I-73 US421N over SR1129
GoodGuilford County, North Carolina · 0.6 Mi. S. Jct. SR4121 · Structure no. 000000000810870
- Built
- 2008
- 17 years old
- Condition
- Good
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 136 ft
- 1 main span
- Daily traffic
- 27,250
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
I-73 US421N over SR1129 is a steel stringer/multi-beam or girder carrying I-73 US421N over SR1129 in Guilford County, North Carolina. It was built in 2008, so it is 17 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 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 27,250 vehicles a day, roughly 16% of them trucks, projected to reach 54,500 by 2040. The structure is 136 ft (41.4 m) long and 72 ft wide. 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 |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-73 US421N over SR1129 built?
It was built in 2008, making it 17 years old in 2025.
What condition is I-73 US421N over SR1129 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 April 2024.
How much traffic does I-73 US421N over SR1129 carry?
About 27,250 vehicles per day (2020 count), of which roughly 16% are trucks.
How long is I-73 US421N over SR1129?
The structure is 136 ft (41.4 m) long with a longest span of 132 ft (40.2 m) and a deck 72 ft wide.
Who owns I-73 US421N over SR1129?
It is owned by the State Highway Agency.