S-3-21 over Coosawhatchie River
GoodAllendale County, South Carolina · 5MI SW Allendale · Structure no. 000000000007315
- Built
- 2016
- 9 years old
- Condition
- Good
- inspected May 2023
- Type
- Slab
- Concrete
- Length
- 170 ft
- 3 main spans
- Daily traffic
- 275
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S-3-21 over Coosawhatchie River is a concrete slab carrying S-3-21 over Coosawhatchie River in Allendale County, South Carolina. It was built in 2016, so it is 9 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 275 vehicles a day, roughly 5% of them trucks, projected to reach 352 by 2043. The structure is 170 ft (51.8 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S-3-21 over Coosawhatchie River built?
It was built in 2016, making it 9 years old in 2025.
What condition is S-3-21 over Coosawhatchie River 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 May 2023.
How much traffic does S-3-21 over Coosawhatchie River carry?
About 275 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is S-3-21 over Coosawhatchie River?
The structure is 170 ft (51.8 m) long with a longest span of 70 ft (21.3 m) and a deck 36 ft wide.
Who owns S-3-21 over Coosawhatchie River?
It is owned by the State Highway Agency.