I-20 over Mill Branch
FairLee County, South Carolina · 6MI SE of Bishopville · Structure no. 000000000006142
- Built
- 1972
- 53 years old
- Condition
- Fair
- inspected July 2024
- Type
- Culvert
- Concrete
- Length
- 36 ft
- 4 main spans
- Daily traffic
- 29,500
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-20 over Mill Branch is a concrete culvert carrying I-20 over Mill Branch in Lee County, South Carolina. It was built in 1972, so it is 53 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 29,500 vehicles a day, roughly 16% of them trucks, projected to reach 47,200 by 2043. The structure is 36 ft (11 m) long and 150 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-20 over Mill Branch built?
It was built in 1972, making it 53 years old in 2025.
What condition is I-20 over Mill 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 July 2024.
How much traffic does I-20 over Mill Branch carry?
About 29,500 vehicles per day (2023 count), of which roughly 16% are trucks.
How long is I-20 over Mill Branch?
The structure is 36 ft (11 m) long with a longest span of 9 ft (2.7 m) and a deck 150 ft wide.
Who owns I-20 over Mill Branch?
It is owned by the State Highway Agency.