County profile · official public datasets

Johnson County, KS

781 public highway bridges tracked in the FHWA National Bridge Inventory: 75% rated Good, 23.6% Fair, 1.4% Poor.

781
Public bridges
75%
Good condition
1.4%
Poor condition

The verdict

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

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

Top 21%
lowest Poor share in state
1.4%
Poor-condition share
781
public highway bridges
1992
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 #22 of 104 Kansas counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 1.4%). Johnson County, Kansas contains 781 public highway bridges. Roughly 75% are rated “Good,” 23.6% “Fair,” and 1.4% “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

781

Public highway bridges in Johnson County

Good condition

75%

586 of 781 rated 7-9

Fair condition

23.6%

184 of 781 rated 5-6

Poor condition

1.4%

11 of 781 rated 4 or below

In-state Poor-share rank

#22 of 104

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

Condition distribution

Share of 781 NBI-tracked bridges by lowest applicable component rating.

Good
75% (586)
Fair
23.6% (184)
Poor
1.4% (11)

Johnson County's Poor-condition bridges carry 61,312 vehicle crossings a day

That is 0.7% of the county's reported daily bridge traffic on 1.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 5,574 crossings a day against 11,009 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 781 of 781 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

18.4% of Johnson County's bridges have passed the 50-year mark

144 of the 781 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 75% 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 39.1% of the county's Poor-condition bridge traffic

COLLEGE BLVD over INDIAN CK, built 1976, carries 24,000 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 11-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 61,312 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

781 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1990s, when 186 of the county's bridges still in the inventory were built, which is 23.8% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year is 1992, 20 years newer than the Kansas average of 1972.

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

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

The 5 Kansas counties nearest Johnson County in number of bridges, with their condition splits. Its 1.4% Poor share is the 2nd-lowest of these 6. Its average build year of 1992 against a peer-group mean of 1977 is 15 years newer.

Showing the 5 closest of 103 Kansas counties eligible for comparison.

Bridge inventory size and condition shares for Johnson County and the 5 Kansas counties closest to it in inventory size
County Bridges Poor
Johnson County (this page) 781 1.4%
Sumner County 659 2.6%
Butler County 591 6.1%
McPherson County 586 0.7%
Reno County 573 6.1%
Shawnee County 563 3%

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 Kansas so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside KS (781 bridges here).

Similar average build year

Nearest mean year-built outside KS (1992 here).

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

All 781 Good 586 Fair 184 Poor 11

Poor-condition bridges (11)

KENNETH RD

Poor

Over: NEGRO CK

1500 N OF 151ST ST, Johnson, KS

Built 1910 Load: 10.0 t ADT: 7,700

ARAPAHO #53

Poor

Over: INDIAN CREEK TRIB.

0.1S OF 123RD. ST., Johnson, KS

Built 1989 Load: 12.9 t ADT: 855

GREENWOOD ST. #49

Poor

Over: INDIAN CREEK TRIB.

0.1S OF COLLEGE BLVD., Johnson, KS

Built 1989 Load: 21.2 t ADT: 1,730

207TH ST

Poor

Over: LITTLE BULL CREEK TRIB.

2.8W OF SPRING HILL, Johnson, KS

Built 1989 Load: 26.4 t ADT: 300

103RD. STREET

Poor

Over: TRIB. TO INDIAN CREEK

BETN HAUSER AND NOLAND RD, Johnson, KS

Built 1975 Load: 29.3 t ADT: 8,342

83RD ST. E.47-16.5

Poor

Over: RAILROAD

0.3W OF DESOTO, Johnson, KS

Built 1948 Load: 32.7 t ADT: 1,835

COLLEGE BLVD

Poor

Over: INDIAN CK

300 W OF INDIAN CK PKW, Johnson, KS

Built 1976 Load: 32.7 t ADT: 24,000

K10 HWY WB

Poor

Over: KILL CREEK

5.12 MI E DOUGLAS COL WB, Johnson, KS

Built 1975 Load: 39.0 t ADT: 15,050

44TH TERRACE

Poor

Over: TRIB TO KANSAS RIVER

0.34 MI NORTH OF 47TH ST, Johnson, KS

Built 2002 Load: 40.8 t ADT: 400

WOODLAND DR.

Poor

Over: MILL CREEK TRIBUTARY

0.1 N. OF 75 TH ST., Johnson, KS

Built 1980 Load: 61.8 t ADT: 400

ROBINSON ST.

Poor

Over: NEGRO CK

700 N. OF 155TH ST., Johnson, KS

Built 1986 Load: 71.7 t ADT: 700

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.