US Bridges

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

Good

Santa Clara County, California · 04-SCL-101-41.08-SCL · Structure no. 37 0391

Built
1975
50 years old
Condition
Good
inspected February 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
224 ft
2 main spans
Daily traffic
12,500
2001 count
Owner
State
State Highway Agency

About this bridge

Lafayette ST (sb) over U.S. Highway 101 is a prestressed concrete continuous box beam or girders - multiple carrying Lafayette ST (sb) over U.S. Highway 101 in Santa Clara County, California. It was built in 1975, so it is 50 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 12,500 vehicles a day, roughly 1% of them trucks, projected to reach 15,664 by 2043. The structure is 224 ft (68.3 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesLafayette ST (sb)
CrossesU.S. Highway 101
Location04-SCL-101-41.08-SCL
RouteCity Street 0
Coordinates37.37774, -121.94839
Functional classUrban Other Principal 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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating64.3 US tons
Inventory rating46.4 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length224 ft (68.3 m)
Longest span112 ft (34 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,500 (2001)
Projected traffic15,664 by 2043
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 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 (sb) over U.S. Highway 101 built?

It was built in 1975, making it 50 years old in 2025.

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

About 12,500 vehicles per day (2001 count), of which roughly 1% are trucks.

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

The structure is 224 ft (68.3 m) long with a longest span of 112 ft (34 m) and a deck 35 ft wide.

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

It is owned by the State Highway Agency.