Sneath Lane over Interstate 280
FairSan Mateo County, California · 04-SM-280-R21.30-SBR · Structure no. 35 0225
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected July 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 361 ft
- 4 main spans
- Daily traffic
- 20,000
- 1998 count
- Owner
- State
- State Highway Agency
About this bridge
Sneath Lane over Interstate 280 is a prestressed concrete continuous box beam or girders - multiple carrying Sneath Lane over Interstate 280 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 20,000 vehicles a day, roughly 3% of them trucks, projected to reach 25,010 by 2040. The structure is 361 ft (110.1 m) long and 67 ft wide. If it were closed, the detour would be 3.7 mi (6 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 Sneath Lane over Interstate 280 built?
It was built in 1971, making it 54 years old in 2025.
What condition is Sneath Lane 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 July 2023.
How much traffic does Sneath Lane over Interstate 280 carry?
About 20,000 vehicles per day (1998 count), of which roughly 3% are trucks.
How long is Sneath Lane over Interstate 280?
The structure is 361 ft (110.1 m) long with a longest span of 105 ft (32 m) and a deck 67 ft wide.
Who owns Sneath Lane over Interstate 280?
It is owned by the State Highway Agency.