S-18-56 over Four Hole Swamp
FairClosed to trafficDorchester County, South Carolina · Four Hole Swamp #2 · Structure no. 000000000005036
- Built
- 1967
- 58 years old
- Condition
- Fair
- inspected April 2024
- Type
- Slab
- Concrete
- Length
- 375 ft
- 25 main spans
- Daily traffic
- 425
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
S-18-56 over Four Hole Swamp is a concrete slab carrying S-18-56 over Four Hole Swamp in Dorchester County, South Carolina. It was built in 1967, so it is 58 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. Its operating status is: closed to all traffic.
It carries about 425 vehicles a day, roughly 9% of them trucks, projected to reach 621 by 2044. The structure is 375 ft (114.3 m) long and 28 ft wide. If it were closed, the detour would be 8.7 mi (14 km).
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 | 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S-18-56 over Four Hole Swamp built?
It was built in 1967, making it 58 years old in 2025.
What condition is S-18-56 over Four Hole Swamp 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 April 2024.
How much traffic does S-18-56 over Four Hole Swamp carry?
About 425 vehicles per day (2024 count), of which roughly 9% are trucks.
How long is S-18-56 over Four Hole Swamp?
The structure is 375 ft (114.3 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.
Who owns S-18-56 over Four Hole Swamp?
It is owned by the State Highway Agency.