US Bridges

Interstate 280 SB over Edgewood Road

Fair

San Mateo County, California · 04-SM-280-6.65 · Structure no. 35 0250L

Built
1973
52 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
199 ft
2 main spans
Daily traffic
50,000
2009 count
Owner
State
State Highway Agency

About this bridge

Interstate 280 SB over Edgewood Road is a concrete continuous box beam or girders - multiple carrying Interstate 280 SB over Edgewood Road in San Mateo County, California. It was built in 1973, so it is 52 years old, younger 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 50,000 vehicles a day, roughly 3% of them trucks, projected to reach 67,280 by 2040. The structure is 199 ft (60.7 m) long and 89 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesInterstate 280 SB
CrossesEdgewood Road
Location04-SM-280-6.65
RouteInterstate 280
CountySan Mateo County
StateCalifornia
Coordinates37.46824, -122.29223
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110 US tons
Inventory rating83.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length199 ft (60.7 m)
Longest span100 ft (30.4 m)
Deck width89 ft (27 m)
Roadway width85 ft (25.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50,000 (2009)
Projected traffic67,280 by 2040
Trucks3%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.8 mi (11 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 Edgewood Road built?

It was built in 1973, making it 52 years old in 2025.

What condition is Interstate 280 SB over Edgewood Road 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 October 2023.

How much traffic does Interstate 280 SB over Edgewood Road carry?

About 50,000 vehicles per day (2009 count), of which roughly 3% are trucks.

How long is Interstate 280 SB over Edgewood Road?

The structure is 199 ft (60.7 m) long with a longest span of 100 ft (30.4 m) and a deck 89 ft wide.

Who owns Interstate 280 SB over Edgewood Road?

It is owned by the State Highway Agency.