Interstate 280 SB over SR 84 (woodside Exp)
FairSan Mateo County, California · 04-SM-280-R3.32-WDS · Structure no. 35 0232L
- Built
- 1969
- 56 years old
- Condition
- Fair
- inspected October 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 158 ft
- 1 main span
- Daily traffic
- 50,500
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 280 SB over SR 84 (woodside Exp) is a prestressed concrete box beam or girders - multiple carrying Interstate 280 SB over SR 84 (woodside Exp) in San Mateo County, California. It was built in 1969, so it is 56 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 5 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 50,500 vehicles a day, roughly 3% of them trucks, projected to reach 68,555 by 2040. The structure is 158 ft (48.2 m) long and 70 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Interstate 280 SB over SR 84 (woodside Exp) built?
It was built in 1969, making it 56 years old in 2025.
What condition is Interstate 280 SB over SR 84 (woodside Exp) 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 October 2023.
How much traffic does Interstate 280 SB over SR 84 (woodside Exp) carry?
About 50,500 vehicles per day (2009 count), of which roughly 3% are trucks.
How long is Interstate 280 SB over SR 84 (woodside Exp)?
The structure is 158 ft (48.2 m) long with a longest span of 155 ft (47.3 m) and a deck 70 ft wide.
Who owns Interstate 280 SB over SR 84 (woodside Exp)?
It is owned by the State Highway Agency.