S-21-147 over Lynches River Swamp
FairFlorence County, South Carolina · 5MI SW Effingham · Structure no. 000000000001710
- Built
- 1950
- 75 years old
- Condition
- Fair
- inspected March 2023
- Type
- Culvert
- Concrete Continuous
- Length
- 21 ft
- 3 main spans
- Daily traffic
- 1,350
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S-21-147 over Lynches River Swamp is a concrete continuous culvert carrying S-21-147 over Lynches River Swamp in Florence County, South Carolina. It was built in 1950, so it is 75 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 1,350 vehicles a day, roughly 10% of them trucks, projected to reach 1,971 by 2043. The structure is 21 ft (6.4 m) long and 30 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 |
|---|---|---|
| Channel and channel protection | 8 Very Good | No problems noted. |
| Culvert | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S-21-147 over Lynches River Swamp built?
It was built in 1950, making it 75 years old in 2025.
What condition is S-21-147 over Lynches 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 March 2023.
How much traffic does S-21-147 over Lynches River Swamp carry?
About 1,350 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is S-21-147 over Lynches River Swamp?
The structure is 21 ft (6.4 m) long with a longest span of 6 ft (1.8 m) and a deck 30 ft wide.
Who owns S-21-147 over Lynches River Swamp?
It is owned by the State Highway Agency.