US Bridges

Access Road over San Bruno Channel

Fair

San Mateo County, California · North of North Access RD · Structure no. 35C0164

Built
1948
77 years old
Condition
Fair
inspected April 2023
Type
Culvert
Concrete Continuous
Length
28 ft
4 main spans
Daily traffic
8,252
2011 count
Owner
City
City or Municipal Highway Agency

About this bridge

Access Road over San Bruno Channel is a concrete continuous culvert carrying Access Road over San Bruno Channel in San Mateo County, California. It was built in 1948, so it is 77 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 8,252 vehicles a day, roughly 30% of them trucks, projected to reach 15,000 by 2041. The structure is 28 ft (8.5 m) long and 47 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesAccess Road
CrossesSan Bruno Channel
LocationNorth of North Access RD
RouteCity Street 0
CountySan Mateo County
StateCalifornia
Coordinates37.6388, -122.39659
Functional classUrban Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans4
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span6 ft (1.8 m)
Deck width47 ft (14.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,252 (2011)
Projected traffic15,000 by 2041
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

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 Access Road over San Bruno Channel built?

It was built in 1948, making it 77 years old in 2025.

What condition is Access Road over San Bruno Channel 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 Access Road over San Bruno Channel carry?

About 8,252 vehicles per day (2011 count), of which roughly 30% are trucks.

How long is Access Road over San Bruno Channel?

The structure is 28 ft (8.5 m) long with a longest span of 6 ft (1.8 m) and a deck 47 ft wide.

Who owns Access Road over San Bruno Channel?

It is owned by the City or Municipal Highway Agency.