US 21 NB over Whale Branch
FairBeaufort County, South Carolina · 8.7 MI NW of Beaufort · Structure no. 000000000008413
- Built
- 1991
- 34 years old
- Condition
- Fair
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 1,300 ft
- 4 main spans
- Daily traffic
- 8,900
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 21 NB over Whale Branch is a prestressed concrete continuous stringer/multi-beam or girder carrying US 21 NB over Whale Branch in Beaufort County, South Carolina. It was built in 1991, so it is 34 years old, younger 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 8,900 vehicles a day, roughly 10% of them trucks, projected to reach 21,983 by 2043. The structure is 1,300 ft (396.2 m) long and 43 ft wide.
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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 21 NB over Whale Branch built?
It was built in 1991, making it 34 years old in 2025.
What condition is US 21 NB over Whale 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 September 2024.
How much traffic does US 21 NB over Whale Branch carry?
About 8,900 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is US 21 NB over Whale Branch?
The structure is 1,300 ft (396.2 m) long with a longest span of 100 ft (30.5 m) and a deck 43 ft wide.
Who owns US 21 NB over Whale Branch?
It is owned by the State Highway Agency.