US Bridges

I-680 On/Off-Ramp over Capitol Expressway

Fair

Santa Clara County, California · 04-SCL-680-M1.41-SJS · Structure no. 37 0288K

Built
1974
51 years old
Condition
Fair
inspected July 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
202 ft
2 main spans
Daily traffic
14,800
2009 count
Owner
State
State Highway Agency

About this bridge

I-680 On/Off-Ramp over Capitol Expressway is a prestressed concrete continuous box beam or girders - multiple carrying I-680 On/Off-Ramp over Capitol Expressway in Santa Clara County, California. It was built in 1974, so it is 51 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 14,800 vehicles a day, roughly 3% of them trucks, projected to reach 43,614 by 2041. The structure is 202 ft (61.6 m) long and 38 ft wide.

Location

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CarriesI-680 On/Off-Ramp
CrossesCapitol Expressway
Location04-SCL-680-M1.41-SJS
RouteInterstate 680
CountySanta Clara County
StateCalifornia
Coordinates37.35537, -121.83889
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 inspectionJuly 2023
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 alignment8: Equal to present desirable criteria
Operating rating65.7 US tons
Inventory rating44.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length202 ft (61.6 m)
Longest span100 ft (30.5 m)
Deck width38 ft (11.6 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,800 (2009)
Projected traffic43,614 by 2041
Trucks3%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 I-680 On/Off-Ramp over Capitol Expressway built?

It was built in 1974, making it 51 years old in 2025.

What condition is I-680 On/Off-Ramp over Capitol Expressway 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 July 2023.

How much traffic does I-680 On/Off-Ramp over Capitol Expressway carry?

About 14,800 vehicles per day (2009 count), of which roughly 3% are trucks.

How long is I-680 On/Off-Ramp over Capitol Expressway?

The structure is 202 ft (61.6 m) long with a longest span of 100 ft (30.5 m) and a deck 38 ft wide.

Who owns I-680 On/Off-Ramp over Capitol Expressway?

It is owned by the State Highway Agency.