US 21 over Edisto River Swamp
FairOrangeburg County, South Carolina · 8MI S of Branchville · Structure no. 000000000002403
- Built
- 1956
- 69 years old
- Condition
- Fair
- inspected December 2023
- Type
- Tee Beam
- Concrete
- Length
- 240 ft
- 8 main spans
- Daily traffic
- 1,650
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 21 over Edisto River Swamp is a concrete tee beam carrying US 21 over Edisto River Swamp in Orangeburg County, South Carolina. It was built in 1956, so it is 69 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 1,650 vehicles a day, roughly 16% of them trucks, projected to reach 2,624 by 2043. The structure is 240 ft (73.2 m) long and 31 ft wide. If it were closed, the detour would be 5 mi (8 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 21 over Edisto River Swamp built?
It was built in 1956, making it 69 years old in 2025.
What condition is US 21 over Edisto River 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 December 2023.
How much traffic does US 21 over Edisto River Swamp carry?
About 1,650 vehicles per day (2023 count), of which roughly 16% are trucks.
How long is US 21 over Edisto River Swamp?
The structure is 240 ft (73.2 m) long with a longest span of 30 ft (9.1 m) and a deck 31 ft wide.
Who owns US 21 over Edisto River Swamp?
It is owned by the State Highway Agency.