Diamond Blvd over Walnut Creek
FairContra Costa County, California · 0.1 MI N Willow Pass RD · Structure no. 28C0189L
- Built
- 1966
- 59 years old
- Condition
- Fair
- inspected January 2025
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 279 ft
- 5 main spans
- Daily traffic
- 33,000
- 1977 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Diamond Blvd over Walnut Creek is a prestressed concrete stringer/multi-beam or girder carrying Diamond Blvd over Walnut Creek in Contra Costa County, California. It was built in 1966, so it is 59 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 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 33,000 vehicles a day, roughly 5% of them trucks, projected to reach 23,516 by 2047. The structure is 279 ft (85.1 m) long and 37 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 9 Excellent | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Diamond Blvd over Walnut Creek built?
It was built in 1966, making it 59 years old in 2025.
What condition is Diamond Blvd over Walnut Creek 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 January 2025.
How much traffic does Diamond Blvd over Walnut Creek carry?
About 33,000 vehicles per day (1977 count), of which roughly 5% are trucks.
How long is Diamond Blvd over Walnut Creek?
The structure is 279 ft (85.1 m) long with a longest span of 55 ft (16.9 m) and a deck 37 ft wide.
Who owns Diamond Blvd over Walnut Creek?
It is owned by the City or Municipal Highway Agency.