US Bridges

U.S. Highway 101 over 280/101 Ic - Alemany Cir

Fair

San Francisco County, California · 04-SF-101-2.03-SF · Structure no. 34 0033

Built
1950
75 years old, rebuilt 2020
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
758 ft
13 main spans
Daily traffic
234,000
2018 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over 280/101 Ic - Alemany Cir is a steel stringer/multi-beam or girder carrying U.S. Highway 101 over 280/101 Ic - Alemany Cir in San Francisco County, California. It was built in 1950 and reconstructed in 2020, so it is 75 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 234,000 vehicles a day, roughly 3% of them trucks, projected to reach 306,058 by 2046. The structure is 758 ft (231 m) long and 88 ft wide.

Location

Open in Google Maps
CarriesU.S. Highway 101
Crosses280/101 Ic - Alemany Cir
Location04-SF-101-2.03-SF
RouteU.S. Route 101
CountySan Francisco County
StateCalifornia
Coordinates37.73605, -122.40712
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.4 US tons
Inventory rating47.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans13
Design loadHS 20
Structure length758 ft (231 m)
Longest span73 ft (22.3 m)
Deck width88 ft (26.8 m)
Roadway width76 ft (23.2 m)
Vertical clearance over deck21 ft (6.4 m)

Traffic and service

Average daily traffic234,000 (2018)
Projected traffic306,058 by 2046
Trucks3%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 U.S. Highway 101 over 280/101 Ic - Alemany Cir built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 2020.

What condition is U.S. Highway 101 over 280/101 Ic - Alemany Cir 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 U.S. Highway 101 over 280/101 Ic - Alemany Cir carry?

About 234,000 vehicles per day (2018 count), of which roughly 3% are trucks.

How long is U.S. Highway 101 over 280/101 Ic - Alemany Cir?

The structure is 758 ft (231 m) long with a longest span of 73 ft (22.3 m) and a deck 88 ft wide.

Who owns U.S. Highway 101 over 280/101 Ic - Alemany Cir?

It is owned by the State Highway Agency.