Interstate 580 over San Quentin Street
GoodMarin County, California · 04-MRN-580-2.63-SRF · Structure no. 27 0070
- Built
- 1957
- 68 years old
- Condition
- Good
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 85 ft
- 3 main spans
- Daily traffic
- 67,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 580 over San Quentin Street is a steel continuous stringer/multi-beam or girder carrying Interstate 580 over San Quentin Street in Marin County, California. It was built in 1957, so it is 68 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 67,000 vehicles a day, roughly 7% of them trucks, projected to reach 119,625 by 2042. The structure is 85 ft (25.9 m) long and 97 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| 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 Interstate 580 over San Quentin Street built?
It was built in 1957, making it 68 years old in 2025.
What condition is Interstate 580 over San Quentin Street in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.
How much traffic does Interstate 580 over San Quentin Street carry?
About 67,000 vehicles per day (2009 count), of which roughly 7% are trucks.
How long is Interstate 580 over San Quentin Street?
The structure is 85 ft (25.9 m) long with a longest span of 60 ft (18.3 m) and a deck 97 ft wide.
Who owns Interstate 580 over San Quentin Street?
It is owned by the State Highway Agency.