Mariners Isl Blvd over Branch Marina Lagoon
GoodSan Mateo County, California · 0.1 MI W/O Tiller DR · Structure no. 35C0076R
- Built
- 1999
- 26 years old
- Condition
- Good
- inspected April 2023
- Type
- Slab
- Prestressed Concrete Continuous
- Length
- 156 ft
- 3 main spans
- Daily traffic
- 2,970
- 2010 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Mariners Isl Blvd over Branch Marina Lagoon is a prestressed concrete continuous slab carrying Mariners Isl Blvd over Branch Marina Lagoon in San Mateo County, California. It was built in 1999, so it is 26 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 2,970 vehicles a day, roughly 4% of them trucks, projected to reach 3,091 by 2041. The structure is 156 ft (47.5 m) long and 42 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mariners Isl Blvd over Branch Marina Lagoon built?
It was built in 1999, making it 26 years old in 2025.
What condition is Mariners Isl Blvd over Branch Marina Lagoon 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 April 2023.
How much traffic does Mariners Isl Blvd over Branch Marina Lagoon carry?
About 2,970 vehicles per day (2010 count), of which roughly 4% are trucks.
How long is Mariners Isl Blvd over Branch Marina Lagoon?
The structure is 156 ft (47.5 m) long with a longest span of 61 ft (18.7 m) and a deck 42 ft wide.
Who owns Mariners Isl Blvd over Branch Marina Lagoon?
It is owned by the City or Municipal Highway Agency.