County profile · official public datasets

Logan County, OK

284 public highway bridges tracked in the FHWA National Bridge Inventory: 24.3% rated Good, 55.6% Fair, 20.1% Poor.

284
Public bridges
24.3%
Good condition
20.1%
Poor condition

The verdict

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

Logan County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

75th
of 77 on Poor share
20.1%
Poor-condition share
284
public highway bridges
1973
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.

Logan County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Logan County ranks #75 of 77 Oklahoma counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 20.1%). Logan County, Oklahoma contains 284 public highway bridges. Roughly 24.3% are rated “Good,” 55.6% “Fair,” and 20.1% “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

284

Public highway bridges in Logan County

Good condition

24.3%

69 of 284 rated 7-9

Fair condition

55.6%

158 of 284 rated 5-6

Poor condition

20.1%

57 of 284 rated 4 or below

In-state Poor-share rank

#75 of 77

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

Condition distribution

Share of 284 NBI-tracked bridges by lowest applicable component rating.

Good
24.3% (69)
Fair
55.6% (158)
Poor
20.1% (57)

Logan County's Poor-condition bridges carry 5,291 vehicle crossings a day

That is 1.2% of the county's reported daily bridge traffic on 20.1% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 93 crossings a day against 1,824 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 284 of 284 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

49.3% of Logan County's bridges have passed the 50-year mark

140 of the 284 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 24.3% 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 9.5% of the county's Poor-condition bridge traffic

E0740 (OLD S.H. 33 over FITZGERALD CREEK, built 1927, carries 500 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 57-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 5,291 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Logan County's bridges were built

284 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1950s, when 53 of the county's bridges still in the inventory were built, which is 18.7% of those with a recorded year. That cohort is now 65 to 74 years old in the 2024 inventory. Its average build year (1973) matches the Oklahoma average (1977).

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

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

The 5 Oklahoma counties nearest Logan County in number of bridges, with their condition splits. Its 20.1% Poor share is the 6th-lowest of these 6. Its average build year of 1973 against a peer-group mean of 1971 is in line with the group.

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

Bridge inventory size and condition shares for Logan County and the 5 Oklahoma counties closest to it in inventory size
County Bridges Poor
Jackson County 292 2.4%
Bryan County 286 9.8%
Tillman County 284 2.5%
Logan County (this page) 284 20.1%
Blaine County 272 7%
Rogers County 272 9.2%

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

Similar inventory size

Nearest county inventories outside OK (284 bridges here).

Similar average build year

Nearest mean year-built outside OK (1973 here).

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

All 284 Good 69 Fair 158 Poor 57

All bridges (284)

E0640

Poor

Over: CREEK

1E 1.5N 1.3E OF MULHALL, Logan, OK

Built 1950 Load: 8.2 t ADT: 100

N3160

Poor

Over: PEAVINE CREEK

2.5E .1N OF I35/WATERLOO, Logan, OK

Built 1984 Load: 10.0 t ADT: 250

E0750

Poor

Over: CREEK

1.2S 4.6E OF LANGSTON, Logan, OK

Built 1940 Load: 10.9 t ADT: 100

N3110

Poor

Over: CREEK

.3S 5.6W .5N OF ORLANDO, Logan, OK

Built 1929 Load: 12.2 t ADT: 24

N3040

Poor

Over: CREEK

2S .5E OF CRESCENT, Logan, OK

Built 1957 Load: 12.2 t ADT: 100

N3000

Poor

Over: CREEK

1.2W 2.3S OF LOVELL, Logan, OK

Built 1940 Load: 12.6 t ADT: 100

E0610

Poor

Over: EAST BEAVER CREEK

.4S .7W 1S .1W OF ORLANDO, Logan, OK

Built 1936 Load: 12.7 t ADT: 100

E0810

Poor

Over: GRANT CREEK

.1S 1.1E OF MERIDIAN, Logan, OK

Built 1950 Load: 12.7 t ADT: 24

N3170

Poor

Over: CREEK

3.5E .3S OF I-35 & SEWARD, Logan, OK

Built 1940 Load: 12.7 t ADT: 100

E0820

Poor

Over: CREEK

3S .3 W OF SH33/SH74, Logan, OK

Built 1991 Load: 13.2 t ADT: 25

N3160

Poor

Over: CREEK

2.5E .8N OF I35/SEWARD RD, Logan, OK

Built 1930 Load: 13.6 t ADT: 100

N3140

Poor

Over: CREEK

.7N OF MULHALL, Logan, OK

Built 1957 Load: 13.6 t ADT: 100

E0810

Poor

Over: CREEK

2S 2.9E OF SH33/SH74, Logan, OK

Built 1950 Load: 13.7 t ADT: 50

N3210

Poor

Over: FITZGERALD CREEK

1.5W .5S OF LANGSTON, Logan, OK

Built 1921 Load: 14.0 t ADT: 24

E0630

Poor

Over: HORSE CREEK

3.5S .4W OF MARSHALL, Logan, OK

Built 1938 Load: 14.2 t ADT: 100

E0600

Poor

Over: OTTER CREEK

2N 1.8E OF SH51/SH74, Logan, OK

Built 1960 Load: 14.5 t ADT: 100

N3210

Poor

Over: COON CREEK

4.2S 2W 2.2S OF MERIDIAN, Logan, OK

Built 1970 Load: 14.6 t ADT: 100

E0590

Poor

Over: HORSE CREEK

.5N .5W OF MARSHALL, Logan, OK

Built 1925 Load: 15.4 t ADT: 300

N3150

Poor

Over: E. BRANCH BEAVER CREEK

.3S .6W .4S OF ORLANDO, Logan, OK

Built 1920 Load: 16.1 t ADT: 30

N3020

Poor

Over: COTTONWOOD CREEK

2S 3.4W OF NAVINA, Logan, OK

Built 1950 Load: 16.2 t ADT: 100

E0600

Poor

Over: OTTER CREEK

.5S 5E OF MARSHALL, Logan, OK

Built 1986 Load: 18.0 t ADT: 100

E0720

Poor

Over: CREEK

4.4E 1.2N OF CRESCENT, Logan, OK

Built 1952 Load: 18.1 t ADT: 100

N3030

Poor

Over: SPRING CREEK

1.1E 4.5S OF MARSHALL, Logan, OK

Built 1936 Load: 19.1 t ADT: 24

N3030

Poor

Over: CREEK

.5W 3.3N OF SH74/SH74C, Logan, OK

Built 2003 Load: 19.1 t ADT: 25

N3150

Poor

Over: CREEK

.2E .2S OF I-35/SH33, Logan, OK

Built 1950 Load: 20.9 t ADT: 150

N3120

Poor

Over: SKELETON CREEK

2W 5.5S OF MULHALL, Logan, OK

Built 1960 Load: 21.3 t ADT: 100

E0760

Poor

Over: CREEK

2.7S 3.5E OF CRESCENT, Logan, OK

Built 1946 Load: 21.6 t ADT: 100

E0740 (OLD S.H. 33

Poor

Over: FITZGERALD CREEK

4 MI S.W. PAYNE C/L, Logan, OK

Built 1927 Load: 21.8 t ADT: 500

TRIPLE X RD.

Poor

Over: FITZGERALD CREEK

.3 E .4 N OFCOYLE, Logan, OK

Built 1954 Load: 21.8 t ADT: 450

E0630

Poor

Over: CREEK

2.5N 1.3W OF MULHALL, Logan, OK

Built 1940 Load: 26.8 t ADT: 100

N3200

Poor

Over: FITZGERALD CREEK

2.5W 1.8S OF LANGSTON, Logan, OK

Built 1948 Load: 28.8 t ADT: 100

E0660

Poor

Over: BRIDGE CREEK

.5S 6.7W OF MULHALL, Logan, OK

Built 1920 Load: 38.1 t ADT: 100

E0640

Poor

Over: BRIDGE CREEK

2S 3.3E OF SH74/SH51, Logan, OK

Built 1960 Load: 39.6 t ADT: 100

N3030

Poor

Over: CREEK

.5W 3.7N OF SH74/SH74C, Logan, OK

Built 2003 Load: 47.2 t ADT: 25

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.