US Bridges

Oyster POINT-S101 over US Highway 101

Fair

San Mateo County, California · 04-SM-101-22.70-SSF · Structure no. 35 0318K

Built
1995
30 years old
Condition
Fair
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
446 ft
3 main spans
Daily traffic
8,000
1998 count
Owner
State
State Highway Agency

About this bridge

Oyster POINT-S101 over US Highway 101 is a prestressed concrete continuous box beam or girders - multiple carrying Oyster POINT-S101 over US Highway 101 in San Mateo County, California. It was built in 1995, so it is 30 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 8,000 vehicles a day, roughly 5% of them trucks, projected to reach 13,041 by 2040. The structure is 446 ft (136 m) long and 39 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesOyster POINT-S101
CrossesUS Highway 101
Location04-SM-101-22.70-SSF
RouteU.S. Route 101
Coordinates37.6624, -122.40161
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionApril 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 alignment6: Equal to present minimum criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length446 ft (136 m)
Longest span175 ft (53.4 m)
Deck width39 ft (12 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,000 (1998)
Projected traffic13,041 by 2040
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 Oyster POINT-S101 over US Highway 101 built?

It was built in 1995, making it 30 years old in 2025.

What condition is Oyster POINT-S101 over US 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 April 2023.

How much traffic does Oyster POINT-S101 over US Highway 101 carry?

About 8,000 vehicles per day (1998 count), of which roughly 5% are trucks.

How long is Oyster POINT-S101 over US Highway 101?

The structure is 446 ft (136 m) long with a longest span of 175 ft (53.4 m) and a deck 39 ft wide.

Who owns Oyster POINT-S101 over US Highway 101?

It is owned by the State Highway Agency.