US Bridges

NB I-280 Off-Ramp over I-280 & Race Street

Fair

Santa Clara County, California · 04-SCL-280-R3.87-SJS · Structure no. 37 0259S

Built
1972
53 years old
Condition
Fair
inspected February 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
833 ft
2 main spans
Daily traffic
11,900
2002 count
Owner
State
State Highway Agency

About this bridge

NB I-280 Off-Ramp over I-280 & Race Street is a prestressed concrete continuous box beam or girders - multiple carrying NB I-280 Off-Ramp over I-280 & Race Street in Santa Clara County, California. It was built in 1972, so it is 53 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 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 11,900 vehicles a day, roughly 2% of them trucks, projected to reach 19,398 by 2047. The structure is 833 ft (253.9 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesNB I-280 Off-Ramp
CrossesI-280 & Race Street
Location04-SCL-280-R3.87-SJS
RouteInterstate 280
CountySanta Clara County
StateCalifornia
Coordinates37.31537, -121.91081
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
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 (+5 approach)
Design loadHS 20
Structure length833 ft (253.9 m)
Longest span159 ft (48.6 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,900 (2002)
Projected traffic19,398 by 2047
Trucks2%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was NB I-280 Off-Ramp over I-280 & Race Street built?

It was built in 1972, making it 53 years old in 2025.

What condition is NB I-280 Off-Ramp over I-280 & Race Street 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 NB I-280 Off-Ramp over I-280 & Race Street carry?

About 11,900 vehicles per day (2002 count), of which roughly 2% are trucks.

How long is NB I-280 Off-Ramp over I-280 & Race Street?

The structure is 833 ft (253.9 m) long with a longest span of 159 ft (48.6 m) and a deck 26 ft wide.

Who owns NB I-280 Off-Ramp over I-280 & Race Street?

It is owned by the State Highway Agency.