US 78 over Four Hole Swamp
GoodDorchester County, South Carolina · 3.7 MI NW of Ridgeville · Structure no. 000000000001455
- Built
- 2017
- 8 years old
- Condition
- Good
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 400 ft
- 5 main spans
- Daily traffic
- 9,900
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 78 over Four Hole Swamp is a prestressed concrete continuous stringer/multi-beam or girder carrying US 78 over Four Hole Swamp in Dorchester County, South Carolina. It was built in 2017, so it is 8 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 9,900 vehicles a day, roughly 17% of them trucks, projected to reach 14,157 by 2043. The structure is 400 ft (121.9 m) long and 47 ft wide. If it were closed, the detour would be 13 mi (21 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 | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 78 over Four Hole Swamp built?
It was built in 2017, making it 8 years old in 2025.
What condition is US 78 over Four Hole 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 May 2024.
How much traffic does US 78 over Four Hole Swamp carry?
About 9,900 vehicles per day (2023 count), of which roughly 17% are trucks.
How long is US 78 over Four Hole Swamp?
The structure is 400 ft (121.9 m) long with a longest span of 80 ft (24.4 m) and a deck 47 ft wide.
Who owns US 78 over Four Hole Swamp?
It is owned by the State Highway Agency.