Interstate 680 over Diablo Road
FairContra Costa County, California · 04-CC-680-R7.55-DNVL · Structure no. 28 0198
- Built
- 1964
- 61 years old, rebuilt 1994
- Condition
- Fair
- inspected July 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 147 ft
- 3 main spans
- Daily traffic
- 192,200
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 680 over Diablo Road is a concrete continuous box beam or girders - multiple carrying Interstate 680 over Diablo Road in Contra Costa County, California. It was built in 1964 and reconstructed in 1994, so it is 61 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 192,200 vehicles a day, roughly 6% of them trucks, projected to reach 250,000 by 2041. The structure is 147 ft (44.8 m) long and 149 ft wide. If it were closed, the detour would be 3.1 mi (5 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Interstate 680 over Diablo Road built?
It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1994.
What condition is Interstate 680 over Diablo Road in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2024.
How much traffic does Interstate 680 over Diablo Road carry?
About 192,200 vehicles per day (2020 count), of which roughly 6% are trucks.
How long is Interstate 680 over Diablo Road?
The structure is 147 ft (44.8 m) long with a longest span of 87 ft (26.5 m) and a deck 149 ft wide.
Who owns Interstate 680 over Diablo Road?
It is owned by the State Highway Agency.