US Bridges

Sc 39 over I-20

Fair

Aiken County, South Carolina · 8 MI SE of Monetta · Structure no. 000000000005654

Built
1970
55 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
256 ft
4 main spans
Daily traffic
5,000
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 39 over I-20 is a steel stringer/multi-beam or girder carrying Sc 39 over I-20 in Aiken County, South Carolina. It was built in 1970, so it is 55 years old, older 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 5 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 5,000 vehicles a day, roughly 27% of them trucks, projected to reach 7,950 by 2043. The structure is 256 ft (78 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSc 39
CrossesI-20
Location8 MI SE of Monetta
RouteState Highway 39
Coordinates33.75211, -81.52753
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating49.3 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length256 ft (78 m)
Longest span88 ft (26.8 m)
Deck width48 ft (14.5 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,000 (2023)
Projected traffic7,950 by 2043
Trucks27%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 Sc 39 over I-20 built?

It was built in 1970, making it 55 years old in 2025.

What condition is Sc 39 over I-20 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 February 2024.

How much traffic does Sc 39 over I-20 carry?

About 5,000 vehicles per day (2023 count), of which roughly 27% are trucks.

How long is Sc 39 over I-20?

The structure is 256 ft (78 m) long with a longest span of 88 ft (26.8 m) and a deck 48 ft wide.

Who owns Sc 39 over I-20?

It is owned by the State Highway Agency.