SH 121 NB over Dart
GoodCollin County, Texas · 0.3 MI E of SH 5 Brdg · Structure no. 180430054903228
- Built
- 2018
- 7 years old
- Condition
- Good
- inspected April 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 307 ft
- 1 main span
- Daily traffic
- 18,800
- 2012 count
- Owner
- State
- State Highway Agency
About this bridge
SH 121 NB over Dart is a prestressed concrete stringer/multi-beam or girder carrying SH 121 NB over Dart in Collin County, Texas. It was built in 2018, so it is 7 years old, younger than the Texas average of 44.4 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 18,800 vehicles a day, roughly 10% of them trucks, projected to reach 1 by 1900. The structure is 307 ft (93.6 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SH 121 NB over Dart built?
It was built in 2018, making it 7 years old in 2025.
What condition is SH 121 NB over Dart 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 2023.
How much traffic does SH 121 NB over Dart carry?
About 18,800 vehicles per day (2012 count), of which roughly 10% are trucks.
How long is SH 121 NB over Dart?
The structure is 307 ft (93.6 m) long with a longest span of 127 ft (38.7 m) and a deck 40 ft wide.
Who owns SH 121 NB over Dart?
It is owned by the State Highway Agency.