US 378 over Maple Swamp
GoodMarion County, South Carolina · 5 MI SE of Gresham · Structure no. 000000000001830
- Built
- 2012
- 13 years old
- Condition
- Good
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 440 ft
- 8 main spans
- Daily traffic
- 6,100
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 378 over Maple Swamp is a prestressed concrete continuous stringer/multi-beam or girder carrying US 378 over Maple Swamp in Marion County, South Carolina. It was built in 2012, so it is 13 years old, younger than the South Carolina average of 48 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 6,100 vehicles a day, roughly 19% of them trucks, projected to reach 10,614 by 2043. The structure is 440 ft (134 m) long and 47 ft wide. If it were closed, the detour would be 1.9 mi (3 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 378 over Maple Swamp built?
It was built in 2012, making it 13 years old in 2025.
What condition is US 378 over Maple Swamp in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2024.
How much traffic does US 378 over Maple Swamp carry?
About 6,100 vehicles per day (2023 count), of which roughly 19% are trucks.
How long is US 378 over Maple Swamp?
The structure is 440 ft (134 m) long with a longest span of 55 ft (16.8 m) and a deck 47 ft wide.
Who owns US 378 over Maple Swamp?
It is owned by the State Highway Agency.