SH 121 SB / Ss 399 over Medical Center DR
GoodCollin County, Texas · 0.6 MI East of US 75 · Structure no. 180430036404459
- Built
- 2011
- 14 years old
- Condition
- Good
- inspected December 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 277 ft
- 3 main spans
- Daily traffic
- 19,785
- 2020 count
- Owner
- Toll Authority
- Local Toll Authority
About this bridge
SH 121 SB / Ss 399 over Medical Center DR is a prestressed concrete stringer/multi-beam or girder carrying SH 121 SB / Ss 399 over Medical Center DR in Collin County, Texas. It was built in 2011, so it is 14 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 19,785 vehicles a day, roughly 6% of them trucks, projected to reach 27,699 by 2040. The structure is 277 ft (84.4 m) long and 60 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 SB / Ss 399 over Medical Center DR built?
It was built in 2011, making it 14 years old in 2025.
What condition is SH 121 SB / Ss 399 over Medical Center DR 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 December 2023.
How much traffic does SH 121 SB / Ss 399 over Medical Center DR carry?
About 19,785 vehicles per day (2020 count), of which roughly 6% are trucks.
How long is SH 121 SB / Ss 399 over Medical Center DR?
The structure is 277 ft (84.4 m) long with a longest span of 97 ft (29.6 m) and a deck 60 ft wide.
Who owns SH 121 SB / Ss 399 over Medical Center DR?
It is owned by the Local Toll Authority.