Interstate 280 NB over Westborough Blvd
FairSan Mateo County, California · 04-SM-280-R22.62-SSF · Structure no. 35 0212R
- Built
- 1967
- 58 years old
- Condition
- Fair
- inspected February 2025
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 174 ft
- 2 main spans
- Daily traffic
- 89,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 280 NB over Westborough Blvd is a concrete continuous box beam or girders - multiple carrying Interstate 280 NB over Westborough Blvd in San Mateo County, California. It was built in 1967, so it is 58 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 89,000 vehicles a day, roughly 1% of them trucks, projected to reach 134,911 by 2047. The structure is 174 ft (53 m) long and 87 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Interstate 280 NB over Westborough Blvd built?
It was built in 1967, making it 58 years old in 2025.
What condition is Interstate 280 NB over Westborough Blvd 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 Interstate 280 NB over Westborough Blvd carry?
About 89,000 vehicles per day (2009 count), of which roughly 1% are trucks.
How long is Interstate 280 NB over Westborough Blvd?
The structure is 174 ft (53 m) long with a longest span of 99 ft (30.2 m) and a deck 87 ft wide.
Who owns Interstate 280 NB over Westborough Blvd?
It is owned by the State Highway Agency.