US Bridges

Bunker Hill Drive over Interstate 280

Fair

San Mateo County, California · 04-SM-280-R12.32 · Structure no. 35 0040

Built
1969
56 years old
Condition
Fair
inspected July 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
260 ft
2 main spans
Daily traffic
3,300
1998 count
Owner
State
State Highway Agency

About this bridge

Bunker Hill Drive over Interstate 280 is a prestressed concrete continuous box beam or girders - multiple carrying Bunker Hill Drive over Interstate 280 in San Mateo County, California. It was built in 1969, so it is 56 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 3,300 vehicles a day, roughly 2% of them trucks, projected to reach 4,168 by 2040. The structure is 260 ft (79.3 m) long and 44 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesBunker Hill Drive
CrossesInterstate 280
Location04-SM-280-R12.32
RouteCounty Highway 0
CountySan Mateo County
StateCalifornia
Coordinates37.52306, -122.35642
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length260 ft (79.3 m)
Longest span130 ft (39.6 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,300 (1998)
Projected traffic4,168 by 2040
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Bunker Hill Drive over Interstate 280 built?

It was built in 1969, making it 56 years old in 2025.

What condition is Bunker Hill Drive over Interstate 280 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 July 2023.

How much traffic does Bunker Hill Drive over Interstate 280 carry?

About 3,300 vehicles per day (1998 count), of which roughly 2% are trucks.

How long is Bunker Hill Drive over Interstate 280?

The structure is 260 ft (79.3 m) long with a longest span of 130 ft (39.6 m) and a deck 44 ft wide.

Who owns Bunker Hill Drive over Interstate 280?

It is owned by the State Highway Agency.