S-18-16 over Polk Swamp
GoodDorchester County, South Carolina · 4.6MI NW of ST George · Structure no. 000000000002331
- Built
- 2004
- 21 years old
- Condition
- Good
- inspected May 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 70 ft
- 2 main spans
- Daily traffic
- 500
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S-18-16 over Polk Swamp is a prestressed concrete box beam or girders - multiple carrying S-18-16 over Polk Swamp in Dorchester County, South Carolina. It was built in 2004, so it is 21 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 500 vehicles a day, roughly 5% of them trucks, projected to reach 730 by 2043. The structure is 70 ft (21.3 m) long and 36 ft wide. If it were closed, the detour would be 6.2 mi (10 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S-18-16 over Polk Swamp built?
It was built in 2004, making it 21 years old in 2025.
What condition is S-18-16 over Polk 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 2023.
How much traffic does S-18-16 over Polk Swamp carry?
About 500 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is S-18-16 over Polk Swamp?
The structure is 70 ft (21.3 m) long with a longest span of 40 ft (12.2 m) and a deck 36 ft wide.
Who owns S-18-16 over Polk Swamp?
It is owned by the State Highway Agency.