S-45-570 over Thorntree Swamp
GoodWilliamsburg County, South Carolina · 3.0 MI NE Lane · Structure no. 000000000006590
- Built
- 2012
- 13 years old
- Condition
- Good
- inspected August 2024
- Type
- Slab
- Prestressed Concrete
- Length
- 70 ft
- 1 main span
- Daily traffic
- 125
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S-45-570 over Thorntree Swamp is a prestressed concrete slab carrying S-45-570 over Thorntree Swamp in Williamsburg 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 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 125 vehicles a day, roughly 5% of them trucks, projected to reach 160 by 2043. The structure is 70 ft (21.3 m) long and 36 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S-45-570 over Thorntree Swamp built?
It was built in 2012, making it 13 years old in 2025.
What condition is S-45-570 over Thorntree 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 August 2024.
How much traffic does S-45-570 over Thorntree Swamp carry?
About 125 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is S-45-570 over Thorntree Swamp?
The structure is 70 ft (21.3 m) long with a longest span of 70 ft (21.3 m) and a deck 36 ft wide.
Who owns S-45-570 over Thorntree Swamp?
It is owned by the State Highway Agency.