US Bridges

S1-S35 Connector over State Route 1

Fair

San Mateo County, California · 04-SM-001-R46.65-DLC · Structure no. 35 0204F

Built
1972
53 years old
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
358 ft
2 main spans
Daily traffic
7,500
1998 count
Owner
State
State Highway Agency

About this bridge

S1-S35 Connector over State Route 1 is a prestressed concrete continuous box beam or girders - multiple carrying S1-S35 Connector over State Route 1 in San Mateo County, California. It was built in 1972, so it is 53 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 7,500 vehicles a day, roughly 3% of them trucks, projected to reach 10,408 by 2046. The structure is 358 ft (109.1 m) long and 41 ft wide.

Location

Open in Google Maps
CarriesS1-S35 Connector
CrossesState Route 1
Location04-SM-001-R46.65-DLC
RouteState Highway 1
CountySan Mateo County
StateCalifornia
Coordinates37.66706, -122.48499
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating79.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length358 ft (109.1 m)
Longest span180 ft (54.9 m)
Deck width41 ft (12.5 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,500 (1998)
Projected traffic10,408 by 2046
Trucks3%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 S1-S35 Connector over State Route 1 built?

It was built in 1972, making it 53 years old in 2025.

What condition is S1-S35 Connector over State Route 1 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 October 2024.

How much traffic does S1-S35 Connector over State Route 1 carry?

About 7,500 vehicles per day (1998 count), of which roughly 3% are trucks.

How long is S1-S35 Connector over State Route 1?

The structure is 358 ft (109.1 m) long with a longest span of 180 ft (54.9 m) and a deck 41 ft wide.

Who owns S1-S35 Connector over State Route 1?

It is owned by the State Highway Agency.