SH 121 Nbml over Sister Grove Branch
GoodCollin County, Texas · 1.4 Miles SW of SH 475 · Structure no. 180430054903231
- Built
- 2020
- 5 years old
- Condition
- Good
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 220 ft
- 3 main spans
- Daily traffic
- 7,700
- 2017 count
- Owner
- State
- State Highway Agency
About this bridge
SH 121 Nbml over Sister Grove Branch is a prestressed concrete stringer/multi-beam or girder carrying SH 121 Nbml over Sister Grove Branch in Collin County, Texas. It was built in 2020, so it is 5 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 7,700 vehicles a day, roughly 10% of them trucks, projected to reach 1 by 1900. The structure is 220 ft (67.1 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 | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SH 121 Nbml over Sister Grove Branch built?
It was built in 2020, making it 5 years old in 2025.
What condition is SH 121 Nbml over Sister Grove Branch 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 September 2023.
How much traffic does SH 121 Nbml over Sister Grove Branch carry?
About 7,700 vehicles per day (2017 count), of which roughly 10% are trucks.
How long is SH 121 Nbml over Sister Grove Branch?
The structure is 220 ft (67.1 m) long with a longest span of 100 ft (30.5 m) and a deck 40 ft wide.
Who owns SH 121 Nbml over Sister Grove Branch?
It is owned by the State Highway Agency.