US Bridges

S101-S280 Connecto over 280/101 Ic -Alemany Blvd

Fair

San Francisco County, California · 04-SF-101-1.94-SF · Structure no. 34 0071F

Built
1960
65 years old
Condition
Fair
inspected January 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
1,256 ft
14 main spans
Daily traffic
56,000
2019 count
Owner
State
State Highway Agency

About this bridge

S101-S280 Connecto over 280/101 Ic -Alemany Blvd is a concrete continuous box beam or girders - multiple carrying S101-S280 Connecto over 280/101 Ic -Alemany Blvd in San Francisco 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 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 56,000 vehicles a day, roughly 4% of them trucks, projected to reach 112,477 by 2046. The structure is 1,256 ft (382.8 m) long and 38 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesS101-S280 Connecto
Crosses280/101 Ic -Alemany Blvd
Location04-SF-101-1.94-SF
RouteU.S. Route 101
CountySan Francisco County
StateCalifornia
Coordinates37.73486, -122.40972
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 inspectionJanuary 2024
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 alignment8: Equal to present desirable criteria
Operating rating110 US tons
Inventory rating66.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans14
Design loadHS 20
Structure length1,256 ft (382.8 m)
Longest span100 ft (30.5 m)
Deck width38 ft (11.5 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic56,000 (2019)
Projected traffic112,477 by 2046
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 S101-S280 Connecto over 280/101 Ic -Alemany Blvd built?

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

What condition is S101-S280 Connecto over 280/101 Ic -Alemany Blvd 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 January 2024.

How much traffic does S101-S280 Connecto over 280/101 Ic -Alemany Blvd carry?

About 56,000 vehicles per day (2019 count), of which roughly 4% are trucks.

How long is S101-S280 Connecto over 280/101 Ic -Alemany Blvd?

The structure is 1,256 ft (382.8 m) long with a longest span of 100 ft (30.5 m) and a deck 38 ft wide.

Who owns S101-S280 Connecto over 280/101 Ic -Alemany Blvd?

It is owned by the State Highway Agency.