US Bridges

San Bruno Avenue over San Bruno Canal

Fair

San Mateo County, California · 04-SM-101-R20.39 · Structure no. 35 0128Y

Built
1947
78 years old
Condition
Fair
inspected April 2021
Type
Culvert
Concrete Continuous
Length
34 ft
3 main spans
Daily traffic
10,100
2000 count
Owner
State
State Highway Agency

About this bridge

San Bruno Avenue over San Bruno Canal is a concrete continuous culvert carrying San Bruno Avenue over San Bruno Canal in San Mateo County, California. It was built in 1947, so it is 78 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 10,100 vehicles a day, roughly 3% of them trucks, projected to reach 16,033 by 2038. The structure is 34 ft (10.4 m) long. If it were closed, the detour would be 6.2 mi (10 km).

CarriesSan Bruno Avenue
CrossesSan Bruno Canal
Location04-SM-101-R20.39
RouteU.S. Route 101
Coordinates37.63082, -122.40524
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadUnknown
Structure length34 ft (10.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,100 (2000)
Projected traffic16,033 by 2038
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemYes

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 San Bruno Avenue over San Bruno Canal built?

It was built in 1947, making it 78 years old in 2025.

What condition is San Bruno Avenue over San Bruno Canal 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 2021.

How much traffic does San Bruno Avenue over San Bruno Canal carry?

About 10,100 vehicles per day (2000 count), of which roughly 3% are trucks.

How long is San Bruno Avenue over San Bruno Canal?

The structure is 34 ft (10.4 m) long with a longest span of 10 ft (3 m).

Who owns San Bruno Avenue over San Bruno Canal?

It is owned by the State Highway Agency.