County profile · official public datasets

Osage County, OK

366 public highway bridges tracked in the FHWA National Bridge Inventory: 38.3% rated Good, 41.8% Fair, 19.9% Poor.

366
Public bridges: 38.3%
Good condition: 19.9%
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.

74th
of 77 on Poor share: 19.9%
Poor-condition share: 366
public highway bridges: 1966
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 #74 of 77 Oklahoma counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 19.9%). Osage County, Oklahoma contains 366 public highway bridges. Roughly 38.3% are rated “Good,” 41.8% “Fair,” and 19.9% “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

366

Public highway bridges in Osage County

Good condition

38.3%

140 of 366 rated 7-9

Fair condition

41.8%

153 of 366 rated 5-6

Poor condition

19.9%

73 of 366 rated 4 or below

In-state Poor-share rank

#74 of 77

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

Condition distribution

Share of 366 NBI-tracked bridges by lowest applicable component rating.

Good

38.3% (140)

Fair

41.8% (153)

Poor

19.9% (73)

Osage County's Poor-condition bridges carry 9,732 vehicle crossings a day

That is 3.1% of the county's reported daily bridge traffic on 19.9% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 133 crossings a day against 1,201 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 366 of 366 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

60.4% of Osage County's bridges have passed the 50-year mark

221 of the 366 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 38.3% 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 11.8% of the county's Poor-condition bridge traffic

N3744 (OLD S.H. 99 over SOLDIER CREEK, built 1940, carries 1,150 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 73-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 9,732 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1910s

4
1920s

14
1930s

84
1940s

48
1950s

21
1960s

33
1970s

30
1980s

32
1990s

23
2000s

36
2010s

32
2020s

9

What this shows Construction peaked in the 1930s, when 84 of the county's bridges still in the inventory were built, which is 23% of those with a recorded year. That cohort is now 85 to 94 years old in the 2024 inventory. Its average build year is 1966, 11 years older than the Oklahoma average of 1977.

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

The 5 Oklahoma counties nearest Osage County in number of bridges, with their condition splits. Its 19.9% Poor share is the 6th-lowest of these 6. Its average build year of 1966 against a peer-group mean of 1983 is 17 years older.

Showing the 5 closest of 76 Oklahoma counties eligible for comparison.

Bridge inventory size and condition shares for Osage County and the 5 Oklahoma counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Alfalfa County	387	27.4%	66.1%	6.5%	1988
Custer County	384	73.2%	25.5%	1.3%	1982
Payne County	384	24%	65.6%	10.4%	1982
Stephens County	382	29.1%	68.1%	2.9%	1985
Osage County (this page)	366	38.3%	41.8%	19.9%	1966
Washita County	361	70.1%	26.3%	3.6%	1976

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

Similar inventory size

Nearest county inventories outside OK (366 bridges here).

Lorain County, OH · 366 bridges
Allen County, OH · 367 bridges
Clackamas County, OR · 367 bridges
Centre County, PA · 367 bridges

Similar average build year

Nearest mean year-built outside OK (1966 here).

Butler County, KS · avg 1966 · 591 bridges
Grafton County, NH · avg 1966 · 544 bridges
Queens County, NY · avg 1966 · 514 bridges
Lehigh County, PA · avg 1966 · 381 bridges

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

All 366 Good 140 Fair 153 Poor 73

Poor-condition bridges (73)

Sort:

Osage County Bridge Snapshot

Condition distribution

Osage County's Poor-condition bridges carry 9,732 vehicle crossings a day

60.4% of Osage County's bridges have passed the 50-year mark

One structure carries 11.8% of the county's Poor-condition bridge traffic

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

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Poor-condition bridges (73)

D0230

IRR FAS 5755

5736C

N3925

5788C

D3910

N3700

N3810

D0150

5746C

N3820

5710C (SHELL CR RD

N3810

E0170

IRR 5782C

E0300

5732C

D3825

D3685

CR4725

5748C

E0150

FAS 5748

5704C

IRR 5718C

N3705

5754C

D0030

IRR D3676

5756C

5746C

5732C

5714C

N3745

FAS 5754

D0230

5720C

N3888

5706C

5726C

5702C

E0175

E0342

D3685

E0300

E0120

D3810

N3744 (OLD S.H. 99

N3530

FAS 5754

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