US Bridges

Sc 12 over US 378

Fair

Lexington County, South Carolina · 1 MI W of Columbia · Structure no. 000000000006897

Built
1976
49 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
269 ft
4 main spans
Daily traffic
24,500
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 12 over US 378 is a steel stringer/multi-beam or girder carrying Sc 12 over US 378 in Lexington County, South Carolina. It was built in 1976, so it is 49 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 24,500 vehicles a day, roughly 4% of them trucks, projected to reach 57,575 by 2043. The structure is 269 ft (82 m) long and 85 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSc 12
CrossesUS 378
Location1 MI W of Columbia
RouteState Highway 12
CountyLexington County
StateSouth Carolina
Coordinates33.99639, -81.05944
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.2 US tons
Inventory rating41.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length269 ft (82 m)
Longest span96 ft (29.3 m)
Deck width85 ft (26 m)
Roadway width82 ft (25 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,500 (2023)
Projected traffic57,575 by 2043
Trucks4%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.9 mi (3 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 Sc 12 over US 378 built?

It was built in 1976, making it 49 years old in 2025.

What condition is Sc 12 over US 378 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 November 2023.

How much traffic does Sc 12 over US 378 carry?

About 24,500 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Sc 12 over US 378?

The structure is 269 ft (82 m) long with a longest span of 96 ft (29.3 m) and a deck 85 ft wide.

Who owns Sc 12 over US 378?

It is owned by the State Highway Agency.