County profile · official public datasets

Audrain County, MO

314 public highway bridges tracked in the FHWA National Bridge Inventory: 41.4% rated Good, 53.8% Fair, 4.8% Poor.

314
Public bridges
41.4%
Good condition
4.8%
Poor condition

The verdict

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

Audrain 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 17%
lowest Poor share in state
4.8%
Poor-condition share
314
public highway bridges
1987
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.

Audrain County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Audrain County ranks #19 of 115 Missouri counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.8%). Audrain County, Missouri contains 314 public highway bridges. Roughly 41.4% are rated “Good,” 53.8% “Fair,” and 4.8% “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

314

Public highway bridges in Audrain County

Good condition

41.4%

130 of 314 rated 7-9

Fair condition

53.8%

169 of 314 rated 5-6

Poor condition

4.8%

15 of 314 rated 4 or below

In-state Poor-share rank

#19 of 115

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

Condition distribution

Share of 314 NBI-tracked bridges by lowest applicable component rating.

Good
41.4% (130)
Fair
53.8% (169)
Poor
4.8% (15)

Audrain County's Poor-condition bridges carry 20,284 vehicle crossings a day

That is 10.4% of the county's reported daily bridge traffic on 4.8% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 1,352 crossings a day against 372 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 314 of 314 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

21.7% of Audrain County's bridges have passed the 50-year mark

68 of the 314 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 41.4% 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 29.7% of the county's Poor-condition bridge traffic

US 54 W over BEAVER DAM CR, built 1927, carries 6,023 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 15-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 20,284 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Audrain County's bridges were built

314 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1990s, when 89 of the county's bridges still in the inventory were built, which is 28.3% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year is 1987, 8 years newer than the Missouri average of 1979.

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

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

The 5 Missouri counties nearest Audrain County in number of bridges, with their condition splits. Its 4.8% Poor share is the 1st-lowest of these 6. Its average build year of 1987 against a peer-group mean of 1981 is 6 years newer.

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

Bridge inventory size and condition shares for Audrain County and the 5 Missouri counties closest to it in inventory size
County Bridges Poor
Bates County 319 7.2%
Audrain County (this page) 314 4.8%
Linn County 313 17.6%
Callaway County 303 6.3%
Adair County 301 6.6%
Newton County 300 6.7%

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

Similar inventory size

Nearest county inventories outside MO (314 bridges here).

Similar average build year

Nearest mean year-built outside MO (1987 here).

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

All 314 Good 130 Fair 169 Poor 15

Good-condition bridges (130)

COUNTY RD 144

Good

Over: LONG BR

S 6 T 52 N R 11 W, Audrain, MO

Built 2009 Load: 37.8 t ADT: 50

COUNTY RD 140

Good

Over: SALING CR

S 9 T 52 N R 12 W, Audrain, MO

Built 2003 Load: 38.7 t ADT: 35

COUNTY RD 472

Good

Over: MID LICK CR

S 10 T 52 N R 7 W, Audrain, MO

Built 2005 Load: 38.7 t ADT: 35

COUNTY RD 541

Good

Over: HICKORY CR

S 26 T 52 N R 6 W, Audrain, MO

Built 2000 Load: 39.6 t ADT: 50

MO 15 S

Good

Over: SKULL LICK CR

S 3 T 51 N R 9 W, Audrain, MO

Built 2006 Load: 39.6 t ADT: 2,945

COUNTY RD 591

Good

Over: SHADY CR

S 14 T 52 N R 5 W, Audrain, MO

Built 2007 Load: 39.6 t ADT: 50

MO 15 S

Good

Over: LONG BR

S 34 T 53 N R 10 W, Audrain, MO

Built 2011 Load: 39.6 t ADT: 1,300

RT J E

Good

Over: MID LICK CR

S 15 T 52 N R 7 W, Audrain, MO

Built 2021 Load: 39.6 t ADT: 702

COUNTY RD 161

Good

Over: SALING CR

S 33 T 52 N R 12 W, Audrain, MO

Built 1994 Load: 40.5 t ADT: 40

COUNTY RD 148

Good

Over: LONG BR CR

S 6 T 52 N R 11 W, Audrain, MO

Built 2001 Load: 40.5 t ADT: 35

COUNTY RD 937

Good

Over: SCATTERING FK SAL

S 7 T 50 N R 9 W, Audrain, MO

Built 1993 Load: 40.5 t ADT: 35

COUNTY RD 373

Good

Over: YOUNGS CR

S 4 T 52 N R 9 W, Audrain, MO

Built 1997 Load: 40.5 t ADT: 50

COUNTY RD 480

Good

Over: TRIB OF W LICK CR

S 6 T 52 N R 7 W, Audrain, MO

Built 2002 Load: 40.5 t ADT: 35

COUNTY RD 373

Good

Over: FISH BR

S 28 T 52 N R 9 W, Audrain, MO

Built 2002 Load: 40.5 t ADT: 10

COUNTY RD 214

Good

Over: TRIB OF YOUNGS CR

S 1 T 51 N R 11 W, Audrain, MO

Built 2003 Load: 40.5 t ADT: 25

COUNTY RD 241

Good

Over: TRIB LONG BR CR

S 35 T 53 N R 11 W, Audrain, MO

Built 2004 Load: 40.5 t ADT: 15

COUNTY RD 918

Good

Over: POSSUM WALK CREEK

S 29 T 51 N R 10 W, Audrain, MO

Built 2009 Load: 40.5 t ADT: 35

COUNTY RD 116

Good

Over: BR OF SALING CR

S 19 T 52 N R 12 W, Audrain, MO

Built 2003 Load: 41.4 t ADT: 75

COUNTY RD 408

Good

Over: MAMS SLU

S 23 T 51 N R 7 W, Audrain, MO

Built 2005 Load: 41.4 t ADT: 30

COUNTY ROAD 709

Good

Over: WEST FORK CUIVRE R

S 6 T 50 N R 7 W, Audrain, MO

Built 2023 Load: 41.4 t ADT: 50

US 54 E

Good

Over: W FK CUIVRE RVR

S 29 T 51 N R 7 W, Audrain, MO

Built 1956 Load: 41.4 t ADT: 4,412

COUNTY RD 373

Good

Over: SKULL LICK CR

S 4 T 51 N R 9 W, Audrain, MO

Built 2010 Load: 42.3 t ADT: 50

COUNTY ROAD 525

Good

Over: BEAR SLU HICKORY C

S 32 T 52 N R 6 W, Audrain, MO

Built 2023 Load: 42.3 t ADT: 25

COUNTY RD 535

Good

Over: S FK OF SALT RVR

S 31 T 53 N R 8 W, Audrain, MO

Built 2003 Load: 43.2 t ADT: 50

COUNTY RD 133

Good

Over: BR OF LONG BR

S 36 T 53 N R 12 W, Audrain, MO

Built 2005 Load: 43.2 t ADT: 35

COUNTY RD 975

Good

Over: DAVIS CR

S 17 T 50 N R 10 W, Audrain, MO

Built 2005 Load: 43.2 t ADT: 35

COUNTY RD 472

Good

Over: W LICK CR

S 8 T 52 N R 7 W, Audrain, MO

Built 2007 Load: 43.2 t ADT: 35

MO 22 E

Good

Over: NS RR

S 31 T 52 N R 12 W, Audrain, MO

Built 1997 Load: 43.2 t ADT: 4,199

COUNTY RD 395

Good

Over: FISH BR

S 23 T 52 N R 10 W, Audrain, MO

Built 1995 Load: 44.1 t ADT: 50

COUNTY RD 556

Good

Over: BR OF MID LICK CR

S 12 T 52 N R 7 W, Audrain, MO

Built 1996 Load: 44.1 t ADT: 50

COUNTY RD 581

Good

Over: SHADY CR

S 16 T 52 N R 5 W, Audrain, MO

Built 2000 Load: 44.1 t ADT: 75

COUNTY RD 691

Good

Over: SANDY CR

S 23 T 51 N R 5 W, Audrain, MO

Built 1996 Load: 44.1 t ADT: 50

COUNTY RD 433

Good

Over: WILDCAT CR

S 3 T 51 N R 8 W, Audrain, MO

Built 1994 Load: 44.1 t ADT: 75

MO 15 S

Good

Over: DAVIS FK SALT RVR

S 23 T 51 N R 9 W, Audrain, MO

Built 2001 Load: 44.1 t ADT: 2,945

COUNTY RD 316

Good

Over: BIG BR SCULL LICK

S 12 T 51 N R 10 W, Audrain, MO

Built 2008 Load: 44.1 t ADT: 35

COUNTY RD 919

Good

Over: SCATTERING FK

S 9 T 50 N R 9 W, Audrain, MO

Built 2014 Load: 44.1 t ADT: 50

COUNTY RD 756

Good

Over: BR OF LOUTRE RVR

S 33 T 50 N R 7 W, Audrain, MO

Built 1997 Load: 45.0 t ADT: 75

COUNTY RD 814

Good

Over: STR FEEDING TEAL L

S 2 T 50 N R 9 W, Audrain, MO

Built 2004 Load: 45.0 t ADT: 835

COUNTY RD 844

Good

Over: S FK SALT RVR

S 30 T 50 N R 8 W, Audrain, MO

Built 2005 Load: 45.0 t ADT: 150

COUNTY RD 657

Good

Over: TRIB OF HICKORY CR

S 19 T 51 N R 5 W, Audrain, MO

Built 2007 Load: 45.0 t ADT: 100

COUNTY RD 448

Good

Over: LITTLEBY CR

S 26 T 52 N R 8 W, Audrain, MO

Built 2013 Load: 45.0 t ADT: 35

COUNTY RD 625

Good

Over: QUIVRE RVR

S 8 T 51 N R 6 W, Audrain, MO

Built 2016 Load: 45.0 t ADT: 50

COUNTY RD 812

Good

Over: LONG BRANCH CR

S 6 T 50 N R 8 W, Audrain, MO

Built 2010 Load: 45.9 t ADT: 35

COUNTY RD 716

Good

Over: TRIB W FK CUIVRE R

S 1 T 50 N R 8 W, Audrain, MO

Built 2012 Load: 45.9 t ADT: 75

COUNTY RD 556

Good

Over: BR OF E LICK CR

S 7 T 52 N R 6 W, Audrain, MO

Built 1993 Load: 46.8 t ADT: 50

COUNTY RD 154

Good

Over: SALING CR

S 33 T 53 N R 12 W, Audrain, MO

Built 2002 Load: 46.8 t ADT: 75

COUNTY RD 126

Good

Over: LONG BR CR

S 18 T 52 N R 11 W, Audrain, MO

Built 2002 Load: 47.7 t ADT: 35

COUNTY RD 234

Good

Over: YOUNGS CR

S 29 T 52 N R 10 W, Audrain, MO

Built 2009 Load: 47.7 t ADT: 50

COUNTY RD 256

Good

Over: YOUNGS CR

S 9 T 52 N R 10 W, Audrain, MO

Built 2011 Load: 47.7 t ADT: 35

COUNTY RD 951

Good

Over: TRIB OF DAVIS CR

S 35 T 51 N R 10 W, Audrain, MO

Built 2008 Load: 48.6 t ADT: 75

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.