, Clinton, IA

Built 1971 Load: 39.0 t ADT: 1,220

MILL CR. EXPWY.

Over: MILL CREEK

081061107, Clinton, IA

Built 2000 Load: 39.2 t ADT: 7,619

US 30

Over: DRAINAGE DITCH

1.2 mi. E of Jct. SR Y68, Clinton, IA

Built 1974 Load: 40.3 t ADT: 9,400

260TH AVE

Over: CLEAR CREEK

081E31404, Clinton, IA

Built 1995 Load: 40.9 t ADT: 570

200TH AVE

Over: SMALL

080E20204, Clinton, IA

Built 1979 Load: 42.2 t ADT: 104

215 AVE

Over: DEEP CREEK

083E23604, Clinton, IA

Built 2000 Load: 42.4 t ADT: 26

US 67

Over: SHADDUCKS CREEK

5.7 mi. N of N Jct IA 136, Clinton, IA

Built 1967 Load: 43.7 t ADT: 2,170

SB US 61

Over: SILVER CREEK

0.9 mi. N of N Jct. US 30, Clinton, IA

Built 1974 Load: 44.0 t ADT: 6,350

IA 136

Over: MILL CREEK

2.7 Mi. N of N Jct. US 67, Clinton, IA

Built 1989 Load: 45.0 t ADT: 1,430

255TH ST

Over: BARBER CREEK

081E31905, Clinton, IA

Built 1991 Load: 52.8 t ADT: 21

220TH STREET

Over: CREEK

081E40101, Clinton, IA

Built 1960 Load: 57.4 t ADT: 1,010

262ND ST

Over: WEST SILVER CREEK

081E32503, Clinton, IA

Built 1952 Load: 16.3 t ADT: 123

OLD US 61

Over: DEEP CREEK

083E33206, Clinton, IA

Built 1926 Load: 18.0 t ADT: 30

190TH STREET

Over: DRAINAGE

082E22301, Clinton, IA

Built 1958 Load: 22.7 t ADT: 490

160TH ST

Over: STREAM

082E40501, Clinton, IA

Built 1962 Load: 24.5 t ADT: 21

SB US 61

Over: SILVER CREEK

0.5 MI. S OF JCT.US 30, Clinton, IA

Built 1981 Load: 24.9 t ADT: 7,050

170TH AVE.

Over: DRAINAGE DITCH 12

082E20802, Clinton, IA

Built 1962 Load: 26.6 t ADT: 35

160TH AVE

Over: DRAINAGE DITCH #12

082E23002, Clinton, IA

Built 1980 Load: 26.6 t ADT: 41

150TH ST.

Over: DRAINAGE

083E13403, Clinton, IA

Built 1970 Load: 26.6 t ADT: 21

110TH ST.

Over: PRAIRIE CREEK

083E20805, Clinton, IA

Built 1965 Load: 26.6 t ADT: 90

432ND AVENUE

Over: SPRING CREEK

083E62704, Clinton, IA

Built 1969 Load: 26.6 t ADT: 780

150TH ST.

Over: SPRING CREEK

083E63403, Clinton, IA

Built 1976 Load: 26.6 t ADT: 15

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