County profile · official public datasets

Grant County, OK

476 public highway bridges tracked in the FHWA National Bridge Inventory: 28.2% rated Good, 64.5% Fair, 7.4% Poor.

476
Public bridges
28.2%
Good condition
7.4%
Poor condition

The verdict

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

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

47th
of 77 on Poor share
7.4%
Poor-condition share
476
public highway bridges
1988
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.

Grant County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Grant County ranks #47 of 77 Oklahoma counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 7.4%). Grant County, Oklahoma contains 476 public highway bridges. Roughly 28.2% are rated “Good,” 64.5% “Fair,” and 7.4% “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

476

Public highway bridges in Grant County

Good condition

28.2%

134 of 476 rated 7-9

Fair condition

64.5%

307 of 476 rated 5-6

Poor condition

7.4%

35 of 476 rated 4 or below

In-state Poor-share rank

#47 of 77

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

Condition distribution

Share of 476 NBI-tracked bridges by lowest applicable component rating.

Good
28.2% (134)
Fair
64.5% (307)
Poor
7.4% (35)

Grant County's Poor-condition bridges carry 1,731 vehicle crossings a day

That is 1.6% of the county's reported daily bridge traffic on 7.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 49 crossings a day against 394 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 476 of 476 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

29% of Grant County's bridges have passed the 50-year mark

138 of the 476 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 28.2% 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 26% of the county's Poor-condition bridge traffic

N2920 over CREEK, built 1995, carries 450 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 1,731 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Grant County's bridges were built

476 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 2010s, when 118 of the county's bridges still in the inventory were built, which is 24.8% of those with a recorded year. That cohort is now 5 to 14 years old in the 2024 inventory. Its average build year is 1988, 11 years newer than the Oklahoma average of 1977.

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

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

The 5 Oklahoma counties nearest Grant County in number of bridges, with their condition splits. Its 7.4% Poor share is the 4th-lowest of these 6. Its average build year of 1988 against a peer-group mean of 1976 is 12 years newer.

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

Bridge inventory size and condition shares for Grant County and the 5 Oklahoma counties closest to it in inventory size
County Bridges Poor
Canadian County 493 3.4%
Kiowa County 477 2.9%
Grant County (this page) 476 7.4%
Le Flore County 469 11.3%
Lincoln County 450 13.3%
Grady County 449 7.1%

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

Similar inventory size

Nearest county inventories outside OK (476 bridges here).

Similar average build year

Nearest mean year-built outside OK (1988 here).

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

All 476 Good 134 Fair 307 Poor 35

All bridges (476)

E0180

Poor

Over: OSAGE CREEK

2.8W 4S .1W OF SH11/US81, Grant, OK

Built 1950 Load: 0.0 t ADT: 24

E0250

Poor

Over: CREEK

.3N2.1E1N1.6 OF SALT FORK, Grant, OK

Built 1950 Load: 0.0 t ADT: 100

E0160

Poor

Over: POND CREEK

2.S 5.2E OF SH11/SH11A, Grant, OK

Built 1950 Load: 0.0 t ADT: 24

N2820

Poor

Over: SAND CREEK

3.7E 3.4S OF NASH, Grant, OK

Built 1950 Load: 0.0 t ADT: 24

E0010

Poor

Over: CHIKASKIA RIVER

.2N9.7E5N.8E OF RENFROW, Grant, OK

Built 1950 Load: 0.0 t ADT: 50

N3020

Poor

Over: CREEK

2.8 W .9 N OF SH 74, Grant, OK

Built 1951 Load: 0.0 t ADT: 100

N3050

Poor

Over: CREEK

1W 2.2S OF SH74/SH11, Grant, OK

Built 1952 Load: 0.0 t ADT: 24

E0270

Poor

Over: CREEK

3S 4.9E OF POND CREEK, Grant, OK

Built 1955 Load: 0.0 t ADT: 24

E0080

Poor

Over: DEER CREEK

1.8S 4.5E OF RENFROW, Grant, OK

Built 1955 Load: 0.0 t ADT: 24

E0210

Poor

Over: POND CREEK

.2E .8S .9E OF JEFFERSON, Grant, OK

Built 1950 Load: 0.0 t ADT: 24

N3100

Poor

Over: CREEK

.4N2.2E2.7NOF DEER CREEK, Grant, OK

Built 1950 Load: 0.0 t ADT: 24

N2770

Poor

Over: SAND CREEK

6N 2W 2.2N OF SH132/SH11, Grant, OK

Built 2000 Load: 0.0 t ADT: 24

E0270

Poor

Over: CREEK

5.7E 3.2S OF POND CREEK, Grant, OK

Built 1945 Load: 2.7 t ADT: 24

N2990

Poor

Over: BULLWACKER CREEK

.3N 3.2E 5.5S OF MEDFORD, Grant, OK

Built 1950 Load: 2.7 t ADT: 24

E0200

Poor

Over: BOGGY CREEK

6S .7E OF SH11/SH74, Grant, OK

Built 1950 Load: 2.7 t ADT: 25

E0030

Poor

Over: WOLF CREEK

.3W 3.2N 3.9W OF RENFROW, Grant, OK

Built 1940 Load: 5.4 t ADT: 30

N3010

Poor

Over: CREEK

.2N 2.9W OF SALT FORK, Grant, OK

Built 1955 Load: 5.4 t ADT: 50

E0060

Poor

Over: CREEK

2.5W 3N .2W OF WAKITA, Grant, OK

Built 1945 Load: 6.4 t ADT: 24

E0160

Poor

Over: BIG ANTELOPE CREEK

2S .2W OF SH11/SH74, Grant, OK

Built 1960 Load: 8.2 t ADT: 50

E0250

Poor

Over: CREEK

1.2S 5.6E OF POND CREEK, Grant, OK

Built 1987 Load: 8.2 t ADT: 75

E0170

Poor

Over: POND CREEK

4.8W 3S .4W OF SH11/US81, Grant, OK

Built 1996 Load: 8.2 t ADT: 50

E0260

Poor

Over: CREEK

.2N 4.9E OF SALT FORK, Grant, OK

Built 1936 Load: 15.4 t ADT: 75

E0040

Poor

Over: CREEK

.2N6.7E2N.1E OF RENFROW, Grant, OK

Built 1992 Load: 16.3 t ADT: 25

N3010

Poor

Over: COTTONWOOD CREEK

.3N2.8W1N2W.1SOF LAMONT, Grant, OK

Built 1990 Load: 19.1 t ADT: 24

N2920

Poor

Over: CREEK

3.7S OF POND CREEK, Grant, OK

Built 1995 Load: 19.1 t ADT: 450

E0020

Poor

Over: CREEK

.7S 4.3E OF MANCHESTER, Grant, OK

Built 1938 Load: 25.4 t ADT: 47

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.