Hillsdale Blvd over Foster City Lagoon
FairSan Mateo County, California · .6 MI N/O Foster City Blv · Structure no. 35C0069
- Built
- 1964
- 61 years old, rebuilt 1983
- Condition
- Fair
- inspected April 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 213 ft
- 5 main spans
- Daily traffic
- 11,372
- 2022 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Hillsdale Blvd over Foster City Lagoon is a prestressed concrete stringer/multi-beam or girder carrying Hillsdale Blvd over Foster City Lagoon in San Mateo County, California. It was built in 1964 and reconstructed in 1983, so it is 61 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 11,372 vehicles a day, roughly 6% of them trucks, projected to reach 16,356 by 2041. The structure is 213 ft (64.9 m) long and 71 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Hillsdale Blvd over Foster City Lagoon built?
It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1983.
What condition is Hillsdale Blvd over Foster City Lagoon in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.
How much traffic does Hillsdale Blvd over Foster City Lagoon carry?
About 11,372 vehicles per day (2022 count), of which roughly 6% are trucks.
How long is Hillsdale Blvd over Foster City Lagoon?
The structure is 213 ft (64.9 m) long with a longest span of 57 ft (17.4 m) and a deck 71 ft wide.
Who owns Hillsdale Blvd over Foster City Lagoon?
It is owned by the City or Municipal Highway Agency.