Interstate 280 SB over San Francisquito Creek
PoorSan Mateo County, California · 04-SM-280-R0.30 · Structure no. 35 0234L
- Built
- 1969
- 56 years old
- Condition
- Poor
- inspected October 2023
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 245 ft
- 3 main spans
- Daily traffic
- 46,500
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 280 SB over San Francisquito Creek is a concrete continuous box beam or girders - multiple carrying Interstate 280 SB over San Francisquito Creek 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 46,500 vehicles a day, roughly 3% of them trucks, projected to reach 170,952 by 2040. The structure is 245 ft (74.7 m) long and 70 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 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 | 7 Good | Some minor problems. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Interstate 280 SB over San Francisquito Creek built?
It was built in 1969, making it 56 years old in 2025.
What condition is Interstate 280 SB over San Francisquito Creek 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 SB over San Francisquito Creek carry?
About 46,500 vehicles per day (2009 count), of which roughly 3% are trucks.
How long is Interstate 280 SB over San Francisquito Creek?
The structure is 245 ft (74.7 m) long with a longest span of 83 ft (25.3 m) and a deck 70 ft wide.
Who owns Interstate 280 SB over San Francisquito Creek?
It is owned by the State Highway Agency.