County profile · official public datasets

McClain County, OK

242 public highway bridges tracked in the FHWA National Bridge Inventory: 40.9% rated Good, 54.5% Fair, 4.5% Poor.

242
Public bridges: 40.9%
Good condition: 4.5%
Poor condition

The verdict

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

McClain County pairs a better-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

Top 35%
lowest Poor share in state: 4.5%
Poor-condition share: 242
public highway bridges: 1983
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.

McClain County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, McClain County ranks #27 of 77 Oklahoma counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.5%). McClain County, Oklahoma contains 242 public highway bridges. Roughly 40.9% are rated “Good,” 54.5% “Fair,” and 4.5% “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

242

Public highway bridges in McClain County

Good condition

40.9%

99 of 242 rated 7-9

Fair condition

54.5%

132 of 242 rated 5-6

Poor condition

4.5%

11 of 242 rated 4 or below

In-state Poor-share rank

#27 of 77

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

Condition distribution

Share of 242 NBI-tracked bridges by lowest applicable component rating.

Good

40.9% (99)

Fair

54.5% (132)

Poor

4.5% (11)

McClain County's Poor-condition bridges carry 23,750 vehicle crossings a day

That is 2.2% of the county's reported daily bridge traffic on 4.5% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 2,159 crossings a day against 4,621 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 242 of 242 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

35.5% of McClain County's bridges have passed the 50-year mark

86 of the 242 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 40.9% 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 62.9% of the county's Poor-condition bridge traffic

I-35 over S.H. 39 UNDER, built 1968, carries 14,950 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 11-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 23,750 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

3
1930s

14
1940s

10
1950s

20
1960s

36
1970s

6
1980s

39
1990s

42
2000s

45
2010s

18
2020s

9

What this shows Construction peaked in the 2000s, when 45 of the county's bridges still in the inventory were built, which is 18.6% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year is 1983, 6 years newer than the Oklahoma average of 1977.

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

The 5 Oklahoma counties nearest McClain County in number of bridges, with their condition splits. Its 4.5% Poor share is the 3rd-lowest of these 6. Its average build year of 1983 against a peer-group mean of 1978 is 5 years newer.

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

Bridge inventory size and condition shares for McClain County and the 5 Oklahoma counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Wagoner County	254	52.8%	40.9%	6.3%	1986
Pushmataha County	247	63.2%	32%	4.9%	1972
McClain County (this page)	242	40.9%	54.5%	4.5%	1983
Pontotoc County	241	44.8%	53.5%	1.7%	1980
Mayes County	233	39.5%	47.2%	13.3%	1975
Atoka County	232	65.1%	31.5%	3.4%	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 McClain 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 McClain County, both outside Oklahoma so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside OK (242 bridges here).

Glenn County, CA · 242 bridges
Macoupin County, IL · 242 bridges
Wabaunsee County, KS · 242 bridges
Tuscola County, MI · 242 bridges

Similar average build year

Nearest mean year-built outside OK (1983 here).

Dallas County, TX · avg 1983 · 3,230 bridges
Bexar County, TX · avg 1983 · 2,342 bridges
Sedgwick County, KS · avg 1983 · 1,333 bridges
Will County, IL · avg 1983 · 649 bridges

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

All 242 Good 99 Fair 132 Poor 11

All bridges (242)

Sort:

McClain County Bridge Snapshot

Condition distribution

McClain County's Poor-condition bridges carry 23,750 vehicle crossings a day

35.5% of McClain County's bridges have passed the 50-year mark

One structure carries 62.9% of the county's Poor-condition bridge traffic

How McClain 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

All bridges (242)

E1440

U.S. 77

U.S. 77

U.S. 77

U.S. 62

S.H. 74

BAILEY A TP (I-44)

S.H. 9

E1280

S.H. 37

S.H. 24

S.H. 24

S.H. 74B

S.H. 74B

S.H. 59

U.S. 62

BAILEY NORMAN SPUR

BAILEY NORMAN SPUR

BAILEY NORMAN SPUR

BAILEY NORMAN SPUR

S.H. 39

S.H. 24

E1400

S.H. 74B

E1330

S.H. 59

S.H. 59

S.H. 24

N3340

E1470

S.H. 74

N3070

E1460

E1420

E1240

E1430

E1420

S.H. 9

E1300 (290th)

E1410

I-35

S.H. 76

E1350

N3035

E1480

LADD RD.

S.H. 59

E1410

N3080

S.H. 59

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