Knollwood over I40 Bus
FairForsyth County, North Carolina · 0.5 Mi. N. Jct. US158 · Structure no. 000000000670248
- Built
- 1956
- 69 years old, rebuilt 1997
- Condition
- Fair
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 167 ft
- 4 main spans
- Daily traffic
- 19,000
- 2017 count
- Owner
- State
- State Highway Agency
About this bridge
Knollwood over I40 Bus is a steel stringer/multi-beam or girder carrying Knollwood over I40 Bus in Forsyth County, North Carolina. It was built in 1956 and reconstructed in 1997, so it is 69 years old, older 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 19,000 vehicles a day, roughly 7% of them trucks, projected to reach 38,000 by 2040. The structure is 167 ft (50.9 m) long and 74 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Knollwood over I40 Bus built?
It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1997.
What condition is Knollwood over I40 Bus 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 May 2024.
How much traffic does Knollwood over I40 Bus carry?
About 19,000 vehicles per day (2017 count), of which roughly 7% are trucks.
How long is Knollwood over I40 Bus?
The structure is 167 ft (50.9 m) long with a longest span of 48 ft (14.6 m) and a deck 74 ft wide.
Who owns Knollwood over I40 Bus?
It is owned by the State Highway Agency.