County profile · official public datasets

Marion County, FL

78 public highway bridges tracked in the FHWA National Bridge Inventory: 52.6% rated Good, 44.9% Fair, 2.6% Poor.

78
Public bridges: 52.6%
Good condition: 2.6%
Poor condition

The verdict

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

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

35th
of 67 on Poor share: 2.6%
Poor-condition share: 78
public highway bridges: 1979
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.

Marion County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Marion County ranks #35 of 67 Florida counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.6%). Marion County, Florida contains 78 public highway bridges. Roughly 52.6% are rated “Good,” 44.9% “Fair,” and 2.6% “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

Public highway bridges in Marion County

Good condition

52.6%

41 of 78 rated 7-9

Fair condition

44.9%

35 of 78 rated 5-6

Poor condition

2.6%

2 of 78 rated 4 or below

In-state Poor-share rank

#35 of 67

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

Condition distribution

Share of 78 NBI-tracked bridges by lowest applicable component rating.

Good

52.6% (41)

Fair

44.9% (35)

Poor

2.6% (2)

Marion County's Poor-condition bridges carry 4,130 vehicle crossings a day

That is 0.3% of the county's reported daily bridge traffic on 2.6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 2,065 crossings a day against 10,779 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 78 of 78 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

51.3% of Marion County's bridges have passed the 50-year mark

40 of the 78 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 52.6% 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 84.7% of the county's Poor-condition bridge traffic

CR-315 over Daisy Creek, built 1958, carries 3,500 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 2-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 4,130 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

2
1940s

4
1950s

6
1960s

26
1970s

6
1980s

6
1990s

6
2000s

7
2010s

13
2020s

2

What this shows Construction peaked in the 1960s, when 26 of the county's bridges still in the inventory were built, which is 33.3% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1979) matches the Florida average (1983).

How Marion County compares with Florida's closest counties by inventory size

The 5 Florida counties nearest Marion County in number of bridges, with their condition splits. Its 2.6% Poor share is the 1st-lowest of these 6. Its average build year of 1979 against a peer-group mean of 1977 is in line with the group.

Showing the 5 closest of 66 Florida counties eligible for comparison.

Bridge inventory size and condition shares for Marion County and the 5 Florida counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Hardee County	85	43.5%	52.9%	3.5%	1983
Marion County (this page)	78	52.6%	44.9%	2.6%	1979
Liberty County	77	19.5%	66.2%	14.3%	1974
Bradford County	75	46.7%	48%	5.3%	1976
Levy County	73	39.7%	57.5%	2.7%	1973
Putnam County	73	45.2%	52.1%	2.7%	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 Marion 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 Marion County, both outside Florida so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside FL (78 bridges here).

Winston County, AL · 78 bridges
Bryan County, GA · 78 bridges
Macon County, GA · 78 bridges
Emmet County, IA · 78 bridges

Similar average build year

Nearest mean year-built outside FL (1979 here).

Pima County, AZ · avg 1979 · 1,150 bridges
Jefferson County, KY · avg 1979 · 662 bridges
Spartanburg County, SC · avg 1979 · 638 bridges
McPherson County, KS · avg 1979 · 586 bridges

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

All 78 Good 41 Fair 35 Poor 2

Fair-condition bridges (35)

Sort:

Marion County Bridge Snapshot

Condition distribution

Marion County's Poor-condition bridges carry 4,130 vehicle crossings a day

51.3% of Marion County's bridges have passed the 50-year mark

One structure carries 84.7% of the county's Poor-condition bridge traffic

How Marion County compares with Florida'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 (35)

SE 137th Ave Road

CR-315

CR-484

CR-316

I-75

I-75

SR-40

I-75

SR-40

SR-492 EB

CR-316

I-75

I-75

I-75

I-75

SR-200 EB

I-75

I-75

I-75

SW 66th St

CR-464

I-75

SR-200 WB

I-75

CR-320

I-75 NB

SR-40

Martin Road

SR-326

NW 120th Street

I-75

SR-19

US27/301/441

NE148th Terrace Rd

CR-314

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