County profile · official public datasets

Johnson County, MO

476 public highway bridges tracked in the FHWA National Bridge Inventory: 39.3% rated Good, 56.3% Fair, 4.4% Poor.

476
Public bridges
39.3%
Good condition
4.4%
Poor condition

The verdict

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

Johnson County posts a top-quartile lowest Poor-condition share among rated counties in the state across mid-size county bridge inventory.

Top 14%
lowest Poor share in state
4.4%
Poor-condition share
476
public highway bridges
1975
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 #16 of 115 Missouri counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.4%). Johnson County, Missouri contains 476 public highway bridges. Roughly 39.3% are rated “Good,” 56.3% “Fair,” and 4.4% “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

476

Public highway bridges in Johnson County

Good condition

39.3%

187 of 476 rated 7-9

Fair condition

56.3%

268 of 476 rated 5-6

Poor condition

4.4%

21 of 476 rated 4 or below

In-state Poor-share rank

#16 of 115

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

Condition distribution

Share of 476 NBI-tracked bridges by lowest applicable component rating.

Good
39.3% (187)
Fair
56.3% (268)
Poor
4.4% (21)

Johnson County's Poor-condition bridges carry 18,285 vehicle crossings a day

That is 4.1% of the county's reported daily bridge traffic on 4.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 871 crossings a day against 642 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 476 of 476 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

30.7% of Johnson County's bridges have passed the 50-year mark

146 of the 476 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 39.3% 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 45.6% of the county's Poor-condition bridge traffic

US 50 E over UP RR, built 1968, carries 8,346 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 21-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 18,285 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

476 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1990s, when 151 of the county's bridges still in the inventory were built, which is 31.7% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year (1975) matches the Missouri average (1979).

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

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

The 5 Missouri counties nearest Johnson County in number of bridges, with their condition splits. Its 4.4% Poor share is the 3rd-lowest of these 6. Its average build year of 1975 against a peer-group mean of 1981 is 6 years older.

Showing the 5 closest of 114 Missouri counties eligible for comparison.

Bridge inventory size and condition shares for Johnson County and the 5 Missouri counties closest to it in inventory size
County Bridges Poor
Greene County 493 5.3%
Johnson County (this page) 476 4.4%
Jasper County 471 11%
Clay County 436 6.9%
Stoddard County 434 3.7%
St. Charles County 417 3.4%

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

Similar inventory size

Nearest county inventories outside MO (476 bridges here).

Similar average build year

Nearest mean year-built outside MO (1975 here).

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

All 476 Good 187 Fair 268 Poor 21

All bridges (476)

US 50 W

Fair

Over: DEVILS BR

S 15 T 46 N R 26 W, Johnson, MO

Built 1967 Load: 43.2 t ADT: 10,295

CO RD NW 1571

Fair

Over: BR N FK BLACKWATER

S 5 T 47 N R 28 W, Johnson, MO

Built 1996 Load: 44.1 t ADT: 40

CO RD SE 500

Fair

Over: FLETCHER CR

S 20 T 45 N R 25 W, Johnson, MO

Built 1900 Load: 44.1 t ADT: 60

MO 58 E

Fair

Over: BRIAR CR

S 6 T 45 N R 26 W, Johnson, MO

Built 2017 Load: 45.0 t ADT: 2,108

RT O S

Fair

Over: POST OAK CR

S 21 T 45 N R 27 W, Johnson, MO

Built 1966 Load: 45.0 t ADT: 372

US 50 W

Fair

Over: BLACKWATER RVR

S 19 T 47 N R 28 W, Johnson, MO

Built 1952 Load: 46.8 t ADT: 10,124

CO RD SW 1501

Fair

Over: BR OF BIG CR

S 28 T 45 N R 38 W, Johnson, MO

Built 2000 Load: 47.7 t ADT: 20

US 50 W

Fair

Over: ROBINSON BR

S 22 T 47 N R 29 W, Johnson, MO

Built 1922 Load: 48.6 t ADT: 8,578

CO RD SE 321

Fair

Over: BR OF CLEAR CR

S 28 T 45 N R 25 W, Johnson, MO

Built 2001 Load: 50.4 t ADT: 20

MO 23 S

Fair

Over: N FK CLEAR CR

S 21 T 46 N R 24 W, Johnson, MO

Built 1995 Load: 52.2 t ADT: 7,360

MCPHERSON ST

Fair

Over: UP RR

S 21 T 46 N R 24 W, Johnson, MO

Built 1995 Load: 54.9 t ADT: 6,550

US 50 E

Fair

Over: MAYES BR

S 15 T 46 N R 25 W, Johnson, MO

Built 1968 Load: 55.8 t ADT: 20,187

CO RD NE 501

Fair

Over: BLACKJACK CR

S 14 T 47 N R 25 W, Johnson, MO

Built 1910 Load: 56.7 t ADT: 55

BOMBER BOULEVARD

Fair

Over: LONG BRANCH CREEK

0.09 MILES NORTH OF VACE, Johnson, MO

Built 1990 Load: 67.1 t ADT: 80

CO RD SE 500

Fair

Over: BR OF FLETCHER CR

S 17 T 45 N R 25 W, Johnson, MO

Built 2001 Load: 67.5 t ADT: 60

MO 58 E

Fair

Over: W PIN OAK CR

S 9 T 45 N R 28 W, Johnson, MO

Built 1935 Load: 67.5 t ADT: 3,149

CO RD SE 301

Fair

Over: MINERAL CR

S 17 T 44 N R 25 W, Johnson, MO

Built 1996 Load: 72.0 t ADT: 60

MO 13 S

Fair

Over: BRAWLEY CR

S 36 T 45 N R 26 W, Johnson, MO

Built 1922 Load: 72.0 t ADT: 4,577

CO RD NW 271

Good

Over: BLACKJACK CR

S 28 T 48 N R 26 W, Johnson, MO

Built 1999 Load: 8.1 t ADT: 150

CO RD NW 1050

Good

Over: BLACKJACK CR

S 33 T 48 N R 26 W, Johnson, MO

Built 2000 Load: 9.0 t ADT: 45

CO RD NW 821

Good

Over: BR OF BLACKWATER R

S 9 T 46 N R 27 W, Johnson, MO

Built 2000 Load: 10.8 t ADT: 20

CO RD NW 1001

Good

Over: BR N FK BLACKWATER

S 29 T 47 N R 27 W, Johnson, MO

Built 2000 Load: 11.7 t ADT: 48

CO RD SE 300

Good

Over: E BEAR CR

S 4 T 45 N R 25 W, Johnson, MO

Built 1900 Load: 12.6 t ADT: 45

CO RD NW 200

Good

Over: MAYES BLACKWATER R

S 22 T 46 N R 25 W, Johnson, MO

Built 2000 Load: 12.6 t ADT: 45

CO RD NW 1051

Good

Over: LIT BLACKWATER CR

S 7 T 46 N R 27 W, Johnson, MO

Built 2005 Load: 12.6 t ADT: 110

CO RD NE 1200

Good

Over: MARTIN BR

S 26 T 48 N R 24 W, Johnson, MO

Built 2002 Load: 13.5 t ADT: 60

CO RD NW 750

Good

Over: BR N FK BLACKWATER

S 17 T 47 N R 27 W, Johnson, MO

Built 1999 Load: 15.3 t ADT: 48

COUNTY RD NE 500

Good

Over: LIT WALNUT CR

S 35 T 47 N R 24 W, Johnson, MO

Built 2010 Load: 15.3 t ADT: 40

CO RD SW 1000

Good

Over: LIT WALNUT CR

S 7 T 44 N R 28 W, Johnson, MO

Built 2000 Load: 16.2 t ADT: 45

CO RD NW 700

Good

Over: BR OF WALNUT CR

S 21 T 47 N R 24 W, Johnson, MO

Built 2000 Load: 16.2 t ADT: 30

CO RD SW 75

Good

Over: PIN OAK CR

S 25 T 46 N R 28 W, Johnson, MO

Built 2011 Load: 16.2 t ADT: 45

CO RD NW 701

Good

Over: BUTCHER BR

S 22 T 46 N R 27 W, Johnson, MO

Built 2014 Load: 17.1 t ADT: 50

CO RD SW 101

Good

Over: FLETCHER CR

S 10 T 45 N R 26 W, Johnson, MO

Built 2011 Load: 17.1 t ADT: 110

CO RD SW 1821

Good

Over: W BR OF LOST CR

S 14 T 45 N R 29 W, Johnson, MO

Built 1900 Load: 18.0 t ADT: 60

CO RD NW 100

Good

Over: BR OF S FK BLACWAT

S 23 T 46 N R 29 W, Johnson, MO

Built 2001 Load: 18.0 t ADT: 50

CO RD SE 1821

Good

Over: W BR OF LOST CR

S 11 T 45 N R 29 W, Johnson, MO

Built 1900 Load: 18.9 t ADT: 60

CO RD SW 21

Good

Over: BR OF BRAWLEY CR

S 25 T 45 N R 26 W, Johnson, MO

Built 2002 Load: 18.9 t ADT: 50

CO RD NW 575

Good

Over: TRIB BLACKWATER RV

S 28 T 47 N R 26 W, Johnson, MO

Built 1994 Load: 19.8 t ADT: 45

CO RD NE 500

Good

Over: WALNUT CR

S 27 T 47 N R 24 W, Johnson, MO

Built 1999 Load: 19.8 t ADT: 50

CO RD 1250

Good

Over: PANTHER CR

S 29 T 44 N R 28 W, Johnson, MO

Built 1999 Load: 19.8 t ADT: 45

CO RD SE 501

Good

Over: MAYES BR OF BEAR C

S 22 T 46 N R 25 W, Johnson, MO

Built 2000 Load: 19.8 t ADT: 55

CO RD SW 21

Good

Over: BROWLEY CR

S 26 T 45 N R 26 W, Johnson, MO

Built 2006 Load: 19.8 t ADT: 50

CO RD NE 401

Good

Over: FLAGSTAFF CR

S 2 T 47 N R 25 W, Johnson, MO

Built 1997 Load: 20.7 t ADT: 60

CO RD 450

Good

Over: BR OF BLACKWATER R

S 33 T 47 N R 26 W, Johnson, MO

Built 1998 Load: 20.7 t ADT: 30

CO RD NE 221

Good

Over: FLAGSTAFF CR

S 5 T 47 N R 25 W, Johnson, MO

Built 2000 Load: 20.7 t ADT: 55

COUNTY RD NW 650

Good

Over: BR S FK BLACKWATER

S 19 T 47 N R 28 W, Johnson, MO

Built 2018 Load: 20.7 t ADT: 40

CO RD SW 400

Good

Over: SMALL CR

S 9 T 45 N R 28 W, Johnson, MO

Built 1991 Load: 21.6 t ADT: 81

CO RD SW 850

Good

Over: BR OF BEAR CR

S 1 T 44 N R 28 W, Johnson, MO

Built 1998 Load: 21.6 t ADT: 30

CO RD SW 1000

Good

Over: BR OF POST OAK CR

S 15 T 44 N R 26 W, Johnson, MO

Built 1997 Load: 21.6 t ADT: 30

CO RD NW 921

Good

Over: BR BLACKWATER RVR

S 4 T 46 N R 27 W, Johnson, MO

Built 1999 Load: 21.6 t ADT: 40

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

Related

Browse all → | Rankings →
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.