S-18-26 over Polk Swamp
FairDorchester County, South Carolina · 2MI SW ST George · Structure no. 000000000001947
- Built
- 1953
- 72 years old, rebuilt 1993
- Condition
- Fair
- inspected April 2023
- Type
- Slab
- Concrete
- Length
- 140 ft
- 10 main spans
- Daily traffic
- 800
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S-18-26 over Polk Swamp is a concrete slab carrying S-18-26 over Polk Swamp in Dorchester County, South Carolina. It was built in 1953 and reconstructed in 1993, so it is 72 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.
It carries about 800 vehicles a day, roughly 7% of them trucks, projected to reach 1,168 by 2043. The structure is 140 ft (42.7 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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-18-26 over Polk Swamp built?
It was built in 1953, making it 72 years old in 2025. It was reconstructed in 1993.
What condition is S-18-26 over Polk 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 2023.
How much traffic does S-18-26 over Polk Swamp carry?
About 800 vehicles per day (2023 count), of which roughly 7% are trucks.
How long is S-18-26 over Polk Swamp?
The structure is 140 ft (42.7 m) long with a longest span of 14 ft (4.3 m) and a deck 26 ft wide.
Who owns S-18-26 over Polk Swamp?
It is owned by the State Highway Agency.