Concord Blvd over Mount Diablo Creek
GoodContra Costa County, California · 0.3 MI E of Bailey RD · Structure no. 28C0361
- Built
- 1957
- 68 years old, rebuilt 1991
- Condition
- Good
- inspected November 2023
- Type
- Slab
- Concrete
- Length
- 75 ft
- 2 main spans
- Daily traffic
- 9,381
- 1977 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Concord Blvd over Mount Diablo Creek is a concrete slab carrying Concord Blvd over Mount Diablo Creek in Contra Costa County, California. It was built in 1957 and reconstructed in 1991, so it is 68 years old, older 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 9,381 vehicles a day, roughly 5% of them trucks, projected to reach 26,280 by 2040. The structure is 75 ft (23 m) long and 74 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Concord Blvd over Mount Diablo Creek built?
It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1991.
What condition is Concord Blvd over Mount Diablo 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 November 2023.
How much traffic does Concord Blvd over Mount Diablo Creek carry?
About 9,381 vehicles per day (1977 count), of which roughly 5% are trucks.
How long is Concord Blvd over Mount Diablo Creek?
The structure is 75 ft (23 m) long with a longest span of 37 ft (11.2 m) and a deck 74 ft wide.
Who owns Concord Blvd over Mount Diablo Creek?
It is owned by the City or Municipal Highway Agency.