S-21-145 over Lake Swamp
GoodFlorence County, South Carolina · 3MI NE Timmonsville · Structure no. 000000000009005
- Built
- 1996
- 29 years old
- Condition
- Good
- inspected April 2023
- Type
- Slab
- Concrete Continuous
- Length
- 120 ft
- 4 main spans
- Daily traffic
- 700
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S-21-145 over Lake Swamp is a concrete continuous slab carrying S-21-145 over Lake Swamp in Florence County, South Carolina. It was built in 1996, so it is 29 years old, younger than the South Carolina average of 48 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 700 vehicles a day, roughly 1% of them trucks, projected to reach 420 by 2043. The structure is 120 ft (36.6 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S-21-145 over Lake Swamp built?
It was built in 1996, making it 29 years old in 2025.
What condition is S-21-145 over Lake Swamp in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.
How much traffic does S-21-145 over Lake Swamp carry?
About 700 vehicles per day (2023 count), of which roughly 1% are trucks.
How long is S-21-145 over Lake Swamp?
The structure is 120 ft (36.6 m) long with a longest span of 30 ft (9.1 m) and a deck 35 ft wide.
Who owns S-21-145 over Lake Swamp?
It is owned by the State Highway Agency.