SB State RTE 280 over Serramonte Boulevard
PoorSan Mateo County, California · 04-SM-280-R24.63-DLC · Structure no. 35 0209L
- Built
- 1967
- 58 years old
- Condition
- Poor
- inspected February 2025
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 145 ft
- 2 main spans
- Daily traffic
- 89,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
SB State RTE 280 over Serramonte Boulevard is a concrete continuous box beam or girders - multiple carrying SB State RTE 280 over Serramonte Boulevard in San Mateo County, California. It was built in 1967, so it is 58 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 89,000 vehicles a day, roughly 1% of them trucks, projected to reach 130,062 by 2045. The structure is 145 ft (44.2 m) long and 70 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 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 SB State RTE 280 over Serramonte Boulevard built?
It was built in 1967, making it 58 years old in 2025.
What condition is SB State RTE 280 over Serramonte 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 February 2025.
How much traffic does SB State RTE 280 over Serramonte Boulevard carry?
About 89,000 vehicles per day (2009 count), of which roughly 1% are trucks.
How long is SB State RTE 280 over Serramonte Boulevard?
The structure is 145 ft (44.2 m) long with a longest span of 78 ft (23.8 m) and a deck 70 ft wide.
Who owns SB State RTE 280 over Serramonte Boulevard?
It is owned by the State Highway Agency.