Mt. Diablo Blvd over Las Trampas Creek
GoodContra Costa County, California · 100 Ft E. of N. Broadway · Structure no. 28C0515
- Built
- 1971
- 54 years old
- Condition
- Good
- inspected January 2025
- Type
- Slab
- Concrete
- Length
- 39 ft
- 1 main span
- Daily traffic
- 14,294
- 2019 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Mt. Diablo Blvd over Las Trampas Creek is a concrete slab carrying Mt. Diablo Blvd over Las Trampas Creek in Contra Costa County, California. It was built in 1971, so it is 54 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 14,294 vehicles a day, projected to reach 28,660 by 2047. The structure is 39 ft (11.9 m) long. If it were closed, the detour would be 0.6 mi (1 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mt. Diablo Blvd over Las Trampas Creek built?
It was built in 1971, making it 54 years old in 2025.
What condition is Mt. Diablo Blvd 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 January 2025.
How much traffic does Mt. Diablo Blvd over Las Trampas Creek carry?
About 14,294 vehicles per day (2019 count).
How long is Mt. Diablo Blvd over Las Trampas Creek?
The structure is 39 ft (11.9 m) long with a longest span of 34 ft (10.3 m).
Who owns Mt. Diablo Blvd over Las Trampas Creek?
It is owned by the City or Municipal Highway Agency.