Interstate 680 NB over Mt Diablo Boulevard
FairContra Costa County, California · 04-CC-680-14.22-WLC · Structure no. 28 0128R
- Built
- 1998
- 27 years old
- Condition
- Fair
- inspected July 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 203 ft
- 2 main spans
- Daily traffic
- 87,700
- 2017 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 680 NB over Mt Diablo Boulevard is a prestressed concrete continuous box beam or girders - multiple carrying Interstate 680 NB over Mt Diablo Boulevard in Contra Costa County, California. It was built in 1998, so it is 27 years old, younger 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 5 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 87,700 vehicles a day, roughly 6% of them trucks, projected to reach 116,299 by 2044. The structure is 203 ft (61.8 m) long and 72 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Interstate 680 NB over Mt Diablo Boulevard built?
It was built in 1998, making it 27 years old in 2025.
What condition is Interstate 680 NB over Mt Diablo Boulevard 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 NB over Mt Diablo Boulevard carry?
About 87,700 vehicles per day (2017 count), of which roughly 6% are trucks.
How long is Interstate 680 NB over Mt Diablo Boulevard?
The structure is 203 ft (61.8 m) long with a longest span of 104 ft (31.7 m) and a deck 72 ft wide.
Who owns Interstate 680 NB over Mt Diablo Boulevard?
It is owned by the State Highway Agency.