State Route 580 over Bellam Boulevard
FairMarin County, California · 04-MRN-580-4.50-SRF · Structure no. 27 0073L
- Built
- 1959
- 66 years old
- Condition
- Fair
- inspected May 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 122 ft
- 2 main spans
- Daily traffic
- 67,000
- 2021 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 580 over Bellam Boulevard is a concrete continuous box beam or girders - multiple carrying State Route 580 over Bellam Boulevard in Marin County, California. It was built in 1959, so it is 66 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 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 67,000 vehicles a day, roughly 7% of them trucks, projected to reach 85,000 by 2045. The structure is 122 ft (37.2 m) long and 41 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 | 7 Good | Some minor problems. |
| 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 State Route 580 over Bellam Boulevard built?
It was built in 1959, making it 66 years old in 2025.
What condition is State Route 580 over Bellam Boulevard 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 2024.
How much traffic does State Route 580 over Bellam Boulevard carry?
About 67,000 vehicles per day (2021 count), of which roughly 7% are trucks.
How long is State Route 580 over Bellam Boulevard?
The structure is 122 ft (37.2 m) long with a longest span of 61 ft (18.5 m) and a deck 41 ft wide.
Who owns State Route 580 over Bellam Boulevard?
It is owned by the State Highway Agency.