Johnson County, IA

317 public highway bridges

Johnson County Bridge Snapshot

Johnson County, Iowa contains 317 public highway bridges in the FHWA National Bridge Inventory. Roughly 33.4% are rated “Good,” 45.1% “Fair,” 8.2% “Poor,” and 8.2% 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.

317

Total Bridges

33.4%

Good

8.2%

Poor

8.2%

Structurally Deficient

Condition Distribution

Good

33.4% (106)

Fair

45.1% (143)

Poor

8.2% (26)

SD

8.2% (26)

All Bridges (317)

Sort:

3RD ST

Over: SMALL STREAM

000000000, Johnson, IA

Built 1980 Load: 16.5 t ADT: 260

400TH ST

Over: WAPSINONOE CREEK

079052301, Johnson, IA

Built 1977 Load: 16.8 t ADT: 80

FM

Over: PICAYUNE CR

078072906, Johnson, IA

Built 1976 Load: 17.1 t ADT: 240

NE 340TH ST

Over: STREAM

079050201, Johnson, IA

Built 1952 Load: 17.1 t ADT: 51

FM 310TH ST

Over: STREAM

080052503, Johnson, IA

Built 1900 Load: 17.1 t ADT: 60

TAFT AVE

Over: STREAM

081051804, Johnson, IA

Built 1970 Load: 17.1 t ADT: 31

FM JOHNS-IOWA R

Over: STREAM

081080602, Johnson, IA

Built 1966 Load: 17.1 t ADT: 730

SE WHITE OAK AV

Over: BIG SLOUGH CR

078051104, Johnson, IA

Built 1920 Load: 18.0 t ADT: 35

US 6

Over: STREAM

3.1 MI. E OF JCT. SR W38, Johnson, IA

Built 1953 Load: 18.1 t ADT: 5,200

US 6

Over: PIG RUN CREEK

4.1 mi. E of Jct. SR W-38, Johnson, IA

Built 1923 Load: 18.1 t ADT: 5,200

140TH ST NE

Over: STREAM

081071603, Johnson, IA

Built 1977 Load: 18.2 t ADT: 663

SW OBSERVATORY

Over: BRANCH OF CROOKED CREEK

078062804, Johnson, IA

Built 1984 Load: 18.3 t ADT: 122

SE 660TH ST

Over: PRAIRIE CR

077052901, Johnson, IA

Built 1930 Load: 19.4 t ADT: 26

W 295TH ST

Over: BR CLEAR CR

080081903, Johnson, IA

Built 1977 Load: 19.4 t ADT: 60

140TH ST NW

Over: KNAPP CREEK

081081601, Johnson, IA

Built 1987 Load: 19.4 t ADT: 50

US 6

Over: RALSTON CREEK

0.3 MI. E OF E JCT. IA #1, Johnson, IA

Built 1957 Load: 20.9 t ADT: 27,000

FM MORSE RD

Over: RAPID CR

080050903, Johnson, IA

Built 1930 Load: 21.2 t ADT: 1,220

US 6

Over: IOWA RIVER

0.2 MI. E OF E JCT. IA 1, Johnson, IA

Built 1957 Load: 21.4 t ADT: 27,000

FM-BLACKHAWK AV

Over: CLEAR CREEK

080082904, Johnson, IA

Built 1995 Load: 21.6 t ADT: 1,200

WATER STREET NE

Over: WEST HOOSIER CREEK

0810703, Johnson, IA

Built 2010 Load: 22.3 t ADT: 49

WAPSIE RD

Over: STREAM

080052106, Johnson, IA

Built 1965 Load: 22.5 t ADT: 102

FM MAHAFFY BR R

Over: STREAM

081062806, Johnson, IA

Built 2000 Load: 23.7 t ADT: 3,730

TAFT AVE

Over: STREAM

079053202, Johnson, IA

Built 1966 Load: 24.5 t ADT: 734

MUSCATINE AVE

Over: RALSTON CK S BRANCH

079061400, Johnson, IA

Built 1972 Load: 24.5 t ADT: 9,524

SW BLACKHAWK AV

Over: MILLER CREEK

078081904, Johnson, IA

Built 2004 Load: 24.6 t ADT: 11

NB I-380

Over: IOWA RIVER

7.9 MI. N OF JCT I-80, Johnson, IA

Built 1972 Load: 24.7 t ADT: 27,200

FM SUTLIFF RD

Over: CEDAR RIVER

081051105, Johnson, IA

Built 1983 Load: 24.9 t ADT: 480

SW OBSERVTY AVE

Over: OLD MANS CREEK

078062105, Johnson, IA

Built 1980 Load: 25.1 t ADT: 290

FM SAND RD

Over: SNYDER CREEK

078060204, Johnson, IA

Built 1964 Load: 25.3 t ADT: 2,620

SB I-380

Over: IOWA RIVER

7.9 MI. N OF JCT. I-80, Johnson, IA

Built 1972 Load: 25.4 t ADT: 27,200

FM 660TH ST

Over: RICHEY CREEK

077052501, Johnson, IA

Built 1979 Load: 25.5 t ADT: 35

FM 120TH ST

Over: HOOSIER CREEK

081060509, Johnson, IA

Built 1900 Load: 26.2 t ADT: 1,500

HALFMOON AVE

Over: BUFFALO CREEK

080072908, Johnson, IA

Built 1976 Load: 26.5 t ADT: 112

FM SW NAPLES AV

Over: PICAYUNE CREEK

078062002, Johnson, IA

Built 1966 Load: 26.6 t ADT: 70

FM SW BLK DIMND

Over: N BRANCH OLD MAN'S CREEK

079073009, Johnson, IA

Built 1968 Load: 26.6 t ADT: 650

FM SUGAR BTM RD

Over: TURKEY CREEK

080061105, Johnson, IA

Built 1964 Load: 26.6 t ADT: 990

FM

Over: PLUM CREEK

081082403, Johnson, IA

Built 1934 Load: 26.6 t ADT: 130

UTAH AVE

Over: STREAM

077052906, Johnson, IA

Built 1994 Load: 27.6 t ADT: 70

FM IWV RD

Over: N BRANCH OLD MANS CR

079081503, Johnson, IA

Built 2004 Load: 28.2 t ADT: 480

WB I-80

Over: CIC RAILWAY

3.0 mi. E of jct. I-380, Johnson, IA

Built 1963 Load: 28.6 t ADT: 30,600

JOHNSON-IOWA RD

Over: BRANCH TO CLEAR CREEK

080081902, Johnson, IA

Built 1979 Load: 28.6 t ADT: 61

EB I-80

Over: CIC RAILWAY

3.0 mi. E of jct. I-380, Johnson, IA

Built 1963 Load: 28.8 t ADT: 30,600

FM

Over: SNYDER CR

079052901, Johnson, IA

Built 1977 Load: 28.8 t ADT: 130

SW CALKINS AVE

Over: N BR CREEK

079080902, Johnson, IA

Built 1920 Load: 29.4 t ADT: 26

FM SW BLK DIMND

Over: STREAM

079083405, Johnson, IA

Built 1900 Load: 29.4 t ADT: 970

SB IA 1

Over: RALSTON CREEK

2.5 MI. S OF JCT. I-80, Johnson, IA

Built 1953 Load: 29.7 t ADT: 3,650

W 295TH ST

Over: RHINE CREEK

080082803, Johnson, IA

Built 1986 Load: 29.7 t ADT: 102

LOCAL

Over: PLUM CR

081081301, Johnson, IA

Built 1996 Load: 29.7 t ADT: 15

FM SAND RD

Over: PECHMAN CREEK

078062404, Johnson, IA

Built 1976 Load: 29.8 t ADT: 1,210

FM 180TH ST

Over: STREAM

081052303, Johnson, IA

Built 1978 Load: 30.0 t ADT: 180

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