Washington Street over Interstate 280
FairSan Mateo County, California · 04-SM-280-R25.97-DLC · Structure no. 35 0185
- Built
- 1965
- 60 years old
- Condition
- Fair
- inspected February 2025
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 259 ft
- 3 main spans
- Daily traffic
- 4,080
- 2002 count
- Owner
- State
- State Highway Agency
About this bridge
Washington Street over Interstate 280 is a concrete continuous box beam or girders - multiple carrying Washington Street over Interstate 280 in San Mateo County, California. It was built in 1965, so it is 60 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 4,080 vehicles a day, roughly 2% of them trucks, projected to reach 5,598 by 2047. The structure is 259 ft (78.8 m) long and 61 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 | 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 Washington Street over Interstate 280 built?
It was built in 1965, making it 60 years old in 2025.
What condition is Washington Street over Interstate 280 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 2025.
How much traffic does Washington Street over Interstate 280 carry?
About 4,080 vehicles per day (2002 count), of which roughly 2% are trucks.
How long is Washington Street over Interstate 280?
The structure is 259 ft (78.8 m) long with a longest span of 103 ft (31.3 m) and a deck 61 ft wide.
Who owns Washington Street over Interstate 280?
It is owned by the State Highway Agency.