SH 121 NB over Dnt Frontage Roads
GoodCollin County, Texas · Dnt/Sh 121 Interchange · Structure no. 180430036404122
- Built
- 2009
- 16 years old
- Condition
- Good
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 514 ft
- 5 main spans
- Daily traffic
- 55,316
- 2018 count
- Owner
- Toll Authority
- Local Toll Authority
About this bridge
SH 121 NB over Dnt Frontage Roads is a prestressed concrete stringer/multi-beam or girder carrying SH 121 NB over Dnt Frontage Roads in Collin County, Texas. It was built in 2009, so it is 16 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 55,316 vehicles a day, roughly 5% of them trucks, projected to reach 77,443 by 2038. The structure is 514 ft (156.7 m) long and 70 ft wide.
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 Dnt Frontage Roads built?
It was built in 2009, making it 16 years old in 2025.
What condition is SH 121 NB over Dnt Frontage Roads 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 November 2023.
How much traffic does SH 121 NB over Dnt Frontage Roads carry?
About 55,316 vehicles per day (2018 count), of which roughly 5% are trucks.
How long is SH 121 NB over Dnt Frontage Roads?
The structure is 514 ft (156.7 m) long with a longest span of 118 ft (36 m) and a deck 70 ft wide.
Who owns SH 121 NB over Dnt Frontage Roads?
It is owned by the Local Toll Authority.