County profile · official public datasets

Monroe County, MO

178 public highway bridges tracked in the FHWA National Bridge Inventory: 29.8% rated Good, 55.6% Fair, 14.6% Poor.

178
Public bridges
29.8%
Good condition
14.6%
Poor condition

The verdict

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

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

92nd
of 115 on Poor share
14.6%
Poor-condition share
178
public highway bridges
1974
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.

Monroe County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Monroe County ranks #92 of 115 Missouri counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 14.6%). Monroe County, Missouri contains 178 public highway bridges. Roughly 29.8% are rated “Good,” 55.6% “Fair,” and 14.6% “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

178

Public highway bridges in Monroe County

Good condition

29.8%

53 of 178 rated 7-9

Fair condition

55.6%

99 of 178 rated 5-6

Poor condition

14.6%

26 of 178 rated 4 or below

In-state Poor-share rank

#92 of 115

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

Condition distribution

Share of 178 NBI-tracked bridges by lowest applicable component rating.

Good
29.8% (53)
Fair
55.6% (99)
Poor
14.6% (26)

Monroe County's Poor-condition bridges carry 5,217 vehicle crossings a day

That is 10.4% of the county's reported daily bridge traffic on 14.6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 201 crossings a day against 217 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 178 of 178 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

40.4% of Monroe County's bridges have passed the 50-year mark

72 of the 178 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 29.8% 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 43.7% of the county's Poor-condition bridge traffic

MO 15 S over MID FK SALT RVR, built 1985, carries 2,279 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 26-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 5,217 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Monroe County's bridges were built

178 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1990s, when 27 of the county's bridges still in the inventory were built, which is 15.2% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year is 1974, 5 years older than the Missouri average of 1979.

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

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

The 5 Missouri counties nearest Monroe County in number of bridges, with their condition splits. Its 14.6% Poor share is the 4th-lowest of these 6. Its average build year of 1974 against a peer-group mean of 1977 is in line with the group.

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

Bridge inventory size and condition shares for Monroe County and the 5 Missouri counties closest to it in inventory size
County Bridges Poor
Livingston County 185 15.7%
Polk County 185 20.5%
Ray County 185 12.4%
Scott County 182 6.6%
Clark County 178 7.9%
Monroe County (this page) 178 14.6%

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 Monroe 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 Monroe County, both outside Missouri so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside MO (178 bridges here).

Similar average build year

Nearest mean year-built outside MO (1974 here).

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

All 178 Good 53 Fair 99 Poor 26

Good-condition bridges (53)

COUNTY RD 1061

Good

Over: REESE FK BR

S 27 T 53 N R 12 W, Monroe, MO

Built 1988 Load: 8.1 t ADT: 35

RT D E

Good

Over: LONG BR CR

S 18 T 53 N R 8 W, Monroe, MO

Built 1964 Load: 16.2 t ADT: 269

RT Z S

Good

Over: LONG BR

S 26 T 53 N R 9 W, Monroe, MO

Built 1969 Load: 18.9 t ADT: 125

RT FF E

Good

Over: N FK SALT RVR

S 33 T 56 N R 9 W, Monroe, MO

Built 1977 Load: 20.7 t ADT: 75

US 24 E

Good

Over: MID FK SALT RVR

S 10 T 54 N R 10 W, Monroe, MO

Built 1967 Load: 24.3 t ADT: 1,296

MO 151 S

Good

Over: ELK FK SALT RVR

S 23 T 54 N R 12 W, Monroe, MO

Built 1973 Load: 25.2 t ADT: 724

US 24 E

Good

Over: INDIAN CR

S 3 T 55 N R 8 W, Monroe, MO

Built 1984 Load: 25.2 t ADT: 1,781

RT YY E

Good

Over: MILLIGAN CR

S 33 T 54 N R 12 W, Monroe, MO

Built 1960 Load: 26.1 t ADT: 102

COUNTY RD 1033

Good

Over: ELK FK SALT RVR

S 20 T 54 N R 12 W, Monroe, MO

Built 1991 Load: 27.0 t ADT: 20

MO 151 S

Good

Over: REESE FK OF SALT R

S 14 T 53 N R 12 W, Monroe, MO

Built 2011 Load: 31.5 t ADT: 533

COUNTY RD 959

Good

Over: LONG BRANCH CR

S 20 T 53 N R 11 W, Monroe, MO

Built 1992 Load: 32.4 t ADT: 50

COUNTY RD 1043

Good

Over: ELK FK SALT RVR

S 28 T 54 N R 12 W, Monroe, MO

Built 1990 Load: 32.4 t ADT: 35

COUNTY RD 325

Good

Over: CROOKED CR

S 5 T 55 N R 9 W, Monroe, MO

Built 1995 Load: 32.4 t ADT: 20

COUNTY RD 311

Good

Over: CLEAR CR

S 27 T 56 N R 10 W, Monroe, MO

Built 1989 Load: 32.4 t ADT: 25

COUNTY RD 436

Good

Over: BR MID FK SALT RVR

S 1 T 54 N R 10 W, Monroe, MO

Built 2010 Load: 32.4 t ADT: 45

COUNTY RD 739

Good

Over: MATTS BR

S 30 T 53 N R 9 W, Monroe, MO

Built 2012 Load: 32.4 t ADT: 15

COUNTY RD 286

Good

Over: DUNCAN CR

S 29 T 56 N R 10 W, Monroe, MO

Built 2012 Load: 32.4 t ADT: 15

COUNTY RD 956

Good

Over: HORNE BR

S 34 T 54 N R 11 W, Monroe, MO

Built 2012 Load: 32.4 t ADT: 15

MO 151 S

Good

Over: MIDDLE FK SALT RVR

S 26 T 55 N R 12 W, Monroe, MO

Built 2004 Load: 33.3 t ADT: 336

COUNTY RD 611

Good

Over: N BRUSH CR

S 36 T 54 N R 9 W, Monroe, MO

Built 2014 Load: 33.3 t ADT: 20

COUNTY RD 670

Good

Over: BURBRIDGE CR

S 30 T 54 N R 7 W, Monroe, MO

Built 2014 Load: 33.3 t ADT: 35

COUNTY RD 329

Good

Over: OTTER CR

S 20 T 55 N R 9 W, Monroe, MO

Built 2009 Load: 34.2 t ADT: 25

COUNTY RD 119

Good

Over: UPPER OTTER CR

S 31 T 56 N R 11 W, Monroe, MO

Built 2004 Load: 35.1 t ADT: 20

COUNTY RD 591

Good

Over: LIT INDIAN CR

S 31 T 56 N R 7 W, Monroe, MO

Built 2007 Load: 35.1 t ADT: 35

COUNTY RD 508

Good

Over: BRANCH

S 25 T 56 N R 8 W, Monroe, MO

Built 2001 Load: 36.0 t ADT: 50

COUNTY RD 983

Good

Over: BRANCH

S 10 T 54 N R 11 W, Monroe, MO

Built 2014 Load: 36.0 t ADT: 30

COUNTY RD 657

Good

Over: BR OF S FK SALT RV

S 21 T 53 N R 8 W, Monroe, MO

Built 1999 Load: 36.9 t ADT: 30

COUNTY RD 117

Good

Over: MILLIGAN CR

S 19 T 53 N R 12 W, Monroe, MO

Built 2002 Load: 36.9 t ADT: 35

RT CC E

Good

Over: BRUSH CR

S 30 T 56 N R 9 W, Monroe, MO

Built 2003 Load: 36.9 t ADT: 186

MO 15 S

Good

Over: ELK FK SALT RVR

S 23 T 54 N R 10 W, Monroe, MO

Built 1988 Load: 36.9 t ADT: 2,167

COUNTY RD 800

Good

Over: TEN MILE CR

S 25 T 53 N R 11 W, Monroe, MO

Built 2007 Load: 37.8 t ADT: 40

COUNTY RD 699

Good

Over: PURDEY CR

S 7 T 53 N R 7 W, Monroe, MO

Built 2003 Load: 38.7 t ADT: 15

COUNTY RD 781

Good

Over: BRUSH CR

S 3 T 53 N R 9 W, Monroe, MO

Built 2006 Load: 38.7 t ADT: 40

COUNTY RD 394

Good

Over: BRUSH CR

S 14 T 56 N R 10 W, Monroe, MO

Built 1999 Load: 39.6 t ADT: 25

COUNTY RD 875

Good

Over: BR ELK FK SALT RVR

S 21 T 54 N R 10 W, Monroe, MO

Built 2005 Load: 40.5 t ADT: 50

RT KK E

Good

Over: TURKEY CR

S 26 T 54 N R 10 W, Monroe, MO

Built 2005 Load: 40.5 t ADT: 109

RT AA E

Good

Over: BEE CRK

S 5 T 53 N R 10 W, Monroe, MO

Built 2024 Load: 40.5 t ADT: 204

RT A S

Good

Over: CROOKED CR

S 15 T 56 N R 11 W, Monroe, MO

Built 1993 Load: 40.5 t ADT: 159

COUNTY RD 840

Good

Over: BEE CR

S 6 T 53 N R 10 W, Monroe, MO

Built 2006 Load: 42.3 t ADT: 25

RT CC E

Good

Over: CLEAR CR

S 26 T 56 N R 10 W, Monroe, MO

Built 2012 Load: 44.1 t ADT: 186

COUNTY RD 109

Good

Over: UPPER OTTER CR

S 1 T 55 N R 12 W, Monroe, MO

Built 2016 Load: 44.1 t ADT: 25

COUNTY RD 386

Good

Over: CLEAR CR

S 22 T 56 N R 10 W, Monroe, MO

Built 1994 Load: 45.0 t ADT: 50

RT A S

Good

Over: OTTER CR

S 3 T 55 N R 11 W, Monroe, MO

Built 2007 Load: 45.9 t ADT: 137

COUNTY RD 369

Good

Over: TRIB OF INDIAN CR

S 32 T 56 N R 8 W, Monroe, MO

Built 2017 Load: 48.6 t ADT: 50

COUNTY RD 743

Good

Over: ELK FK SALT RVR

S 29 T 54 N R 9 W, Monroe, MO

Built 1999 Load: 49.5 t ADT: 40

COUNTY RD 117

Good

Over: FLAT CR

S 25 T 55 N R 12 W, Monroe, MO

Built 2011 Load: 50.4 t ADT: 15

RT C S

Good

Over: LONG BR CR

S 27 T 53 N R 11 W, Monroe, MO

Built 2007 Load: 51.3 t ADT: 251

MO 151 S

Good

Over: FLAT CR

S 1 T 54 N R 12 W, Monroe, MO

Built 1999 Load: 52.2 t ADT: 459

BRIDGE ST

Good

Over: MID FK OF SALT RVR

S 11 T 54 N R 10 W, Monroe, MO

Built 2019 Load: 52.2 t ADT: 200

COUNTY RD 875

Good

Over: ELK FORK SALT RVR

S 28 T 54 N R 10 W, Monroe, MO

Built 2009 Load: 61.2 t ADT: 30

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.