US 78 over Four Hole Swamp
PoorDorchester County, South Carolina · 3.8 MI NW of Ridgeville · Structure no. 000000000001454
- Built
- 1948
- 77 years old
- Condition
- Poor
- inspected June 2024
- Type
- Tee Beam
- Concrete
- Length
- 374 ft
- 17 main spans
- Daily traffic
- 9,900
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 78 over Four Hole Swamp is a concrete tee beam carrying US 78 over Four Hole Swamp in Dorchester County, South Carolina. It was built in 1948, so it is 77 years old, older than the South Carolina average of 48 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 9,900 vehicles a day, roughly 20% of them trucks, projected to reach 17,226 by 2043. The structure is 374 ft (114 m) long and 33 ft wide. If it were closed, the detour would be 13 mi (21 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 78 over Four Hole Swamp built?
It was built in 1948, making it 77 years old in 2025.
What condition is US 78 over Four Hole Swamp in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2024.
How much traffic does US 78 over Four Hole Swamp carry?
About 9,900 vehicles per day (2023 count), of which roughly 20% are trucks.
How long is US 78 over Four Hole Swamp?
The structure is 374 ft (114 m) long with a longest span of 22 ft (6.7 m) and a deck 33 ft wide.
Who owns US 78 over Four Hole Swamp?
It is owned by the State Highway Agency.