Interstate 280 NB over Farm Hill Boulevard
PoorSan Mateo County, California · 04-SM-280-R4.65-WDS · Structure no. 35 0230R
- Built
- 1969
- 56 years old
- Condition
- Poor
- inspected October 2023
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 261 ft
- 2 main spans
- Daily traffic
- 44,500
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 280 NB over Farm Hill Boulevard is a concrete continuous box beam or girders - multiple carrying Interstate 280 NB over Farm Hill Boulevard 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 44,500 vehicles a day, roughly 3% of them trucks, projected to reach 76,002 by 2040. The structure is 261 ft (79.5 m) long and 70 ft wide.
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, 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 NB over Farm Hill Boulevard built?
It was built in 1969, making it 56 years old in 2025.
What condition is Interstate 280 NB over Farm Hill Boulevard in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2023.
How much traffic does Interstate 280 NB over Farm Hill Boulevard carry?
About 44,500 vehicles per day (2009 count), of which roughly 3% are trucks.
How long is Interstate 280 NB over Farm Hill Boulevard?
The structure is 261 ft (79.5 m) long with a longest span of 135 ft (41.3 m) and a deck 70 ft wide.
Who owns Interstate 280 NB over Farm Hill Boulevard?
It is owned by the State Highway Agency.