State Route 4 WB over Willow Pass Road
FairContra Costa County, California · 04-CC-004-R16.83 · Structure no. 28 0246L
- Built
- 1975
- 50 years old
- Condition
- Fair
- inspected May 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 173 ft
- 1 main span
- Daily traffic
- 73,000
- 2017 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 4 WB over Willow Pass Road is a prestressed concrete box beam or girders - multiple carrying State Route 4 WB over Willow Pass Road in Contra Costa County, California. It was built in 1975, so it is 50 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 73,000 vehicles a day, roughly 7% of them trucks, projected to reach 97,882 by 2045. The structure is 173 ft (52.6 m) long and 66 ft wide.
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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 4 WB over Willow Pass Road built?
It was built in 1975, making it 50 years old in 2025.
What condition is State Route 4 WB over Willow Pass 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 May 2023.
How much traffic does State Route 4 WB over Willow Pass Road carry?
About 73,000 vehicles per day (2017 count), of which roughly 7% are trucks.
How long is State Route 4 WB over Willow Pass Road?
The structure is 173 ft (52.6 m) long with a longest span of 172 ft (52.5 m) and a deck 66 ft wide.
Who owns State Route 4 WB over Willow Pass Road?
It is owned by the State Highway Agency.