Sand Hill Road (n) over Interstate 280
FairSan Mateo County, California · 04-SM-280-R1.61 · Structure no. 35 0008
- Built
- 1969
- 56 years old
- Condition
- Fair
- inspected October 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 539 ft
- 4 main spans
- Daily traffic
- 13,000
- 1998 count
- Owner
- State
- State Highway Agency
About this bridge
Sand Hill Road (n) over Interstate 280 is a prestressed concrete continuous box beam or girders - multiple carrying Sand Hill Road (n) over Interstate 280 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 13,000 vehicles a day, roughly 1% of them trucks, projected to reach 25,651 by 2040. The structure is 539 ft (164.3 m) long and 39 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Sand Hill Road (n) over Interstate 280 built?
It was built in 1969, making it 56 years old in 2025.
What condition is Sand Hill Road (n) 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 October 2023.
How much traffic does Sand Hill Road (n) over Interstate 280 carry?
About 13,000 vehicles per day (1998 count), of which roughly 1% are trucks.
How long is Sand Hill Road (n) over Interstate 280?
The structure is 539 ft (164.3 m) long with a longest span of 154 ft (47 m) and a deck 39 ft wide.
Who owns Sand Hill Road (n) over Interstate 280?
It is owned by the State Highway Agency.