US Bridges

NB 280 to NB 880 over NB I-280 & I-880 Offramp

Good

Santa Clara County, California · 04-SCL-280-5.34 · Structure no. 37 0673G

Built
2015
10 years old
Condition
Good
inspected February 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
509 ft
4 main spans
Daily traffic
6,000
2015 count
Owner
State
State Highway Agency

About this bridge

NB 280 to NB 880 over NB I-280 & I-880 Offramp is a prestressed concrete continuous box beam or girders - multiple carrying NB 280 to NB 880 over NB I-280 & I-880 Offramp in Santa Clara County, California. It was built in 2015, so it is 10 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,000 vehicles a day, roughly 10% of them trucks, projected to reach 12,242 by 2045. The structure is 509 ft (155.1 m) long and 37 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesNB 280 to NB 880
CrossesNB I-280 & I-880 Offramp
Location04-SCL-280-5.34
RouteState Highway 280
CountySanta Clara County
StateCalifornia
Coordinates37.31883, -121.93911
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length509 ft (155.1 m)
Longest span178 ft (54.3 m)
Deck width37 ft (11.2 m)
Roadway width34 ft (10.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,000 (2015)
Projected traffic12,242 by 2045
Trucks10%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate 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 280 to NB 880 over NB I-280 & I-880 Offramp built?

It was built in 2015, making it 10 years old in 2025.

What condition is NB 280 to NB 880 over NB I-280 & I-880 Offramp in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2025.

How much traffic does NB 280 to NB 880 over NB I-280 & I-880 Offramp carry?

About 6,000 vehicles per day (2015 count), of which roughly 10% are trucks.

How long is NB 280 to NB 880 over NB I-280 & I-880 Offramp?

The structure is 509 ft (155.1 m) long with a longest span of 178 ft (54.3 m) and a deck 37 ft wide.

Who owns NB 280 to NB 880 over NB I-280 & I-880 Offramp?

It is owned by the State Highway Agency.