US 278 EB over Mackay Creek
PoorBeaufort County, South Carolina · @ Hilton Head Island · Structure no. 000000000002297
- Built
- 1956
- 69 years old, rebuilt 1984
- Condition
- Poor
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 2,230 ft
- 1 main span
- Daily traffic
- 28,950
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 278 EB over Mackay Creek is a steel stringer/multi-beam or girder carrying US 278 EB over Mackay Creek in Beaufort County, South Carolina. It was built in 1956 and reconstructed in 1984, so it is 69 years old, older than the South Carolina average of 48 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 28,950 vehicles a day, roughly 4% of them trucks, projected to reach 45,162 by 2043. The structure is 2,230 ft (679.8 m) long and 39 ft wide.
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 278 EB over Mackay Creek built?
It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1984.
What condition is US 278 EB over Mackay Creek in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.
How much traffic does US 278 EB over Mackay Creek carry?
About 28,950 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is US 278 EB over Mackay Creek?
The structure is 2,230 ft (679.8 m) long with a longest span of 70 ft (21.4 m) and a deck 39 ft wide.
Who owns US 278 EB over Mackay Creek?
It is owned by the State Highway Agency.