County profile · official public datasets

Logan County, KY

135 public highway bridges tracked in the FHWA National Bridge Inventory: 17.8% rated Good, 78.5% Fair, 3.7% Poor.

135
Public bridges: 17.8%
Good condition: 3.7%
Poor condition

The verdict

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

Logan County posts a top-quartile lowest Poor-condition share among rated counties in the state across mid-size county bridge inventory.

Top 16%
lowest Poor share in state: 3.7%
Poor-condition share: 135
public highway bridges: 1978
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 #19 of 120 Kentucky counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 3.7%). Logan County, Kentucky contains 135 public highway bridges. Roughly 17.8% are rated “Good,” 78.5% “Fair,” and 3.7% “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

135

Public highway bridges in Logan County

Good condition

17.8%

24 of 135 rated 7-9

Fair condition

78.5%

106 of 135 rated 5-6

Poor condition

3.7%

5 of 135 rated 4 or below

In-state Poor-share rank

#19 of 120

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

Condition distribution

Share of 135 NBI-tracked bridges by lowest applicable component rating.

Good

17.8% (24)

Fair

78.5% (106)

Poor

3.7% (5)

Logan County's Poor-condition bridges carry 8,678 vehicle crossings a day

That is 4.5% of the county's reported daily bridge traffic on 3.7% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 1,736 crossings a day against 1,785 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 135 of 135 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

32.6% of Logan County's bridges have passed the 50-year mark

44 of the 135 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 17.8% 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 91.9% of the county's Poor-condition bridge traffic

US-68X over RJC RAILROAD, built 1936, carries 7,976 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 5-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 8,678 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

4
1930s

24
1940s

2
1950s

1
1960s

3
1970s

22
1980s

16
1990s

38
2000s

13
2010s

10
2020s

2

What this shows Construction peaked in the 1990s, when 38 of the county's bridges still in the inventory were built, which is 28.1% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year (1978) matches the Kentucky average (1978).

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

The 5 Kentucky counties nearest Logan County in number of bridges, with their condition splits. Its 3.7% Poor share is the 2nd-lowest of these 6. Its average build year of 1978 against a peer-group mean of 1979 is in line with the group.

Showing the 5 closest of 119 Kentucky counties eligible for comparison.

Bridge inventory size and condition shares for Logan County and the 5 Kentucky counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Boone County	138	40.6%	55.1%	4.3%	1981
Shelby County	137	10.2%	81.8%	8%	1982
Lincoln County	136	13.2%	83.8%	2.9%	1976
Logan County (this page)	135	17.8%	78.5%	3.7%	1978
Knott County	134	35.8%	51.5%	12.7%	1981
Laurel County	131	22.1%	73.3%	4.6%	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 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 Kentucky so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside KY (135 bridges here).

Nevada County, CA · 135 bridges
Meriwether County, GA · 135 bridges
Steuben County, IN · 135 bridges
Warren County, IN · 135 bridges

Similar average build year

Nearest mean year-built outside KY (1978 here).

Orange County, CA · avg 1978 · 1,164 bridges
Sumner County, KS · avg 1978 · 659 bridges
Allen County, IN · avg 1978 · 613 bridges
Livingston County, IL · avg 1978 · 579 bridges

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

All 135 Good 24 Fair 106 Poor 5

Fair-condition bridges (106)

Sort:

Logan County Bridge Snapshot

Condition distribution

Logan County's Poor-condition bridges carry 8,678 vehicle crossings a day

32.6% of Logan County's bridges have passed the 50-year mark

One structure carries 91.9% of the county's Poor-condition bridge traffic

How Logan County compares with Kentucky'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 (106)

LOGAN MILL RD

NORTH BREATHITT ST

NORTH SPRING ST

STEVENSON MILL RD

KY-178

US 431

KY-739

KY-1309

KY-73

CEDAR GROVE RD

DAVID FARMER RD

KY-96

JOHNSON WHITE RD

KY-775

KY-106

KY-79

DOT RD

KY-1308

IRON MOUNTAIN RD

KY-1466

KY-1151

US-431

STEVENSON MILL RD

UNION GROVE RD

THREE POPLARS RD

KY-73

US-431

SMITH GROVE RD

US-431

KY-100

TURNER RD

KINGSFORD RD

US-431

CORNELIUS STREET

KY-106

E 3RD ST

CONCORD RD

KY-1151

HOMER RD

RIVER RD

EAST 7TH ST

E 6TH ST

BARREN PLAINS RD

KY-107

KY-103

US-431

J WILL STEWART RD

TAYLOR BARROW RD

KY 3240

US-431

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