US421 Sbl over I40 Bus Wbl
FairForsyth County, North Carolina · 0.6 Mi. S. Jct. SR1122 · Structure no. 000000000670249
- Built
- 1992
- 33 years old
- Condition
- Fair
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 318 ft
- 3 main spans
- Daily traffic
- 36,500
- 2015 count
- Owner
- State
- State Highway Agency
About this bridge
US421 Sbl over I40 Bus Wbl is a steel continuous stringer/multi-beam or girder carrying US421 Sbl over I40 Bus Wbl in Forsyth County, North Carolina. It was built in 1992, so it is 33 years old, younger than the North Carolina average of 38.7 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 36,500 vehicles a day, roughly 12% of them trucks, projected to reach 73,000 by 2040. The structure is 318 ft (96.9 m) long and 43 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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US421 Sbl over I40 Bus Wbl built?
It was built in 1992, making it 33 years old in 2025.
What condition is US421 Sbl over I40 Bus Wbl 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 August 2024.
How much traffic does US421 Sbl over I40 Bus Wbl carry?
About 36,500 vehicles per day (2015 count), of which roughly 12% are trucks.
How long is US421 Sbl over I40 Bus Wbl?
The structure is 318 ft (96.9 m) long with a longest span of 161 ft (49 m) and a deck 43 ft wide.
Who owns US421 Sbl over I40 Bus Wbl?
It is owned by the State Highway Agency.