I-280 SB Onramp over Los Trancos Creek
GoodSan Mateo County, California · 04-SM-280-R0.01 · Structure no. 35 0009K
- Built
- 1969
- 56 years old
- Condition
- Good
- inspected October 2021
- Type
- Box Beam or Girders - Multiple
- Concrete
- Length
- 75 ft
- 1 main span
- Daily traffic
- 2,100
- 1998 count
- Owner
- State
- State Highway Agency
About this bridge
I-280 SB Onramp over Los Trancos Creek is a concrete box beam or girders - multiple carrying I-280 SB Onramp over Los Trancos 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 2,100 vehicles a day, roughly 2% of them trucks, projected to reach 6,733 by 2038. The structure is 75 ft (22.9 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-280 SB Onramp over Los Trancos Creek built?
It was built in 1969, making it 56 years old in 2025.
What condition is I-280 SB Onramp over Los Trancos Creek in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2021.
How much traffic does I-280 SB Onramp over Los Trancos Creek carry?
About 2,100 vehicles per day (1998 count), of which roughly 2% are trucks.
How long is I-280 SB Onramp over Los Trancos Creek?
The structure is 75 ft (22.9 m) long with a longest span of 73 ft (22.3 m) and a deck 31 ft wide.
Who owns I-280 SB Onramp over Los Trancos Creek?
It is owned by the State Highway Agency.