US 401 over Cowpen Swamp
FairSumter County, South Carolina · 6 MI NE of Sumter · Structure no. 000000000008105
- Built
- 1987
- 38 years old
- Condition
- Fair
- inspected May 2024
- Type
- Slab
- Concrete
- Length
- 120 ft
- 4 main spans
- Daily traffic
- 2,200
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 401 over Cowpen Swamp is a concrete slab carrying US 401 over Cowpen Swamp in Sumter County, South Carolina. It was built in 1987, so it is 38 years old, younger 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 2,200 vehicles a day, roughly 6% of them trucks, projected to reach 3,498 by 2043. The structure is 120 ft (36.6 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 401 over Cowpen Swamp built?
It was built in 1987, making it 38 years old in 2025.
What condition is US 401 over Cowpen 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 May 2024.
How much traffic does US 401 over Cowpen Swamp carry?
About 2,200 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is US 401 over Cowpen Swamp?
The structure is 120 ft (36.6 m) long with a longest span of 30 ft (9.1 m) and a deck 47 ft wide.
Who owns US 401 over Cowpen Swamp?
It is owned by the State Highway Agency.