US Bridges

Haven Ave over Marsh Slough

Fair

San Mateo County, California · 04-SM-000-0.00-MLP · Structure no. 35 0357

Built
1954
71 years old
Condition
Fair
inspected May 2024
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
6,400
2009 count
Owner
State
State Highway Agency

About this bridge

Haven Ave over Marsh Slough is a concrete continuous culvert carrying Haven Ave over Marsh Slough in San Mateo County, California. It was built in 1954, so it is 71 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 6,400 vehicles a day, roughly 10% of them trucks, projected to reach 6,652 by 2046. The structure is 22 ft (6.7 m) long and 42 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesHaven Ave
CrossesMarsh Slough
Location04-SM-000-0.00-MLP
RouteCity Street 0
CountySan Mateo County
StateCalifornia
Coordinates37.48681, -122.18103
Functional classUrban Minor 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,400 (2009)
Projected traffic6,652 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Haven Ave over Marsh Slough built?

It was built in 1954, making it 71 years old in 2025.

What condition is Haven Ave over Marsh Slough 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 May 2024.

How much traffic does Haven Ave over Marsh Slough carry?

About 6,400 vehicles per day (2009 count), of which roughly 10% are trucks.

How long is Haven Ave over Marsh Slough?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m) and a deck 42 ft wide.

Who owns Haven Ave over Marsh Slough?

It is owned by the State Highway Agency.