US 378 over I-20
FairLexington County, South Carolina · 5 MI NE of Lexington · Structure no. 000000000004369
- Built
- 1964
- 61 years old, rebuilt 1989
- Condition
- Fair
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 265 ft
- 4 main spans
- Daily traffic
- 33,000
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 378 over I-20 is a prestressed concrete stringer/multi-beam or girder carrying US 378 over I-20 in Lexington County, South Carolina. It was built in 1964 and reconstructed in 1989, so it is 61 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 33,000 vehicles a day, roughly 2% of them trucks, projected to reach 51,810 by 2043. The structure is 265 ft (80.8 m) long and 90 ft wide.
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 378 over I-20 built?
It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1989.
What condition is US 378 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 November 2023.
How much traffic does US 378 over I-20 carry?
About 33,000 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is US 378 over I-20?
The structure is 265 ft (80.8 m) long with a longest span of 68 ft (20.7 m) and a deck 90 ft wide.
Who owns US 378 over I-20?
It is owned by the State Highway Agency.