US Bridges

San Antonio Road over U.S. Highway 101

Fair

Santa Clara County, California · 04-SCL-101-50.32-PA · Structure no. 37 0146

Built
1960
65 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
278 ft
1 main span
Daily traffic
45,851
2009 count
Owner
State
State Highway Agency

About this bridge

San Antonio Road over U.S. Highway 101 is a prestressed concrete stringer/multi-beam or girder carrying San Antonio Road over U.S. Highway 101 in Santa Clara County, California. It was built in 1960, so it is 65 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 45,851 vehicles a day, roughly 1% of them trucks, projected to reach 62,444 by 2042. The structure is 278 ft (84.7 m) long and 38 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSan Antonio Road
CrossesU.S. Highway 101
Location04-SCL-101-50.32-PA
RouteCity Street 0C003
Coordinates37.42792, -122.10159
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.8 US tons
Inventory rating28.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1 (+3 approach)
Design loadHS 20
Structure length278 ft (84.7 m)
Longest span117 ft (35.7 m)
Deck width38 ft (11.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45,851 (2009)
Projected traffic62,444 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-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 San Antonio Road over U.S. Highway 101 built?

It was built in 1960, making it 65 years old in 2025.

What condition is San Antonio Road 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 2024.

How much traffic does San Antonio Road over U.S. Highway 101 carry?

About 45,851 vehicles per day (2009 count), of which roughly 1% are trucks.

How long is San Antonio Road over U.S. Highway 101?

The structure is 278 ft (84.7 m) long with a longest span of 117 ft (35.7 m) and a deck 38 ft wide.

Who owns San Antonio Road over U.S. Highway 101?

It is owned by the State Highway Agency.