US Bridges

I-520 over Unnamed Stream

Fair

Aiken County, South Carolina · North Augusta · Structure no. 000000000009868

Built
2008
17 years old
Condition
Fair
inspected January 2024
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
20,000
2023 count
Owner
State
State Highway Agency

About this bridge

I-520 over Unnamed Stream is a concrete culvert carrying I-520 over Unnamed Stream in Aiken County, South Carolina. It was built in 2008, so it is 17 years old, younger than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 20,000 vehicles a day, roughly 17% of them trucks, projected to reach 24,600 by 2043. The structure is 21 ft (6.4 m) long and 881 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesI-520
CrossesUnnamed Stream
LocationNorth Augusta
RouteInterstate 520
CountyAiken County
StateSouth Carolina
Coordinates33.52917, -81.92333
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 25 or greater
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width881 ft (268.5 m)
Roadway width879 ft (267.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,000 (2023)
Projected traffic24,600 by 2043
Trucks17%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-520 over Unnamed Stream built?

It was built in 2008, making it 17 years old in 2025.

What condition is I-520 over Unnamed Stream in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2024.

How much traffic does I-520 over Unnamed Stream carry?

About 20,000 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is I-520 over Unnamed Stream?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 881 ft wide.

Who owns I-520 over Unnamed Stream?

It is owned by the State Highway Agency.