Interstate 580 over Arroyo Las Positas
FairAlameda County, California · 04-ALA-580-13.82 · Structure no. 33 0012
- Built
- 1972
- 53 years old, rebuilt 2011
- Condition
- Fair
- inspected February 2024
- Type
- Tee Beam
- Concrete Continuous
- Length
- 174 ft
- 3 main spans
- Daily traffic
- 208,000
- 2017 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 580 over Arroyo Las Positas is a concrete continuous tee beam carrying Interstate 580 over Arroyo Las Positas in Alameda County, California. It was built in 1972 and reconstructed in 2011, so it is 53 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 208,000 vehicles a day, roughly 14% of them trucks, projected to reach 297,391 by 2042. The structure is 174 ft (53 m) long and 183 ft wide. If it were closed, the detour would be 5 mi (8 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Interstate 580 over Arroyo Las Positas built?
It was built in 1972, making it 53 years old in 2025. It was reconstructed in 2011.
What condition is Interstate 580 over Arroyo Las Positas 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 February 2024.
How much traffic does Interstate 580 over Arroyo Las Positas carry?
About 208,000 vehicles per day (2017 count), of which roughly 14% are trucks.
How long is Interstate 580 over Arroyo Las Positas?
The structure is 174 ft (53 m) long with a longest span of 70 ft (21.3 m) and a deck 183 ft wide.
Who owns Interstate 580 over Arroyo Las Positas?
It is owned by the State Highway Agency.