S-21-86 over Br of Big Swamp
FairFlorence County, South Carolina · 3 MI S Pamplico · Structure no. 000000000005524
- Built
- 1969
- 56 years old, rebuilt 2009
- Condition
- Fair
- inspected March 2023
- Type
- Slab
- Concrete
- Length
- 45 ft
- 3 main spans
- Daily traffic
- 1,500
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S-21-86 over Br of Big Swamp is a concrete slab carrying S-21-86 over Br of Big Swamp in Florence County, South Carolina. It was built in 1969 and reconstructed in 2009, so it is 56 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 1,500 vehicles a day, roughly 8% of them trucks, projected to reach 2,085 by 2043. The structure is 45 ft (13.7 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 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-21-86 over Br of Big Swamp built?
It was built in 1969, making it 56 years old in 2025. It was reconstructed in 2009.
What condition is S-21-86 over Br of Big 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 March 2023.
How much traffic does S-21-86 over Br of Big Swamp carry?
About 1,500 vehicles per day (2023 count), of which roughly 8% are trucks.
How long is S-21-86 over Br of Big 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-21-86 over Br of Big Swamp?
It is owned by the State Highway Agency.