County profile · official public datasets

Osage County, MO

100 public highway bridges tracked in the FHWA National Bridge Inventory: 37% rated Good, 45% Fair, 18% Poor.

100
Public bridges: 37%
Good condition: 18%
Poor condition

The verdict

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

Osage 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.

105th
of 115 on Poor share: 18%
Poor-condition share: 100
public highway bridges: 1970
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.

Osage County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Osage County ranks #105 of 115 Missouri counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 18%). Osage County, Missouri contains 100 public highway bridges. Roughly 37% are rated “Good,” 45% “Fair,” and 18% “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

100

Public highway bridges in Osage County

Good condition

37%

37 of 100 rated 7-9

Fair condition

45%

45 of 100 rated 5-6

Poor condition

18%

18 of 100 rated 4 or below

In-state Poor-share rank

#105 of 115

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

Condition distribution

Share of 100 NBI-tracked bridges by lowest applicable component rating.

Good

37% (37)

Fair

45% (45)

Poor

18% (18)

Osage County's Poor-condition bridges carry 2,952 vehicle crossings a day

That is 2.4% of the county's reported daily bridge traffic on 18% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 164 crossings a day against 1,088 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 100 of 100 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

59% of Osage County's bridges have passed the 50-year mark

59 of the 100 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 37% 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 40.8% of the county's Poor-condition bridge traffic

RT T S over LOOSE CR, built 1966, carries 1,204 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 18-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 2,952 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

pre-1900

1
1900s

3
1910s

1
1920s

1
1930s

9
1940s

13
1950s

13
1960s

17
1970s

2
1980s

3
1990s

6
2000s

10
2010s

15
2020s

6

What this shows Construction peaked in the 1960s, when 17 of the county's bridges still in the inventory were built, which is 17% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year is 1970, 9 years older than the Missouri average of 1979.

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

The 5 Missouri counties nearest Osage County in number of bridges, with their condition splits. Its 18% Poor share is the 6th-lowest of these 6. Its average build year of 1970 against a peer-group mean of 1969 is in line with the group.

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

Bridge inventory size and condition shares for Osage County and the 5 Missouri counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Morgan County	105	28.6%	61%	10.5%	1964
Pulaski County	104	21.2%	68.3%	10.6%	1975
Ste. Genevieve County	104	38.5%	51%	10.6%	1972
Osage County (this page)	100	37%	45%	18%	1970
Mississippi County	99	26.3%	62.6%	11.1%	1969
Moniteau County	93	28%	59.1%	12.9%	1964

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

Similar inventory size

Nearest county inventories outside MO (100 bridges here).

Ketchikan Gateway County, AK · 100 bridges
Gunnison County, CO · 100 bridges
Monroe County, FL · 100 bridges
Fayette County, IN · 100 bridges

Similar average build year

Nearest mean year-built outside MO (1970 here).

Hamilton County, OH · avg 1970 · 783 bridges
Yavapai County, AZ · avg 1970 · 543 bridges
Garfield County, OK · avg 1970 · 504 bridges
San Luis Obispo County, CA · avg 1970 · 401 bridges

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

All 100 Good 37 Fair 45 Poor 18

Fair-condition bridges (45)

Sort:

Osage County Bridge Snapshot

Condition distribution

Osage County's Poor-condition bridges carry 2,952 vehicle crossings a day

59% of Osage County's bridges have passed the 50-year mark

One structure carries 40.8% of the county's Poor-condition bridge traffic

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

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Fair-condition bridges (45)

COUNTY RD 716

COUNTY RD 432

COUNTY RD 631

COUNTY RD 416

COUNTY RD 804

COUNTY RD 622

COUNTY RD 412

RT U S

RT D S

RT HH E

COUNTY RD 435

COUNTY RD 241

COUNTY RD 801

COUNTY RD 508

COUNTY RD 516

COUNTY RD 706

COUNTY RD 715

MO 89 S

MO 100 E

RT E E

MO 89 S

RT D S

RT W E

RT K S

RT NN S

RT Y S

MO 89 S

LOOSE CREEK HWY

RT C E

RT E E

MO 100 E

RT Y S

US 50 W

RT B S

US 63 S

MO 133 S

MO 89 S

RT FF S

RT P E

US 63 N

US 50 E

RT C E

US 63 S

US 50 E

US 50 E

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