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:

FM SAND RD SE

Over: BUCK CREEK

077060204, Johnson, IA

Built 1964 Load: 30.3 t ADT: 1,210

FM SW NAPLES AV

Over: DIRTY FACE CREEK

078061704, Johnson, IA

Built 1980 Load: 30.3 t ADT: 270

FM 500TH ST

Over: BR DIRTY FACE CR

078071409, Johnson, IA

Built 1977 Load: 30.3 t ADT: 270

FM SW KANSAS

Over: STREAM

078071404, Johnson, IA

Built 1978 Load: 30.3 t ADT: 270

SW 360TH ST

Over: N BR CREEK

079080803, Johnson, IA

Built 1965 Load: 30.7 t ADT: 61

ROHRET RD

Over: N FORK OLD MANS CREEK

079082601, Johnson, IA

Built 1978 Load: 30.7 t ADT: 30

NW 120TH ST

Over: STREAM

081080801, Johnson, IA

Built 1966 Load: 30.7 t ADT: 1,250

500TH ST SE

Over: STREAM

078051403, Johnson, IA

Built 1969 Load: 30.8 t ADT: 35

500TH ST

Over: STREAM

078051702, Johnson, IA

Built 1966 Load: 30.8 t ADT: 133

FM 540TH ST

Over: STREAM

078052001, Johnson, IA

Built 1955 Load: 30.8 t ADT: 880

NAPOLEON ST

Over: STREAM

078060203, Johnson, IA

Built 1972 Load: 30.8 t ADT: 388

SW OBSRVTRY AVE

Over: STREAM

078063306, Johnson, IA

Built 1973 Load: 30.8 t ADT: 72

SW JAMES AVE

Over: STREAM

078071502, Johnson, IA

Built 1960 Load: 30.8 t ADT: 41

LOCAL

Over: STREAM

078082102, Johnson, IA

Built 1966 Load: 30.8 t ADT: 61

MORMON TRK BLVD

Over: WILLOW CREEK

079061700, Johnson, IA

Built 1971 Load: 31.6 t ADT: 12,954

SW 400TH ST

Over: OLD MANS CREEK

079082301, Johnson, IA

Built 1975 Load: 32.2 t ADT: 51

NW 160TH ST

Over: STREAM

081082401, Johnson, IA

Built 1993 Load: 32.2 t ADT: 20

SW 480TH ST

Over: BR DIRTY FACE CR

078071101, Johnson, IA

Built 1920 Load: 32.3 t ADT: 61

CHAMBERS AVE

Over: CLEAR CREEK

080082804, Johnson, IA

Built 1977 Load: 32.3 t ADT: 170

LINN-JOHNSON RD

Over: KNAPP CREEK

081080601, Johnson, IA

Built 1984 Load: 32.3 t ADT: 46

IA 1

Over: RALSTON CREEK

0.6 MI. N OF N JCT. US 6, Johnson, IA

Built 1932 Load: 32.5 t ADT: 13,500

FM 340TH ST

Over: STREAM

079070601, Johnson, IA

Built 1900 Load: 32.7 t ADT: 260

JORDAN CK RD

Over: JORDAN CREEK

081062602, Johnson, IA

Built 1971 Load: 32.7 t ADT: 72

1ST AVE

Over: RALSTON CREEK N. BRANCH

079061200, Johnson, IA

Built 1984 Load: 32.7 t ADT: 7,143

GOLFVIEW DRIVE

Over: MUDDY CREEK

East of Crandic RR, Johnson, IA

Built 2012 Load: 32.7 t ADT: 1,480

RACHAEL STREET

Over: MUDDY CREEK

East of Crandic RR, Johnson, IA

Built 2003 Load: 32.7 t ADT: 240

FM PRARE DU CHN

Over: RAPID CREEK

080063504, Johnson, IA

Built 1975 Load: 32.8 t ADT: 1,970

DEER CREEK RD

Over: STREAM

000000000, Johnson, IA

Built 1972 Load: 32.8 t ADT: 1,267

FM SUTLIFF RD

Over: CLEAR CREEK

081050102, Johnson, IA

Built 1974 Load: 32.8 t ADT: 610

FM SE 670TH ST

Over: PRAIRIE CREEK

077053009, Johnson, IA

Built 1966 Load: 33.0 t ADT: 100

580TH ST SE

Over: OTTER CREEK

077060101, Johnson, IA

Built 1964 Load: 33.0 t ADT: 81

FM

Over: STREAM

078071604, Johnson, IA

Built 1900 Load: 33.0 t ADT: 460

FM SW KANAS AVE

Over: PICAYUNE CREEK

078072602, Johnson, IA

Built 1978 Load: 33.0 t ADT: 90

SW 470TH ST

Over: STREAM

078070403, Johnson, IA

Built 1973 Load: 33.1 t ADT: 30

W BENTON ST

Over: WILLOW CREEK

079061700, Johnson, IA

Built 1971 Load: 33.9 t ADT: 6,100

NB US 218

Over: OLD MAN CREEK OVERFLOW

0.6 mi. N of Observ. Ave, Johnson, IA

Built 1983 Load: 33.9 t ADT: 10,250

LOWER OLD HWY 6

Over: STREAM

080082303, Johnson, IA

Built 1900 Load: 34.0 t ADT: 510

FM SW 500TH ST

Over: DEER CREEK

078081701, Johnson, IA

Built 1973 Load: 34.6 t ADT: 690

DEER CK RD

Over: DEER CREEK

079070102, Johnson, IA

Built 1972 Load: 34.6 t ADT: 1,363

ZELLER STREET

Over: MUDDY CREEK

West of Crandic RR, Johnson, IA

Built 1999 Load: 34.7 t ADT: 4,290

HOLIDAY RD

Over: OVER CIC RR

000000000, Johnson, IA

Built 1979 Load: 34.9 t ADT: 5,126

SE SIOUX AVE

Over: CROOKED CREEK

078053102, Johnson, IA

Built 1992 Load: 35.0 t ADT: 40

SW HAZELWOOD AV

Over: STREAM

078070804, Johnson, IA

Built 1966 Load: 35.3 t ADT: 72

LOCAL

Over: STREAM

080061204, Johnson, IA

Built 1972 Load: 35.3 t ADT: 153

SWAN LAKE RD NE

Over: STREAM

080070503, Johnson, IA

Built 1973 Load: 35.3 t ADT: 100

HWY 382

Over: SMALL NATURAL STREAM

081062303, Johnson, IA

Built 1958 Load: 36.0 t ADT: 3,810

FM SW WAPELLO A

Over: BR PRAIRIE CR

077052202, Johnson, IA

Built 1977 Load: 36.0 t ADT: 1,110

S.E.WAPELLO AVE

Over: RICHEY CREEK

077052502, Johnson, IA

Built 1994 Load: 36.0 t ADT: 20

FM SE SIOUX AVE

Over: STREAM

077053004, Johnson, IA

Built 1969 Load: 36.0 t ADT: 110

FM

Over: BUCK CREEK

078052803, Johnson, IA

Built 1991 Load: 36.0 t ADT: 30

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