County profile · official public datasets

Greenville County, SC

635 public highway bridges tracked in the FHWA National Bridge Inventory: 56.7% rated Good, 35.4% Fair, 7.9% Poor.

635
Public bridges: 56.7%
Good condition: 7.9%
Poor condition

The verdict

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

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

34th
of 46 on Poor share: 7.9%
Poor-condition share: 635
public highway bridges: 1981
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.

Greenville County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Greenville County ranks #34 of 46 South Carolina counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 7.9%). Greenville County, South Carolina contains 635 public highway bridges. Roughly 56.7% are rated “Good,” 35.4% “Fair,” and 7.9% “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

635

Public highway bridges in Greenville County

Good condition

56.7%

360 of 635 rated 7-9

Fair condition

35.4%

225 of 635 rated 5-6

Poor condition

7.9%

50 of 635 rated 4 or below

In-state Poor-share rank

#34 of 46

Among South Carolina counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 635 NBI-tracked bridges by lowest applicable component rating.

Good

56.7% (360)

Fair

35.4% (225)

Poor

7.9% (50)

Greenville County's Poor-condition bridges carry 505,925 vehicle crossings a day

That is 8.5% of the county's reported daily bridge traffic on 7.9% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 10,119 crossings a day against 7,422 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 635 of 635 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

41.4% of Greenville County's bridges have passed the 50-year mark

263 of the 635 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 56.7% 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 24.5% of the county's Poor-condition bridge traffic

I-85 over TRIB LAUREL CRK, built 1960, carries 124,000 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 50-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 505,925 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1910s

5
1920s

12
1930s

26
1940s

27
1950s

61
1960s

98
1970s

63
1980s

62
1990s

87
2000s

100
2010s

75
2020s

19

What this shows Construction peaked in the 2000s, when 100 of the county's bridges still in the inventory were built, which is 15.7% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year (1981) matches the South Carolina average (1977).

How Greenville County compares with South Carolina's closest counties by inventory size

The 5 South Carolina counties nearest Greenville County in number of bridges, with their condition splits. Its 7.9% Poor share is the 5th-lowest of these 6. Its average build year of 1981 against a peer-group mean of 1981 is in line with the group.

Showing the 5 closest of 45 South Carolina counties eligible for comparison.

Bridge inventory size and condition shares for Greenville County and the 5 South Carolina counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Spartanburg County	638	51.7%	38.1%	10.2%	1979
Greenville County (this page)	635	56.7%	35.4%	7.9%	1981
Horry County	479	50.1%	46.1%	3.8%	1986
Anderson County	463	29.6%	65.7%	4.8%	1971
Richland County	361	50.1%	46%	3.9%	1979
Charleston County	336	37.8%	59.8%	2.4%	1988

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 Greenville 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 Greenville County, both outside South Carolina so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside SC (635 bridges here).

Montgomery County, OH · 632 bridges
Mohave County, AZ · 641 bridges
Steuben County, NY · 627 bridges
San Joaquin County, CA · 644 bridges

Similar average build year

Nearest mean year-built outside SC (1981 here).

Franklin County, OH · avg 1981 · 922 bridges
McLean County, IL · avg 1981 · 624 bridges
Shawnee County, KS · avg 1981 · 563 bridges

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

All 635 Good 360 Fair 225 Poor 50

Fair-condition bridges (225)

Sort:

Greenville County Bridge Snapshot

Condition distribution

Greenville County's Poor-condition bridges carry 505,925 vehicle crossings a day

41.4% of Greenville County's bridges have passed the 50-year mark

One structure carries 24.5% of the county's Poor-condition bridge traffic

How Greenville County compares with South Carolina'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 (225)

S-23-83

SC 291

US 25 SB

C-23-360

SC 418

SC 14

S-23-133

S-23-107

US 29

I-85

S-23-157

US 76

S-23-94

S-23-969

S-23-969

S-23-88

SC 414

S-23-154

S-23-492

I-185

S-23-42

C-23-3388

C-23-1749

US 276

SC 296

S-23-119

S-23-67

SC 291

SC 14

SC 14

S-23-159

US 25

US 123

L-23-76

S-23-48

US 276 WB

S-23-664

US 29

I-185

S-23-1163

C-23-6412

US 25 NB

S-23-103

I-385 NBL

C-23-1983

S-23-87

I-85

S-23-183

US 29

C-23-537

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