I-77 SB over S-129 & RR CSXT
GoodLexington County, South Carolina · 3 MI S of Cayce · Structure no. 000000000007914
- Built
- 1985
- 40 years old
- Condition
- Good
- inspected December 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 238 ft
- 2 main spans
- Daily traffic
- 45,550
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-77 SB over S-129 & RR CSXT is a steel continuous stringer/multi-beam or girder carrying I-77 SB over S-129 & RR CSXT in Lexington County, South Carolina. It was built in 1985, so it is 40 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 45,550 vehicles a day, roughly 9% of them trucks, projected to reach 56,482 by 2043. The structure is 238 ft (72.5 m) long and 71 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-77 SB over S-129 & RR CSXT built?
It was built in 1985, making it 40 years old in 2025.
What condition is I-77 SB over S-129 & RR CSXT 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 December 2024.
How much traffic does I-77 SB over S-129 & RR CSXT carry?
About 45,550 vehicles per day (2023 count), of which roughly 9% are trucks.
How long is I-77 SB over S-129 & RR CSXT?
The structure is 238 ft (72.5 m) long with a longest span of 72 ft (21.9 m) and a deck 71 ft wide.
Who owns I-77 SB over S-129 & RR CSXT?
It is owned by the State Highway Agency.