US Bridges

Lafayette ST (nb) over U.S. Highway 101

Fair

Santa Clara County, California · 04-SCL-101-41.07-SCL · Structure no. 37 0170

Built
1961
64 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
220 ft
2 main spans
Daily traffic
10,000
2001 count
Owner
State
State Highway Agency

About this bridge

Lafayette ST (nb) over U.S. Highway 101 is a prestressed concrete stringer/multi-beam or girder carrying Lafayette ST (nb) over U.S. Highway 101 in Santa Clara County, California. It was built in 1961, so it is 64 years old, older 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 5 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 10,000 vehicles a day, roughly 1% of them trucks, projected to reach 16,686 by 2047. The structure is 220 ft (67.1 m) long and 40 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesLafayette ST (nb)
CrossesU.S. Highway 101
Location04-SCL-101-41.07-SCL
RouteCity Street 0
Coordinates37.3777, -121.94822
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45.7 US tons
Inventory rating35.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length220 ft (67.1 m)
Longest span75 ft (22.9 m)
Deck width40 ft (12.3 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,000 (2001)
Projected traffic16,686 by 2047
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
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 Lafayette ST (nb) over U.S. Highway 101 built?

It was built in 1961, making it 64 years old in 2025.

What condition is Lafayette ST (nb) over U.S. Highway 101 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 Lafayette ST (nb) over U.S. Highway 101 carry?

About 10,000 vehicles per day (2001 count), of which roughly 1% are trucks.

How long is Lafayette ST (nb) over U.S. Highway 101?

The structure is 220 ft (67.1 m) long with a longest span of 75 ft (22.9 m) and a deck 40 ft wide.

Who owns Lafayette ST (nb) over U.S. Highway 101?

It is owned by the State Highway Agency.