ST Marys Road over Las Trampas Creek
GoodContra Costa County, California · 1.1 MI N Rheem Blvd · Structure no. 28C0138
- Built
- 1975
- 50 years old
- Condition
- Good
- inspected December 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 90 ft
- 1 main span
- Daily traffic
- 10,570
- 2016 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
ST Marys Road over Las Trampas Creek is a prestressed concrete box beam or girders - multiple carrying ST Marys Road over Las Trampas Creek in Contra Costa County, California. It was built in 1975, so it is 50 years old, younger than the California average of 54.8 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 10,570 vehicles a day, roughly 4% of them trucks, projected to reach 12,114 by 2042. The structure is 90 ft (27.4 m) long and 46 ft wide. If it were closed, the detour would be 8.1 mi (13 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. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was ST Marys Road over Las Trampas Creek built?
It was built in 1975, making it 50 years old in 2025.
What condition is ST Marys Road over Las Trampas Creek 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 ST Marys Road over Las Trampas Creek carry?
About 10,570 vehicles per day (2016 count), of which roughly 4% are trucks.
How long is ST Marys Road over Las Trampas Creek?
The structure is 90 ft (27.4 m) long with a longest span of 88 ft (26.8 m) and a deck 46 ft wide.
Who owns ST Marys Road over Las Trampas Creek?
It is owned by the City or Municipal Highway Agency.