S-18-83 over Polk Swamp
GoodDorchester County, South Carolina · 3.1 MI SE ST George · Structure no. 000000000004519
- Built
- 1965
- 60 years old
- Condition
- Good
- inspected April 2023
- Type
- Slab
- Concrete
- Length
- 30 ft
- 2 main spans
- Daily traffic
- 550
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S-18-83 over Polk Swamp is a concrete slab carrying S-18-83 over Polk Swamp in Dorchester County, South Carolina. It was built in 1965, so it is 60 years old, older 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 550 vehicles a day, roughly 10% of them trucks, projected to reach 803 by 2043. The structure is 30 ft (9.1 m) long and 28 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S-18-83 over Polk Swamp built?
It was built in 1965, making it 60 years old in 2025.
What condition is S-18-83 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 April 2023.
How much traffic does S-18-83 over Polk Swamp carry?
About 550 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is S-18-83 over Polk Swamp?
The structure is 30 ft (9.1 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.
Who owns S-18-83 over Polk Swamp?
It is owned by the State Highway Agency.