S-45-574 over Johnson Swamp
FairWilliamsburg County, South Carolina · 2.0 MI S Trio · Structure no. 000000000004904
- Built
- 1966
- 59 years old, rebuilt 2003
- Condition
- Fair
- inspected October 2024
- Type
- Slab
- Concrete
- Length
- 45 ft
- 3 main spans
- Daily traffic
- 250
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S-45-574 over Johnson Swamp is a concrete slab carrying S-45-574 over Johnson Swamp in Williamsburg County, South Carolina. It was built in 1966 and reconstructed in 2003, so it is 59 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 6 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 250 vehicles a day, roughly 7% of them trucks, projected to reach 320 by 2043. The structure is 45 ft (13.7 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 S-45-574 over Johnson Swamp built?
It was built in 1966, making it 59 years old in 2025. It was reconstructed in 2003.
What condition is S-45-574 over Johnson 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 October 2024.
How much traffic does S-45-574 over Johnson Swamp carry?
About 250 vehicles per day (2023 count), of which roughly 7% are trucks.
How long is S-45-574 over Johnson Swamp?
The structure is 45 ft (13.7 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.
Who owns S-45-574 over Johnson Swamp?
It is owned by the State Highway Agency.