Interstate 580 WB over Hillside
FairContra Costa County, California · 04-CC-580-R5.60-RCH · Structure no. 28 0293R
- Built
- 1985
- 40 years old
- Condition
- Fair
- inspected March 2024
- Type
- Slab
- Concrete Continuous
- Length
- 260 ft
- 9 main spans
- Daily traffic
- 34,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 580 WB over Hillside is a concrete continuous slab carrying Interstate 580 WB over Hillside in Contra Costa County, California. It was built in 1985, so it is 40 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 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 34,000 vehicles a day, roughly 5% of them trucks, projected to reach 60,614 by 2046. The structure is 260 ft (79.2 m) long and 8 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Interstate 580 WB over Hillside built?
It was built in 1985, making it 40 years old in 2025.
What condition is Interstate 580 WB over Hillside 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 March 2024.
How much traffic does Interstate 580 WB over Hillside carry?
About 34,000 vehicles per day (2009 count), of which roughly 5% are trucks.
How long is Interstate 580 WB over Hillside?
The structure is 260 ft (79.2 m) long with a longest span of 30 ft (9.2 m) and a deck 8 ft wide.
Who owns Interstate 580 WB over Hillside?
It is owned by the State Highway Agency.