Mt. Diablo Blvd over San Ramon Creek Bypass
GoodContra Costa County, California · 0.25 MI E. of S. Broadway · Structure no. 28C0524
- Built
- 1986
- 39 years old
- Condition
- Good
- inspected January 2023
- Type
- Slab
- Prestressed Concrete
- Length
- 36 ft
- 1 main span
- Daily traffic
- 15,300
- 2017 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Mt. Diablo Blvd over San Ramon Creek Bypass is a prestressed concrete slab carrying Mt. Diablo Blvd over San Ramon Creek Bypass in Contra Costa County, California. It was built in 1986, so it is 39 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 15,300 vehicles a day, roughly 1% of them trucks, projected to reach 20,000 by 2040. The structure is 36 ft (11 m) long and 77 ft wide. 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 San Ramon Creek Bypass built?
It was built in 1986, making it 39 years old in 2025.
What condition is Mt. Diablo Blvd over San Ramon Creek Bypass 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 2023.
How much traffic does Mt. Diablo Blvd over San Ramon Creek Bypass carry?
About 15,300 vehicles per day (2017 count), of which roughly 1% are trucks.
How long is Mt. Diablo Blvd over San Ramon Creek Bypass?
The structure is 36 ft (11 m) long with a longest span of 34 ft (10.4 m) and a deck 77 ft wide.
Who owns Mt. Diablo Blvd over San Ramon Creek Bypass?
It is owned by the City or Municipal Highway Agency.