Whipple Avenue over US Highway 101
GoodSan Mateo County, California · 04-SM-101-6.62-RDWC · Structure no. 35 0122
- Built
- 1958
- 67 years old, rebuilt 1984
- Condition
- Good
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 173 ft
- 2 main spans
- Daily traffic
- 201,000
- 2000 count
- Owner
- State
- State Highway Agency
About this bridge
Whipple Avenue over US Highway 101 is a prestressed concrete stringer/multi-beam or girder carrying Whipple Avenue over US Highway 101 in San Mateo County, California. It was built in 1958 and reconstructed in 1984, so it is 67 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 201,000 vehicles a day, roughly 7% of them trucks, projected to reach 399,464 by 2041. The structure is 173 ft (52.7 m) long and 77 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Whipple Avenue over US Highway 101 built?
It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1984.
What condition is Whipple 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 Whipple Avenue over US Highway 101 carry?
About 201,000 vehicles per day (2000 count), of which roughly 7% are trucks.
How long is Whipple Avenue over US Highway 101?
The structure is 173 ft (52.7 m) long with a longest span of 83 ft (25.3 m) and a deck 77 ft wide.
Who owns Whipple Avenue over US Highway 101?
It is owned by the State Highway Agency.