Interstate 280 over I 380 & S280-E380 Cnnctr
FairSan Mateo County, California · 04-SM-280-R20.97-SBR · Structure no. 35 0217
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected July 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 346 ft
- 3 main spans
- Daily traffic
- 101,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 280 over I 380 & S280-E380 Cnnctr is a prestressed concrete continuous box beam or girders - multiple carrying Interstate 280 over I 380 & S280-E380 Cnnctr in San Mateo County, California. It was built in 1971, so it is 54 years old, younger 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 101,000 vehicles a day, roughly 2% of them trucks, projected to reach 135,172 by 2040. The structure is 346 ft (105.6 m) long and 133 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 over I 380 & S280-E380 Cnnctr built?
It was built in 1971, making it 54 years old in 2025.
What condition is Interstate 280 over I 380 & S280-E380 Cnnctr 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 July 2023.
How much traffic does Interstate 280 over I 380 & S280-E380 Cnnctr carry?
About 101,000 vehicles per day (2009 count), of which roughly 2% are trucks.
How long is Interstate 280 over I 380 & S280-E380 Cnnctr?
The structure is 346 ft (105.6 m) long with a longest span of 151 ft (46 m) and a deck 133 ft wide.
Who owns Interstate 280 over I 380 & S280-E380 Cnnctr?
It is owned by the State Highway Agency.