I40 US421 over E. Prong Deep River
GoodGuilford County, North Carolina · 0.4 MI.E.JCT.NC68 · Structure no. 000000000810550
- Built
- 1947
- 78 years old
- Condition
- Good
- inspected March 2024
- Type
- Culvert
- Concrete Continuous
- Length
- 31 ft
- 3 main spans
- Daily traffic
- 106,000
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
I40 US421 over E. Prong Deep River is a concrete continuous culvert carrying I40 US421 over E. Prong Deep River in Guilford County, North Carolina. It was built in 1947, so it is 78 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 106,000 vehicles a day, roughly 16% of them trucks, projected to reach 212,000 by 2040. The structure is 31 ft (9.4 m) long. If it were closed, the detour would be 0.6 mi (1 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I40 US421 over E. Prong Deep River built?
It was built in 1947, making it 78 years old in 2025.
What condition is I40 US421 over E. Prong Deep River in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2024.
How much traffic does I40 US421 over E. Prong Deep River carry?
About 106,000 vehicles per day (2020 count), of which roughly 16% are trucks.
How long is I40 US421 over E. Prong Deep River?
The structure is 31 ft (9.4 m) long with a longest span of 9 ft (2.7 m).
Who owns I40 US421 over E. Prong Deep River?
It is owned by the State Highway Agency.