US Bridges

Leigh Avenue over Interstate 280

Good

Santa Clara County, California · 04-SCL-280-R4.50-SJS · Structure no. 37 0256

Built
1972
53 years old
Condition
Good
inspected February 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
231 ft
2 main spans
Daily traffic
27,600
2002 count
Owner
State
State Highway Agency

About this bridge

Leigh Avenue over Interstate 280 is a prestressed concrete continuous box beam or girders - multiple carrying Leigh Avenue over Interstate 280 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 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 27,600 vehicles a day, roughly 2% of them trucks, projected to reach 44,992 by 2047. The structure is 231 ft (70.4 m) long and 74 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesLeigh Avenue
CrossesInterstate 280
Location04-SCL-280-R4.50-SJS
RouteCity Street 0
CountySanta Clara County
StateCalifornia
Coordinates37.31655, -121.92372
Functional classUrban Minor Arterial

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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating94.2 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
Structure length231 ft (70.4 m)
Longest span125 ft (38.1 m)
Deck width74 ft (22.6 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,600 (2002)
Projected traffic44,992 by 2047
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 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 Leigh Avenue over Interstate 280 built?

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

What condition is Leigh Avenue over Interstate 280 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 Leigh Avenue over Interstate 280 carry?

About 27,600 vehicles per day (2002 count), of which roughly 2% are trucks.

How long is Leigh Avenue over Interstate 280?

The structure is 231 ft (70.4 m) long with a longest span of 125 ft (38.1 m) and a deck 74 ft wide.

Who owns Leigh Avenue over Interstate 280?

It is owned by the State Highway Agency.