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:

IA 1 NB

Over: I-80

AT JCT. I-80, Johnson, IA

Built 1962 ADT: 19,500

WB I-80

Over: W38 (BLACK HAWK AVE)

At jct. SR W38., Johnson, IA

Built 1964 ADT: 500

HALF MOON AVE

Over: I-80

2.8 mi. W of Jct. I-380, Johnson, IA

Built 1963 ADT: 34,900

FM

Over: I-80

1.5 MI. W OF Jct. I-380, Johnson, IA

Built 1963 ADT: 31,300

EB I-80

Over: US 6 & IAIS RR

0.9 mi. E of Jct. I-380, Johnson, IA

Built 1995 ADT: 5,400

I 80 WB

Over: US 6 & IAIS RR

0.6 mi. W of Jct SR W60, Johnson, IA

Built 1992 ADT: 5,400

EB I-80

Over: IA 965/CORAL RIDGE AVE

1.6 mi. E of Jct. I-380, Johnson, IA

Built 1963 ADT: 13,950

I 80 WB

Over: IA 965/CORAL RIDGE AVE

1.6 mi. E of Jct. I-380, Johnson, IA

Built 1963 ADT: 13,950

SB DUBUQUE ST

Over: I 80

At the jct. of S.R. W66, Johnson, IA

Built 1963 ADT: 25,450

NB DUBUQUE ST

Over: I 80

At the jct. of S.R. W66, Johnson, IA

Built 1963 ADT: 25,450

WAPSI AVE

Over: I 80

1.2 mi. E of Jct. SR F44, Johnson, IA

FM F-28

Over: I-380

At jct. SR F28, Johnson, IA

Built 1970 ADT: 48,600

FM F-12

Over: I-380 & US 218

2.9 MI. S OF CO RD E70., Johnson, IA

Built 1972 ADT: 55,100

I 380 NB

Over: I 80

I-80 / I-380 INTERCHANGE, Johnson, IA

Built 2021 ADT: 21,450

I 380 NB

Over: US 6

I-80 / I-380 INTERCHANGE, Johnson, IA

Built 2021 ADT: 4,600

I 380 SB

Over: US 6

I-80 / I-380 INTERCHANGE, Johnson, IA

Built 2022 ADT: 4,600

FOREVERGREEN RD

Over: I 380

2 MI. N OF I-80, Johnson, IA

Built 2017 ADT: 53,200

LOCAL RD

Over: I-380

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

Built 1971 ADT: 54,200

I 380 NB

Over: W-60 & CRIC RR

7.4 mi. N of Jct. I-80, Johnson, IA

Built 1971 ADT: 2,220

I 380 SB

Over: W-60 & CIC RR

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

Built 1972 ADT: 2,220

565TH ST

Over: US 218

2.5 mi. N of Hwy 22, Johnson, IA

Built 1980 ADT: 20,100

OBSERVATORY AVE

Over: US 218

At Hills IA Interchange, Johnson, IA

Built 1980 ADT: 19,000

FM F-62

Over: US 218

0.5 mi. N of Jct. SR F62, Johnson, IA

Built 1980 ADT: 21,300

POWESHIEK ST

Over: US 218

2.8 mi. S of Jct. IA 1, Johnson, IA

Built 1983 ADT: 21,300

NB US 218

Over: F50 (OAK CREST HILL RD)

1.6 MI. S OF JCT. IA 1, Johnson, IA

Built 1983 ADT: 545

SB US 218

Over: F50 (OAK CREST HILL RD)

1.6 mi. S of Jct. IA 1, Johnson, IA

Built 1983 ADT: 545

DANE RD

Over: US 218

0.8 mi. S of Jct. IA #1, Johnson, IA

Built 1983 ADT: 18,700

NB IA 1

Over: US 218

AT JCT U.S. 218, Johnson, IA

Built 1983 ADT: 7,950

SB IA 1

Over: US 218

AT JCT U.S. 218, Johnson, IA

Built 1983 ADT: 7,950

ROHRET RD

Over: US 218

1.1 mi. N of Jct. Iowa #1, Johnson, IA

Built 1983 ADT: 33,000

NB US 218

Over: MELROSE AVE

2.3 MI. N OF JCT. IA 1, Johnson, IA

Built 1983 ADT: 2,650

SB US 218

Over: MELROSE AV

2.3 MI. N OF JCT. IA 1, Johnson, IA

Built 1983 ADT: 2,650

US 218 IA 27 NB

Over: I380 SB TO I80 EB RAMP F

I-80, I-380, US 218 INTER, Johnson, IA

US 218 IA 27 SB

Over: I380 SB TO I80 EB RAMP F

I-80, I-380, US 218 INTER, Johnson, IA

I 380 NB

Over: I 80 WB RAMPS

I-80 / I-380 INTERCHANGE, Johnson, IA

I 380 SB

Over: I 80 WB RAMPS

I-80 / I-380 INTERCHANGE, Johnson, IA

I 80 EB

Over: I 80 WB TO US 218 SB

I-80/I-380 INTERCHANGE, Johnson, IA

I 80 WB

Over: I 80 WB TO US 218 SB

I-80 / I-380 INTERCHANGE, Johnson, IA

I80 EB TO I380 NB

Over: I 80/US 218/IA 27

I-80 / I-380 INTERCHANGE, Johnson, IA

Built 2020 ADT: 42,900

I80 EB TO US218 SB

Over: I80 WB TO US 218 SB

I-80 TO I-380 INTERCHANGE, Johnson, IA

I380 SB TO I80 EB

Over: I 80 RAMPS E & G

I-80 / I-380 INTERCHANGE, Johnson, IA

US218NB TO I80 WB

Over: I 80, RAMPS F & G

I-80/I-380 INTERCHANGE, Johnson, IA

SW 360TH ST

Over: N BR OLD MANS CR

079080801, Johnson, IA

Built 1915 Load: 8.5 t ADT: 35

OASIS RD

Over: SMALL

079052402, Johnson, IA

Built 1979 Load: 10.4 t ADT: 61

FM CEDAR CK RD

Over: SMALL STREAM

081050101, Johnson, IA

Built 1946 Load: 10.4 t ADT: 160

VEGA RD

Over: SMALL STREAM

081050304, Johnson, IA

Built 1985 Load: 11.9 t ADT: 45

VINCENT AVE SE

Over: STREAM

078051004, Johnson, IA

Built 1970 Load: 14.5 t ADT: 20

NW CHAMBERS AVE

Over: STREAM

081080904, Johnson, IA

Built 1972 Load: 14.5 t ADT: 92

500TH ST SE

Over: STREAM

078051301, Johnson, IA

Built 1971 Load: 14.8 t ADT: 35

FM

Over: OLD MAN'S CREEK

079083504, Johnson, IA

Built 1969 Load: 16.2 t ADT: 700

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