State Route 580 over Stenmark DR SB On-Ramp
FairContra Costa County, California · 04-CC-580-6.01-RCH · Structure no. 28 0141R
- Built
- 1956
- 69 years old
- Condition
- Fair
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 263 ft
- 6 main spans
- Daily traffic
- 33,500
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 580 over Stenmark DR SB On-Ramp is a steel continuous stringer/multi-beam or girder carrying State Route 580 over Stenmark DR SB On-Ramp in Contra Costa County, California. It was built in 1956, so it is 69 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 33,500 vehicles a day, roughly 5% of them trucks, projected to reach 60,614 by 2046. The structure is 263 ft (80.2 m) long and 43 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 580 over Stenmark DR SB On-Ramp built?
It was built in 1956, making it 69 years old in 2025.
What condition is State Route 580 over Stenmark DR SB On-Ramp 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 State Route 580 over Stenmark DR SB On-Ramp carry?
About 33,500 vehicles per day (2009 count), of which roughly 5% are trucks.
How long is State Route 580 over Stenmark DR SB On-Ramp?
The structure is 263 ft (80.2 m) long with a longest span of 60 ft (18.3 m) and a deck 43 ft wide.
Who owns State Route 580 over Stenmark DR SB On-Ramp?
It is owned by the State Highway Agency.