County profile · official public datasets

Adair County, OK

139 public highway bridges tracked in the FHWA National Bridge Inventory: 35.3% rated Good, 50.4% Fair, 14.4% Poor.

139
Public bridges: 35.3%
Good condition: 14.4%
Poor condition

The verdict

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

Adair 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.

69th
of 77 on Poor share: 14.4%
Poor-condition share: 139
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.

Adair County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Adair County ranks #69 of 77 Oklahoma counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 14.4%). Adair County, Oklahoma contains 139 public highway bridges. Roughly 35.3% are rated “Good,” 50.4% “Fair,” and 14.4% “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

139

Public highway bridges in Adair County

Good condition

35.3%

49 of 139 rated 7-9

Fair condition

50.4%

70 of 139 rated 5-6

Poor condition

14.4%

20 of 139 rated 4 or below

In-state Poor-share rank

#69 of 77

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

Condition distribution

Share of 139 NBI-tracked bridges by lowest applicable component rating.

Good

35.3% (49)

Fair

50.4% (70)

Poor

14.4% (20)

Adair County's Poor-condition bridges carry 4,331 vehicle crossings a day

That is 2.8% of the county's reported daily bridge traffic on 14.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 217 crossings a day against 1,204 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 139 of 139 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

56.8% of Adair County's bridges have passed the 50-year mark

79 of the 139 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 35.3% 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 14.4% of the county's Poor-condition bridge traffic

E0850 (0150C) over CREEK, built 1943, carries 624 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 20-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 4,331 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

5
1930s

34
1940s

11
1950s

20
1960s

3
1970s

7
1980s

8
1990s

17
2000s

14
2010s

16
2020s

4

What this shows Construction peaked in the 1930s, when 34 of the county's bridges still in the inventory were built, which is 24.5% of those with a recorded year. That cohort is now 85 to 94 years old in the 2024 inventory. Its average build year is 1970, 7 years older than the Oklahoma average of 1977.

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

The 5 Oklahoma counties nearest Adair County in number of bridges, with their condition splits. Its 14.4% Poor share is the 6th-lowest of these 6. Its average build year of 1970 against a peer-group mean of 1975 is 5 years older.

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

Bridge inventory size and condition shares for Adair County and the 5 Oklahoma counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Jefferson County	150	46.7%	46%	7.3%	1975
Coal County	142	38.7%	54.9%	6.3%	1974
Adair County (this page)	139	35.3%	50.4%	14.4%	1970
Love County	133	42.1%	56.4%	1.5%	1977
Murray County	129	46.5%	51.2%	2.3%	1976
Harper County	128	33.6%	64.8%	1.6%	1975

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

Similar inventory size

Nearest county inventories outside OK (139 bridges here).

Bulloch County, GA · 139 bridges
St. Helena County, LA · 139 bridges
Garrett County, MD · 139 bridges
Midland County, MI · 139 bridges

Similar average build year

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

Hamilton County, OH · avg 1970 · 783 bridges
Yavapai County, AZ · avg 1970 · 543 bridges
San Luis Obispo County, CA · avg 1970 · 401 bridges
Somerset County, NJ · avg 1970 · 397 bridges

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

All 139 Good 49 Fair 70 Poor 20

Fair-condition bridges (70)

Sort:

Adair County Bridge Snapshot

Condition distribution

Adair County's Poor-condition bridges carry 4,331 vehicle crossings a day

56.8% of Adair County's bridges have passed the 50-year mark

One structure carries 14.4% of the county's Poor-condition bridge traffic

How Adair 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

Fair-condition bridges (70)

N4742 (0134C)

N4740 (0134C)

N4720

E0704

N4638 (0126C)

E0610 (0152C)

N4637 (0138C)

N4623 (0138C)

N4641 (0140C)

N4750 (0122C)

E0695

N4700

N4700

N4685 (FAS 0104)

IRR N4740 (0144C)

N4690 (0120C)

N4690 (0120C)

N4750

N4733 (0148C)

E0902 (0136C)

E0820

N4626 (FAS 0108C)

N4711 OLD U.S. 59

N4740 (0134C)

E0653 (0110C)

E0830 (0154C)

N4625 (FAS 0108)

E0740

E0700

S.H. 100

IRR E0881 (0144C)

N4630 (0124C)

U.S. 62

N4634

E0890 (0142C)

N4697

U.S. 59

N4700

E0630 (0110C)

N4742

S.H. 51

U.S. 59

E0725

U.S. 59

U.S. 62

U.S. 62

S.H. 51

S.H. 51

S.H. 51

S.H. 51

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