County profile · official public datasets

Seminole County, OK

298 public highway bridges tracked in the FHWA National Bridge Inventory: 38.6% rated Good, 49.7% Fair, 11.7% Poor.

298
Public bridges
38.6%
Good condition
11.7%
Poor condition

The verdict

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

Seminole 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.

64th
of 77 on Poor share
11.7%
Poor-condition share
298
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.

Seminole County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Seminole County ranks #64 of 77 Oklahoma counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 11.7%). Seminole County, Oklahoma contains 298 public highway bridges. Roughly 38.6% are rated “Good,” 49.7% “Fair,” and 11.7% “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

298

Public highway bridges in Seminole County

Good condition

38.6%

115 of 298 rated 7-9

Fair condition

49.7%

148 of 298 rated 5-6

Poor condition

11.7%

35 of 298 rated 4 or below

In-state Poor-share rank

#64 of 77

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

Condition distribution

Share of 298 NBI-tracked bridges by lowest applicable component rating.

Good
38.6% (115)
Fair
49.7% (148)
Poor
11.7% (35)

Seminole County's Poor-condition bridges carry 26,155 vehicle crossings a day

That is 5.4% of the county's reported daily bridge traffic on 11.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 747 crossings a day against 2,188 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 298 of 298 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

61.4% of Seminole County's bridges have passed the 50-year mark

183 of the 298 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 38.6% 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 28.3% of the county's Poor-condition bridge traffic

U.S. 270 over CREEK, built 1943, carries 7,400 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 35-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 26,155 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Seminole County's bridges were built

298 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1930s, when 58 of the county's bridges still in the inventory were built, which is 19.5% of those with a recorded year. That cohort is now 85 to 94 years old in the 2024 inventory. Its average build year is 1966, 11 years older than the Oklahoma average of 1977.

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

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

The 5 Oklahoma counties nearest Seminole County in number of bridges, with their condition splits. Its 11.7% Poor share is the 5th-lowest of these 6. Its average build year of 1966 against a peer-group mean of 1976 is 10 years older.

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

Bridge inventory size and condition shares for Seminole County and the 5 Oklahoma counties closest to it in inventory size
County Bridges Poor
Okmulgee County 310 17.4%
Woods County 310 3.9%
Seminole County (this page) 298 11.7%
Kingfisher County 297 6.7%
Jackson County 292 2.4%
Bryan County 286 9.8%

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

Similar inventory size

Nearest county inventories outside OK (298 bridges here).

Similar average build year

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

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

All 298 Good 115 Fair 148 Poor 35

Good-condition bridges (115)

N3560

Good

Over: CREEK

2.3 S OF WOLF, Seminole, OK

Built 1927 Load: 19.1 t ADT: 100

N3670

Good

Over: CREEK

.4 N & 1 W OF SCHOOLTON, Seminole, OK

Built 1938 Load: 19.1 t ADT: 75

E1270

Good

Over: CREEK

2 N & .5 W OF BOWLEGS, Seminole, OK

Built 1938 Load: 19.1 t ADT: 100

N3650

Good

Over: CREEK

6.3 N & .8 E OF SASAKWA, Seminole, OK

Built 1940 Load: 19.1 t ADT: 100

6704C

Good

Over: CREEK

2.5N & 2.1W OF CROMWELL, Seminole, OK

Built 1940 Load: 19.1 t ADT: 260

E1310

Good

Over: CREEK

3 S & .8 E OF WEWOKA, Seminole, OK

Built 1940 Load: 19.1 t ADT: 60

N3520

Good

Over: CREEK

2.8 S & 4 W OF WOLF, Seminole, OK

Built 1942 Load: 19.1 t ADT: 100

6782C

Good

Over: CREEK

1.9 N OF WEWOKA, Seminole, OK

Built 1946 Load: 19.1 t ADT: 245

6766C

Good

Over: CREEK

.2 N & .5 E OF KONAWA, Seminole, OK

Built 1940 Load: 19.1 t ADT: 600

S.H. 9

Good

Over: CREEK

3.4 MI W JCT SH 56, Seminole, OK

Built 1938 Load: 19.6 t ADT: 1,200

S.H. 56

Good

Over: CREEK

2.9 MI N JCT US 270BU, Seminole, OK

Built 1969 Load: 19.8 t ADT: 1,900

CO. RD.

Good

Over: I-40 UNDER

17 MI E POTT. C/L, Seminole, OK

Built 1964 Load: 20.1 t ADT: 75

CO. RD.

Good

Over: I-40 UNDER

2 MI E POTT CO, Seminole, OK

Built 1963 Load: 20.8 t ADT: 75

I-40

Good

Over: TURKEY CREEK

7.8 MI E POTT CO, Seminole, OK

Built 1963 Load: 23.0 t ADT: 7,550

U.S. 270

Good

Over: CREEK

4.9 MI E SH 3, Seminole, OK

Built 1953 Load: 23.1 t ADT: 6,200

I-40

Good

Over: CO. RD. UNDER

5 MI E POTT CO, Seminole, OK

Built 1964 Load: 24.3 t ADT: 8,900

S.H. 56

Good

Over: CREEK

0.4 MI W SASAKWA, Seminole, OK

Built 1974 Load: 24.4 t ADT: 1,200

S.H. 99A

Good

Over: SNAKE CREEK

4.8 MI E JCT SH 99, Seminole, OK

Built 1952 Load: 24.5 t ADT: 960

S.H. 59

Good

Over: CREEK

4.4 MI E JCT SH 99, Seminole, OK

Built 1955 Load: 25.1 t ADT: 1,500

CO. RD.

Good

Over: I-40 WB UNDER

14 MI E POTT CO, Seminole, OK

Built 1964 Load: 25.3 t ADT: 75

CO. RD.

Good

Over: I-40 EB UNDER

14 MI E POTT CO, Seminole, OK

Built 1964 Load: 25.3 t ADT: 75

U.S. 270

Good

Over: CREEK

1.4 MI E POTT CO, Seminole, OK

Built 1948 Load: 25.6 t ADT: 4,100

U.S. 270

Good

Over: CREEK

6.2 MI SE SH 3, Seminole, OK

Built 1927 Load: 26.6 t ADT: 6,200

S.H. 56

Good

Over: LITTLE RIVER

1.2 MI N SASAKWA, Seminole, OK

Built 1990 Load: 27.9 t ADT: 820

CO. RD.

Good

Over: I-40 EB UNDER

9 MI E POTT CO, Seminole, OK

Built 1963 Load: 28.2 t ADT: 100

CO. RD.

Good

Over: I-40 WB UNDER

9 MI E POTT CO, Seminole, OK

Built 1963 Load: 28.2 t ADT: 101

S.H. 3E

Good

Over: JUMPER CREEK

0.9 MI N PONTOTOC CO, Seminole, OK

Built 1968 Load: 29.1 t ADT: 4,700

S.H. 56

Good

Over: LITTLE RIVER OFLOW

1.5 MI N SASAKWA, Seminole, OK

Built 1990 Load: 29.8 t ADT: 820

I-40

Good

Over: CO. RD. UNDER

12 MI E POTT CO, Seminole, OK

Built 1963 Load: 30.2 t ADT: 7,650

I-40

Good

Over: CO. RD. UNDER

12 MI E POTT CO, Seminole, OK

Built 1963 Load: 30.2 t ADT: 7,550

CO. RD.

Good

Over: I-40 UNDER

10 MI E POTT CO, Seminole, OK

Built 1963 Load: 30.8 t ADT: 101

N3530

Good

Over: TURKEY CREEK

2.9 S & 3 W OF LITTLE, Seminole, OK

Built 1999 Load: 30.8 t ADT: 100

E1140

Good

Over: CREEK

1.5 N & .1 W OF CROMWELL, Seminole, OK

Built 2002 Load: 30.8 t ADT: 100

S.H. 56

Good

Over: SAND CREEK

2.4 MI N JCT SH 99A, Seminole, OK

Built 1972 Load: 31.0 t ADT: 1,400

N3570

Good

Over: SALT CREEK TRIB.

1.3 S & 1 E OF WOLF, Seminole, OK

Built 2004 Load: 31.8 t ADT: 100

S.H. 3E

Good

Over: TURKEY CREEK

2.9 MI SE POTT. C/L, Seminole, OK

Built 1985 Load: 32.4 t ADT: 5,000

S.H. 9 A

Good

Over: CREEK

10.8 MI S JCT SH 59, Seminole, OK

Built 1918 Load: 32.7 t ADT: 810

S.H. 56

Good

Over: CREEK

2.6 MI N JCT SH 9, Seminole, OK

Built 1918 Load: 32.7 t ADT: 1,300

I-40

Good

Over: CO. RD. UNDER

4 MI E POTT CO, Seminole, OK

Built 1963 Load: 32.7 t ADT: 8,900

I-40

Good

Over: CREEK

2.5 MI E POTT CO, Seminole, OK

Built 1963 Load: 32.7 t ADT: 8,900

I-40

Good

Over: CREEK

2.5 MI E POTT CO, Seminole, OK

Built 1963 Load: 32.7 t ADT: 8,900

S.H. 99

Good

Over: MAGNOLIA CREEK

1.2 MI N JCT US 270, Seminole, OK

Built 1965 Load: 32.7 t ADT: 14,400

S.H. 99

Good

Over: HAZEL CREEK

0.7 MI S JCT SH 99A, Seminole, OK

Built 1980 Load: 32.7 t ADT: 6,900

S.H. 56

Good

Over: LITTLE WEWOKA CREEK

5 MI N JCT SH 9, Seminole, OK

Built 1989 Load: 32.7 t ADT: 1,200

N3620

Good

Over: SNAKE CREEK

.4 N OF SYLVIAN, Seminole, OK

Built 1991 Load: 32.7 t ADT: 100

S.H. 56

Good

Over: CREEK

1.0 MI. S. OF U.S. 270, Seminole, OK

Built 2009 Load: 32.7 t ADT: 1,300

IRR N3600 (6769C)

Good

Over: CREEK

3S 4E of LITTLE, Seminole, OK

Built 2019 Load: 32.7 t ADT: 555

E1235

Good

Over: CREEK

4W OF SEMINOLE, Seminole, OK

Built 2017 Load: 32.7 t ADT: 50

S.H. 56

Good

Over: CREEK

3.7 MI N JCT SH 9, Seminole, OK

Built 1932 Load: 32.9 t ADT: 1,300

S.H. 99A

Good

Over: CREEK

0.4 MI E JCT SH 99, Seminole, OK

Built 1934 Load: 33.4 t ADT: 960

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.