US Bridges

Fashion Island DR over Marina Lagoon

Fair

San Mateo County, California · 0.5 MI E of S Norfolk ST · Structure no. 35C0160

Built
1967
58 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
619 ft
8 main spans
Daily traffic
13,240
2015 count
Owner
City
City or Municipal Highway Agency

About this bridge

Fashion Island DR over Marina Lagoon is a prestressed concrete continuous stringer/multi-beam or girder carrying Fashion Island DR over Marina Lagoon 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 fair condition with a lowest component rating of 5 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 13,240 vehicles a day, roughly 9% of them trucks, projected to reach 44,316 by 2041. The structure is 619 ft (188.7 m) long and 61 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesFashion Island DR
CrossesMarina Lagoon
Location0.5 MI E of S Norfolk ST
RouteCity Street 0
CountySan Mateo County
StateCalifornia
Coordinates37.55506, -122.29041
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating38.6 US tons
Inventory rating25.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length619 ft (188.7 m)
Longest span62 ft (18.9 m)
Deck width61 ft (18.6 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,240 (2015)
Projected traffic44,316 by 2041
Trucks9%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Fashion Island DR over Marina Lagoon built?

It was built in 1967, making it 58 years old in 2025.

What condition is Fashion Island DR over Marina 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 Fashion Island DR over Marina Lagoon carry?

About 13,240 vehicles per day (2015 count), of which roughly 9% are trucks.

How long is Fashion Island DR over Marina Lagoon?

The structure is 619 ft (188.7 m) long with a longest span of 62 ft (18.9 m) and a deck 61 ft wide.

Who owns Fashion Island DR over Marina Lagoon?

It is owned by the City or Municipal Highway Agency.