US Bridges

Interstate 280 SB over King Drive

Fair

San Mateo County, California · 04-SM-280-R23.16-DLC · Structure no. 35 0202L

Built
1967
58 years old
Condition
Fair
inspected February 2025
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
159 ft
2 main spans
Daily traffic
89,000
2009 count
Owner
State
State Highway Agency

About this bridge

Interstate 280 SB over King Drive is a concrete continuous box beam or girders - multiple carrying Interstate 280 SB over King Drive 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 89,000 vehicles a day, roughly 1% of them trucks, projected to reach 130,062 by 2045. The structure is 159 ft (48.4 m) long and 70 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesInterstate 280 SB
CrossesKing Drive
Location04-SM-280-R23.16-DLC
RouteInterstate 280
CountySan Mateo County
StateCalifornia
Coordinates37.65193, -122.45393
Functional classUrban Principal Arterial - Interstate

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating45.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length159 ft (48.4 m)
Longest span85 ft (25.8 m)
Deck width70 ft (21.2 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic89,000 (2009)
Projected traffic130,062 by 2045
Trucks1%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Interstate 280 SB over King Drive built?

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

What condition is Interstate 280 SB over King Drive 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 February 2025.

How much traffic does Interstate 280 SB over King Drive carry?

About 89,000 vehicles per day (2009 count), of which roughly 1% are trucks.

How long is Interstate 280 SB over King Drive?

The structure is 159 ft (48.4 m) long with a longest span of 85 ft (25.8 m) and a deck 70 ft wide.

Who owns Interstate 280 SB over King Drive?

It is owned by the State Highway Agency.