County profile · official public datasets

Johnson County, IN

230 public highway bridges tracked in the FHWA National Bridge Inventory: 41.3% rated Good, 50.4% Fair, 8.3% Poor.

230
Public bridges
41.3%
Good condition
8.3%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Johnson County pairs a higher-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

77th
of 92 on Poor share
8.3%
Poor-condition share
230
public highway bridges
1983
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Johnson County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Johnson County ranks #77 of 92 Indiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 8.3%). Johnson County, Indiana contains 230 public highway bridges. Roughly 41.3% are rated “Good,” 50.4% “Fair,” and 8.3% “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.

Total bridges

230

Public highway bridges in Johnson County

Good condition

41.3%

95 of 230 rated 7-9

Fair condition

50.4%

116 of 230 rated 5-6

Poor condition

8.3%

19 of 230 rated 4 or below

In-state Poor-share rank

#77 of 92

Among Indiana counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 230 NBI-tracked bridges by lowest applicable component rating.

Good
41.3% (95)
Fair
50.4% (116)
Poor
8.3% (19)

Johnson County's Poor-condition bridges carry 37,360 vehicle crossings a day

That is 2.4% of the county's reported daily bridge traffic on 8.3% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,966 crossings a day against 10,206 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 230 of 230 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

33.9% of Johnson County's bridges have passed the 50-year mark

78 of the 230 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 41.3% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

One structure carries 48.2% of the county's Poor-condition bridge traffic

SMITH VALLEY ROAD over CONRAIL RAILROAD, built 1972, carries 18,020 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 19-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 37,360 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Johnson County's bridges were built

230 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1970s, when 49 of the county's bridges still in the inventory were built, which is 21.3% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1983, 5 years newer than the Indiana average of 1978.

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Johnson County compares with Indiana's closest counties by inventory size

The 5 Indiana counties nearest Johnson County in number of bridges, with their condition splits. Its 8.3% Poor share is the 5th-lowest of these 6. Its average build year of 1983 against a peer-group mean of 1978 is 5 years newer.

Showing the 5 closest of 91 Indiana counties eligible for comparison.

Bridge inventory size and condition shares for Johnson County and the 5 Indiana counties closest to it in inventory size
County Bridges Poor
Greene County 239 9.2%
Monroe County 232 2.2%
Johnson County (this page) 230 8.3%
LaPorte County 227 6.6%
Rush County 227 4%
St. Joseph County 227 4.8%

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Johnson County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Johnson County, both outside Indiana so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside IN (230 bridges here).

Similar average build year

Nearest mean year-built outside IN (1983 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 230 Good 95 Fair 116 Poor 19

Good-condition bridges (95)

I-65 NB

Good

Over: SR 44

09.48 N SR 252, Johnson, IN

Built 1970 Load: 22.4 t ADT: 26,288

CR 750N

Good

Over: I-65 NB/SB

07.68 N SR 44, Johnson, IN

Built 2015 Load: 22.7 t ADT: 18,003

MERIDIAN STREET

Good

Over: PLEASANT RUN CREEK

0.05 S OF MAIN STREET, Johnson, IN

Built 1994 Load: 23.7 t ADT: 4,937

VILLAGE CROSSING

Good

Over: GRASSY CREEK

0.05 W OF BLUE GRASS, Johnson, IN

Built 2002 Load: 25.2 t ADT: 1,309

CROSS WIND DRIVE

Good

Over: GRASSY CREEK

0.07 W OF BLUE GRASS, Johnson, IN

Built 2002 Load: 25.2 t ADT: 343

CR 150 NORTH

Good

Over: HENDERSON CREEK

0.20 E OF CR 700 W, Johnson, IN

Built 2000 Load: 27.4 t ADT: 250

COUNTY LINE RD

Good

Over: I-65 NB

03.36 N SR 252, Johnson, IN

Built 1969 Load: 27.9 t ADT: 479

COUNTY LINE RD

Good

Over: I-65 SB

03.36 N SR 252, Johnson, IN

Built 1969 Load: 27.9 t ADT: 479

CR 700 NORTH

Good

Over: FLAT BRANCH CREEK

0.75 E OF CR 600 E, Johnson, IN

Built 2000 Load: 28.9 t ADT: 3,191

CR 400 SOUTH

Good

Over: YOUNGS CREEK

0.30 W OF US 31, Johnson, IN

Built 1993 Load: 29.0 t ADT: 85

CR 400 EAST

Good

Over: HURRICANE CREEK

0.25 N OF CR 600 N, Johnson, IN

Built 1997 Load: 30.8 t ADT: 1,993

CR 500 N

Good

Over: I-65

04.87 N SR 44, Johnson, IN

Built 1971 Load: 31.1 t ADT: 16,999

E JEFFERSON STREET

Good

Over: HURRICANE CREEK

0.86 E OF US 31, Johnson, IN

Built 2004 Load: 31.4 t ADT: 9,205

SR 144

Good

Over: YOUNGS CREEK

00.33 W SR 44, Johnson, IN

Built 2005 Load: 32.4 t ADT: 8,324

I-65

Good

Over: DRAINAGE DITCH

05.80 S I-465, Johnson, IN

Built 1971 Load: 32.7 t ADT: 92,074

HOSPITAL ROAD

Good

Over: NINEVEH CREEK

00.00 ATTERBURY-MILITARY, Johnson, IN

Built 1997 Load: 32.7 t ADT: 857

SR 44

Good

Over: AMITY DITCH

01.22 E I-65, Johnson, IN

Built 2009 Load: 32.7 t ADT: 8,150

CR 800 EAST

Good

Over: BIG BLUE RIVER

0.30 S OF CR 650 S, Johnson, IN

Built 1975 Load: 32.7 t ADT: 2,101

PETERMAN ROAD

Good

Over: BUFFALO CREEK

0.20 S COUNTY LINE ROAD, Johnson, IN

Built 2000 Load: 32.7 t ADT: 5,787

KING STREET

Good

Over: HURRICANE CREEK

0.30 E OF HOME AVENUE, Johnson, IN

Built 2002 Load: 32.7 t ADT: 3,853

MAIN STREET

Good

Over: PLEASANT CREEK

0.10 E OF WASHINGTON ST, Johnson, IN

Built 2006 Load: 32.7 t ADT: 13,580

WASHINGTON STREET

Good

Over: PLEASANT CREEK

0.05 S OF MAIN STREET, Johnson, IN

Built 2003 Load: 32.7 t ADT: 1,529

WILLSHIRE DRIVE

Good

Over: TURKEY PEN CREEK

0.06 S OF WINCHESTER DR, Johnson, IN

Built 1996 Load: 32.7 t ADT: 434

CR 250 SOUTH

Good

Over: AMITY DITCH

0.70 E OF CR 510 E, Johnson, IN

Built 1999 Load: 32.7 t ADT: 366

CR 100 WEST

Good

Over: BRANCH OF RAY CREEK

0.10 N OF SR 44, Johnson, IN

Built 2002 Load: 32.7 t ADT: 218

CR 375 EAST

Good

Over: LEATHERWOOD CREEK

0.60 N OF CR 1000 N, Johnson, IN

Built 2005 Load: 32.7 t ADT: 348

CR 200 NORTH

Good

Over: POWEL DITCH

1.20 W OF US 31, Johnson, IN

Built 2006 Load: 32.7 t ADT: 6,811

CR 100 EAST

Good

Over: BUCKHART CREEK

0.30 S OF CR 300 S, Johnson, IN

Built 2008 Load: 32.7 t ADT: 2,167

MORGANTOWN RD

Good

Over: HONEY CREEK

0.01 @ MORGANTN & CR800N, Johnson, IN

Built 2009 Load: 32.7 t ADT: 9,095

CR 550 EAST

Good

Over: RANDSELL DITCH

0.20 N OF CR 700 N, Johnson, IN

Built 1995 Load: 32.7 t ADT: 220

CR 1050 NORTH

Good

Over: LEATHERWOOD CREEK

0.05 E OF CR 375 E, Johnson, IN

Built 1990 Load: 32.7 t ADT: 344

CR 440 EAST

Good

Over: LEATHERWOOD CREEK

0.02 N OF CR 1000 N, Johnson, IN

Built 2020 Load: 33.0 t ADT: 2,047

CR 75 WEST

Good

Over: RA ARMSTRONG DITCH

0.50 N OF CR 200 N, Johnson, IN

Built 2002 Load: 33.4 t ADT: 324

CR 375 SOUTH

Good

Over: BUCKHART CREEK

0.20 E OF CR 25 W, Johnson, IN

Built 1988 Load: 33.6 t ADT: 146

CR 300 SOUTH

Good

Over: KOOTS CREEK

0.20 E OF CR 775 W, Johnson, IN

Built 2000 Load: 33.7 t ADT: 104

CR 900 NORTH

Good

Over: FLAT BRANCH CREEK

0.50 E OF CR 700 E, Johnson, IN

Built 1998 Load: 33.7 t ADT: 149

BROADWAY STREET

Good

Over: LEE PARK DITCH

0.02 W OF WATER STREET, Johnson, IN

Built 2003 Load: 33.7 t ADT: 1,158

MAUXFERRY ROAD

Good

Over: BUCKHART CREEK

0.40 S OF CR 300 S, Johnson, IN

Built 1959 Load: 34.1 t ADT: 1,721

SR 44

Good

Over: SUGAR CREEK OVERFLOW

03.33 E I-65, Johnson, IN

Built 1983 Load: 34.3 t ADT: 6,282

I-65 NB

Good

Over: HURRICANE CREEK

03.52 N SR 44, Johnson, IN

Built 2017 Load: 34.3 t ADT: 38,171

I-65 SB

Good

Over: HURRICANE CREEK

03.52 N SR 44, Johnson, IN

Built 2017 Load: 34.3 t ADT: 31,581

PETERMAN ROAD

Good

Over: PLEASANT RUN CREEK

0.30 N OF FAIRVIEW ROAD, Johnson, IN

Built 2023 Load: 34.3 t ADT: 6,213

CR 200 NORTH

Good

Over: BREWER DITCH

0.50 E OF CENTER, Johnson, IN

Built 1990 Load: 34.8 t ADT: 6,811

CR 775 SOUTH

Good

Over: BR OF NINEVEH CREEK

0.30 E OF CR 100 E, Johnson, IN

Built 2002 Load: 34.8 t ADT: 2,657

CR 200 NORTH

Good

Over: YOUNGS CREEK

0.10 E OF CR 75 W, Johnson, IN

Built 2019 Load: 35.0 t ADT: 1,964

I-69 NB/SB

Good

Over: SMITH VALLEY ROAD

003.07 N SR 144, Johnson, IN

Built 2023 Load: 35.3 t ADT: 21,000

BLUFFDALE DRIVE

Good

Over: HONEY CREEK

0.23 N OF KNIGHT DRIVE, Johnson, IN

Built 2022 Load: 35.6 t ADT: 890

WAKEFIELD ROAD

Good

Over: MESSERSMITH CREEK

0.10 E OF BLUFF ROAD, Johnson, IN

Built 2006 Load: 36.1 t ADT: 1,464

CR 700 WEST

Good

Over: HENDERSON CREEK

0.10 S OF CR 150 N, Johnson, IN

Built 1994 Load: 36.2 t ADT: 85

RUNYON RD/CR 450W

Good

Over: TURKEY PEN CREEK

0.10 N OF CR 800 N, Johnson, IN

Built 1991 Load: 36.3 t ADT: 1,305

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

Related

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.