State Route 1 NB over Interstate 280
GoodSan Mateo County, California · 04-SM-001-R47.76-DLC · Structure no. 35 0180R
- Built
- 1967
- 58 years old
- Condition
- Good
- inspected October 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 447 ft
- 4 main spans
- Daily traffic
- 32,500
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 1 NB over Interstate 280 is a concrete continuous box beam or girders - multiple carrying State Route 1 NB over Interstate 280 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 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 32,500 vehicles a day, roughly 2% of them trucks, projected to reach 49,182 by 2046. The structure is 447 ft (136.3 m) long and 52 ft wide. If it were closed, the detour would be 1.9 mi (3 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 1 NB over Interstate 280 built?
It was built in 1967, making it 58 years old in 2025.
What condition is State Route 1 NB over Interstate 280 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 2024.
How much traffic does State Route 1 NB over Interstate 280 carry?
About 32,500 vehicles per day (2009 count), of which roughly 2% are trucks.
How long is State Route 1 NB over Interstate 280?
The structure is 447 ft (136.3 m) long with a longest span of 158 ft (48.2 m) and a deck 52 ft wide.
Who owns State Route 1 NB over Interstate 280?
It is owned by the State Highway Agency.