S-21-136 over Alligator Branch
FairFlorence County, South Carolina · 4MI SW Florence · Structure no. 000000000003654
- Built
- 1961
- 64 years old, rebuilt 1989
- Condition
- Fair
- inspected April 2023
- Type
- Slab
- Concrete
- Length
- 30 ft
- 2 main spans
- Daily traffic
- 2,300
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S-21-136 over Alligator Branch is a concrete slab carrying S-21-136 over Alligator Branch in Florence County, South Carolina. It was built in 1961 and reconstructed in 1989, so it is 64 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 2,300 vehicles a day, roughly 5% of them trucks. The structure is 30 ft (9.1 m) long and 28 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 |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S-21-136 over Alligator Branch built?
It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1989.
What condition is S-21-136 over Alligator Branch 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 April 2023.
How much traffic does S-21-136 over Alligator Branch carry?
About 2,300 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is S-21-136 over Alligator Branch?
The structure is 30 ft (9.1 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.
Who owns S-21-136 over Alligator Branch?
It is owned by the State Highway Agency.