Ralston Avenue over US Highway 101
GoodSan Mateo County, California · 04-SM-101-9.55-BMT · Structure no. 35 0114
- Built
- 1974
- 51 years old
- Condition
- Good
- inspected August 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 263 ft
- 2 main spans
- Daily traffic
- 37,234
- 1998 count
- Owner
- State
- State Highway Agency
About this bridge
Ralston Avenue over US Highway 101 is a prestressed concrete continuous box beam or girders - multiple carrying Ralston Avenue over US Highway 101 in San Mateo County, California. It was built in 1974, so it is 51 years old, younger 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 37,234 vehicles a day, roughly 2% of them trucks, projected to reach 81,198 by 2041. The structure is 263 ft (80.2 m) long and 94 ft wide. If it were closed, the detour would be 3.1 mi (5 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 Ralston Avenue over US Highway 101 built?
It was built in 1974, making it 51 years old in 2025.
What condition is Ralston Avenue over US Highway 101 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 August 2023.
How much traffic does Ralston Avenue over US Highway 101 carry?
About 37,234 vehicles per day (1998 count), of which roughly 2% are trucks.
How long is Ralston Avenue over US Highway 101?
The structure is 263 ft (80.2 m) long with a longest span of 132 ft (40.2 m) and a deck 94 ft wide.
Who owns Ralston Avenue over US Highway 101?
It is owned by the State Highway Agency.