County profile · official public datasets

Marshall County, IN

183 public highway bridges tracked in the FHWA National Bridge Inventory: 55.2% rated Good, 41.5% Fair, 3.3% Poor.

183
Public bridges: 55.2%
Good condition: 3.3%
Poor condition

The verdict

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

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

Top 33%
lowest Poor share in state: 3.3%
Poor-condition share: 183
public highway bridges: 1984
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 #30 of 92 Indiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 3.3%). Marshall County, Indiana contains 183 public highway bridges. Roughly 55.2% are rated “Good,” 41.5% “Fair,” and 3.3% “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

183

Public highway bridges in Marshall County

Good condition

55.2%

101 of 183 rated 7-9

Fair condition

41.5%

76 of 183 rated 5-6

Poor condition

3.3%

6 of 183 rated 4 or below

In-state Poor-share rank

#30 of 92

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

Condition distribution

Share of 183 NBI-tracked bridges by lowest applicable component rating.

Good

55.2% (101)

Fair

41.5% (76)

Poor

3.3% (6)

Marshall County's Poor-condition bridges carry 2,975 vehicle crossings a day

That is 0.6% of the county's reported daily bridge traffic on 3.3% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 496 crossings a day against 3,319 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 183 of 183 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

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

53 of the 183 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 55.2% 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 42% of the county's Poor-condition bridge traffic

CENTER STREET over ARMEY DITCH, built 1905, carries 1,250 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 6-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 2,975 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

1
1910s

2
1920s

7
1930s

7
1960s

22
1970s

18
1980s

51
1990s

25
2000s

16
2010s

28
2020s

6

What this shows Construction peaked in the 1980s, when 51 of the county's bridges still in the inventory were built, which is 27.9% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year is 1984, 6 years newer than the Indiana average of 1978.

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

The 5 Indiana counties nearest Marshall County in number of bridges, with their condition splits. Its 3.3% Poor share is the 3rd-lowest of these 6. Its average build year of 1984 against a peer-group mean of 1981 is in line with the group.

Showing the 5 closest of 91 Indiana counties eligible for comparison.

Bridge inventory size and condition shares for Marshall County and the 5 Indiana counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Jay County	191	45%	48.7%	6.3%	1982
Jasper County	189	34.9%	64.6%	0.5%	1982
Huntington County	187	36.9%	59.4%	3.7%	1978
Cass County	185	48.6%	49.7%	1.6%	1988
Clay County	185	33%	56.2%	10.8%	1974
Marshall County (this page)	183	55.2%	41.5%	3.3%	1984

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 Indiana so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside IN (183 bridges here).

St. Clair County, AL · 183 bridges
Richmond County, GA · 183 bridges
Appanoose County, IA · 183 bridges
Keokuk County, IA · 183 bridges

Similar average build year

Nearest mean year-built outside IN (1984 here).

Hennepin County, MN · avg 1984 · 936 bridges
Duval County, FL · avg 1984 · 831 bridges
El Paso County, CO · avg 1984 · 686 bridges
Bell County, TX · avg 1984 · 660 bridges

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

All 183 Good 101 Fair 76 Poor 6

All bridges (183)

Sort:

Marshall County Bridge Snapshot

Condition distribution

Marshall County's Poor-condition bridges carry 2,975 vehicle crossings a day

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

One structure carries 42% of the county's Poor-condition bridge traffic

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

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

All bridges (183)

US 30 WB

PLYM/GOSHEN TRAIL

US 31 NB

US 31 SB

N FIR ROAD

US 31 NB

PIERCE STREET

N ELM ROAD

US 31 NB

WEST 11TH ROAD

US 30 EB

US 30 WB

US 31 SB

CR WEST 4A

US 31 NB

US 30 EB

US 30 WB

US 31 NB

WEST 17B ROAD

SR 10

US 31 NB

US 31 SB

PLYMOUTH-GOSHEN TR

US 31 NB

US 31 SB

US 31 SB

US 31 SB

7TH ROAD

ROSE ROAD

N OAK ROAD

US 31 NB

N THORN ROAD

N SYCAMORE ROAD

FIR ROAD

US 31 SB

US 31 SB

US 30 EB

TAMARACK ROAD

US 31 SB

EAST 9B ROAD

EAST 15TH ROAD

N BEECH ROAD

EAST 7TH ROAD

N MAPLE ROAD

US 31 NB

N FIR ROAD

US 6

N SAGE ROAD

SOUTH UPAS ROAD

N QUEEN ROAD

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