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:

480TH ST

Over: SMALL

078061201, Johnson, IA

Built 1978 Load: 36.0 t ADT: 81

SW 480TH ST

Over: STREAM

078070803, Johnson, IA

Built 1970 Load: 36.0 t ADT: 20

SW KANSAS AVE

Over: STREAM

078072302, Johnson, IA

Built 1993 Load: 36.0 t ADT: 40

SW 540TH ST

Over: STREAM

078072501, Johnson, IA

Built 1972 Load: 36.0 t ADT: 45

SW 520TH ST

Over: BR DEER CREEK

078082101, Johnson, IA

Built 1991 Load: 36.0 t ADT: 5

FM SAND RD

Over: STREAM

079063502, Johnson, IA

Built 1976 Load: 36.0 t ADT: 3,330

FM IVY AVE

Over: DEER CREEK

079070402, Johnson, IA

Built 1994 Load: 36.0 t ADT: 790

FM ROHRET RD

Over: DRAINAGE

079072303, Johnson, IA

Built 1900 Load: 36.0 t ADT: 270

FM SW BLK HWK D

Over: N BR OLD MAN'S CR

079080508, Johnson, IA

Built 2000 Load: 36.0 t ADT: 1,450

SW EAGLE AVE

Over: STREAM

079081504, Johnson, IA

Built 1900 Load: 36.0 t ADT: 35

280TH ST NE

Over: NICHOLSON CREEK

080052401, Johnson, IA

Built 1982 Load: 36.0 t ADT: 122

FM SO FRONT ST

Over: MUDDY CREEK

000000000, Johnson, IA

Built 2002 Load: 36.0 t ADT: 7,700

FM PRARE DU CHN

Over: BR RAPID CREEK

080062604, Johnson, IA

Built 1993 Load: 36.0 t ADT: 980

NEWPORT RD

Over: BR TURKEY CR

080062608, Johnson, IA

Built 1976 Load: 36.0 t ADT: 760

FM 250TH ST

Over: BR BUFFALO CK

080070903, Johnson, IA

Built 1978 Load: 36.0 t ADT: 920

FM JAMES AVE

Over: BUFFALO CREEK

000000000, Johnson, IA

Built 1960 Load: 36.0 t ADT: 1,990

FM 250TH ST

Over: DRAINAGE DITCH

080080903, Johnson, IA

Built 1978 Load: 36.0 t ADT: 620

SUTLIFF RD

Over: STREAM

081051903, Johnson, IA

Built 1900 Load: 36.0 t ADT: 340

SEVEN SIS RD

Over: LINGLE CREEK

081060305, Johnson, IA

Built 1979 Load: 36.0 t ADT: 35

NE HICKORY H RD

Over: W HOOSIER CR

081071303, Johnson, IA

Built 1977 Load: 36.0 t ADT: 300

LINN-JOHNSON RD

Over: STREAM

081080501, Johnson, IA

Built 1974 Load: 36.0 t ADT: 60

FM 120TH ST

Over: BR PLUM CR

081081201, Johnson, IA

Built 1989 Load: 36.0 t ADT: 1,630

LOCAL

Over: HOCKEYS SLOUGH

077051202, Johnson, IA

Built 2001 Load: 36.0 t ADT: 40

LINN-JOHNSON RD

Over: STREAM

081080401, Johnson, IA

Built 1975 Load: 36.1 t ADT: 102

FM SW 540TH AVE

Over: DEER CREEK

078082903, Johnson, IA

Built 1976 Load: 36.2 t ADT: 900

SW BUCHANAN AVE

Over: DRAINAGE

078082004, Johnson, IA

Built 1974 Load: 37.4 t ADT: 15

FM ELY RD

Over: LINGLE CREEK

081060904, Johnson, IA

Built 1955 Load: 37.9 t ADT: 3,930

FM AM LEGION RD

Over: SNYDER CREEK

079051703, Johnson, IA

Built 1978 Load: 39.0 t ADT: 1,480

COSGROVE RD

Over: OLD MANS CREEK

078080210, Johnson, IA

Built 2012 Load: 39.3 t ADT: 61

LINN-JOHNSON RD

Over: CHERRY CREEK

081080101, Johnson, IA

Built 2001 Load: 39.3 t ADT: 80

SW BLK DIAMOND

Over: OLD WOMAN'S CREEK

079072705, Johnson, IA

Built 2006 Load: 43.4 t ADT: 650

FM

Over: MILLER CREEK

078081902, Johnson, IA

Built 2001 Load: 45.7 t ADT: 600

SB US 218

Over: CROOKED CREEK

2.4 mi. N of Jct. IA 22, Johnson, IA

Built 1982 Load: 52.2 t ADT: 9,650

NAPOLEON ST

Over: SNYDER CREEK

078060101, Johnson, IA

Built 1987 Load: 57.8 t ADT: 381

DUBUQUE ST

Over: IOWA RIVER

080063318, Johnson, IA

Built 1991 Load: 76.1 t ADT: 6,900

1ST AVE

Over: RALSTON CREEK S. BRANCH

079061300, Johnson, IA

Built 1997 Load: 20.1 t ADT: 14,992

OAKDALE BLVD

Over: MUDDY CREEK

000000000, Johnson, IA

Built 1996 Load: 24.5 t ADT: 5,803

FM SAND RD

Over: STREAM

078060204, Johnson, IA

Built 2005 Load: 25.1 t ADT: 2,620

FM SW BLK DIMND

Over: OLD MAN'S CREEK

000000000, Johnson, IA

Built 2009 Load: 25.6 t ADT: 670

NW BAXTER AVE

Over: KNAPP CREEK

081080604, Johnson, IA

Built 1995 Load: 30.7 t ADT: 15

EAGLE AVE

Over: CLEAR CREEK

080082308, Johnson, IA

Built 1993 Load: 32.2 t ADT: 15

SW NAPLES AVE

Over: BR OLD MAN CR

078060802, Johnson, IA

Built 1997 Load: 32.3 t ADT: 102

SW EAGLE AVENUE

Over: F OLD MANS CREEK

079081004, Johnson, IA

Built 2002 Load: 32.3 t ADT: 51

1ST AVENUE

Over: MUDDY CREEK

080063204, Johnson, IA

Built 1988 Load: 32.3 t ADT: 6,625

IA 1 NB

Over: RALSTON CREEK

2.3 MI. S. OF I-80, Johnson, IA

Built 2019 Load: 32.4 t ADT: 2,850

I 80 EB

Over: CLEAR CREEK

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

Built 2023 Load: 32.4 t ADT: 13,450

I 80 WB

Over: CLEAR CREEK

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

Built 2022 Load: 32.4 t ADT: 13,450

F46 IWV RD

Over: OLD WOMANS CR

079081401, Johnson, IA

Built 2005 Load: 32.4 t ADT: 480

PRENTISS ST

Over: RALSTON CREEK

079061500, Johnson, IA

Built 2020 Load: 32.4 t ADT: 1,664

I80 WB TO I380 NB

Over: CLEAR CREEK

I-80/I-380/US 218 INTERCH, Johnson, IA

Built 2021 Load: 32.4 t ADT: 13,800

Read our methodology — how this data is sourced, computed, and verified.

Related

Browse all → | Rankings →

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 6, 2026