US Bridges

NB Interstate 280 over 1st ST 2nd 3rd

Fair

Santa Clara County, California · 04-SCL-280-R1.85-SJS · Structure no. 37 0279R

Built
1972
53 years old
Condition
Fair
inspected January 2025
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
838 ft
6 main spans
Daily traffic
111,700
2019 count
Owner
State
State Highway Agency

About this bridge

NB Interstate 280 over 1st ST 2nd 3rd is a concrete continuous box beam or girders - multiple carrying NB Interstate 280 over 1st ST 2nd 3rd 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 111,700 vehicles a day, roughly 3% of them trucks, projected to reach 153,208 by 2045. The structure is 838 ft (255.5 m) long and 92 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesNB Interstate 280
Crosses1st ST 2nd 3rd
Location04-SCL-280-R1.85-SJS
RouteInterstate 280
CountySanta Clara County
StateCalifornia
Coordinates37.3275, -121.88104
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 inspectionJanuary 2025
Inspection intervalevery 48 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 rating110 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6 (+1 approach)
Design loadHS 20 + Mod
Structure length838 ft (255.5 m)
Longest span155 ft (47.2 m)
Deck width92 ft (28 m)
Roadway width90 ft (27.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic111,700 (2019)
Projected traffic153,208 by 2045
Trucks3%
Lanes on structure6
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 NB Interstate 280 over 1st ST 2nd 3rd built?

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

What condition is NB Interstate 280 over 1st ST 2nd 3rd 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 January 2025.

How much traffic does NB Interstate 280 over 1st ST 2nd 3rd carry?

About 111,700 vehicles per day (2019 count), of which roughly 3% are trucks.

How long is NB Interstate 280 over 1st ST 2nd 3rd?

The structure is 838 ft (255.5 m) long with a longest span of 155 ft (47.2 m) and a deck 92 ft wide.

Who owns NB Interstate 280 over 1st ST 2nd 3rd?

It is owned by the State Highway Agency.