Johnson County, IA

317 public highway bridges

Johnson County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Johnson County, Iowa contains 317 public highway bridges. Roughly 33.4% are rated “Good,” 45.1% “Fair,” and 8.2% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

317

Total Bridges

33.4%

Good

45.1%

Fair

8.2%

Poor Condition

Condition Distribution

Good

33.4% (106)

Fair

45.1% (143)

Poor

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 public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

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