County profile · official public datasets

Marshall County, TN

240 public highway bridges tracked in the FHWA National Bridge Inventory: 56.3% rated Good, 43.8% Fair, 0% Poor.

240
Public bridges: 56.3%
Good condition: 0%
Poor condition

The verdict

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

Marshall County pairs a top-1% lowest Poor-condition share among rated counties in the state with an older average build year than the state inventory.

Top 1%
lowest Poor share in state: 0%
Poor-condition share: 240
public highway bridges: 1968
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.

Marshall County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Marshall County ranks #1 of 95 Tennessee counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0%). Marshall County, Tennessee contains 240 public highway bridges. Roughly 56.3% are rated “Good,” 43.8% “Fair,” and 0% “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

240

Public highway bridges in Marshall County

Good condition

56.3%

135 of 240 rated 7-9

Fair condition

43.8%

105 of 240 rated 5-6

Poor condition

0 of 240 rated 4 or below

In-state Poor-share rank

#1 of 95

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

Condition distribution

Share of 240 NBI-tracked bridges by lowest applicable component rating.

Good

56.3% (135)

Fair

43.8% (105)

Poor

0% (0)

60.8% of Marshall County's bridges have passed the 50-year mark

146 of the 240 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 56.3% 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.

1910s

1
1920s

9
1930s

24
1940s

16
1950s

25
1960s

53
1970s

36
1980s

37
1990s

19
2000s

7
2010s

12
2020s

1

What this shows Construction peaked in the 1960s, when 53 of the county's bridges still in the inventory were built, which is 22.1% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year is 1968, 9 years older than the Tennessee average of 1977.

How Marshall County compares with Tennessee's closest counties by inventory size

The 5 Tennessee counties nearest Marshall County in number of bridges, with their condition splits. Its 0% Poor share is the 1st-lowest of these 6. Its average build year of 1968 against a peer-group mean of 1978 is 10 years older.

Showing the 5 closest of 94 Tennessee counties eligible for comparison.

Bridge inventory size and condition shares for Marshall County and the 5 Tennessee counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Humphreys County	250	24.4%	68%	7.6%	1978
Dickson County	243	58.8%	35.8%	5.3%	1975
Haywood County	241	35.3%	60.2%	4.6%	1976
Carroll County	240	37.9%	60%	2.1%	1982
Marshall County (this page)	240	56.3%	43.8%	0%	1968
Dyer County	232	29.7%	62.1%	8.2%	1979

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

Similar inventory size

Nearest county inventories outside TN (240 bridges here).

Jefferson Davis County, LA · 240 bridges
St. Louis city County, MO · 240 bridges
Sheboygan County, WI · 240 bridges
Sumter County, AL · 241 bridges

Similar average build year

Nearest mean year-built outside TN (1968 here).

Montgomery County, PA · avg 1968 · 828 bridges
San Joaquin County, CA · avg 1968 · 644 bridges
Providence County, RI · avg 1968 · 476 bridges
Imperial County, CA · avg 1968 · 444 bridges

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

All 240 Good 135 Fair 105 Poor 0

Good-condition bridges (135)

Sort:

Marshall County Bridge Snapshot

Condition distribution

60.8% of Marshall County's bridges have passed the 50-year mark

How Marshall County compares with Tennessee's closest counties by inventory size

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Good-condition bridges (135)

NFA A329

NFA A361

NFA A374 350422H

NFA A376

CSX RR 350420U

NFA 1036 (SA 5917)

NFA 1036 (SA 5917)

NFA 1039 (SA 5909)

NFA 1039 (SA 5909)

NFA 1032 (SA 5909)

FAP 106

FAP 106

I65

I65

I65

FAU 3449

FAS 272

FAS 129

FAS 129

NFA A612 (SA 5907)

FAS 272

FAU 5435

FAS 271

FAP 11

FAP 50

FAP 50

FAP 50

FAS 373

FAS 373

FAP 99 350406Y

FAP 106

FAP 106

FAS 129

FAS 129

FAS 129

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