US Bridges

SB Route 101 Onrmp over Alemany Cir

Fair

San Francisco County, California · 04-SF-101-2.00-SF · Structure no. 34 0064K

Built
1954
71 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
390 ft
6 main spans
Daily traffic
3,200
2018 count
Owner
State
State Highway Agency

About this bridge

SB Route 101 Onrmp over Alemany Cir is a steel stringer/multi-beam or girder carrying SB Route 101 Onrmp over Alemany Cir in San Francisco County, California. It was built in 1954, so it is 71 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 3,200 vehicles a day, roughly 3% of them trucks, projected to reach 9,461 by 2046. The structure is 390 ft (118.9 m) long and 27 ft wide.

Location

Open in Google Maps
CarriesSB Route 101 Onrmp
CrossesAlemany Cir
Location04-SF-101-2.00-SF
RouteU.S. Route 101
CountySan Francisco County
StateCalifornia
Coordinates37.73587, -122.40737
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating76.4 US tons
Inventory rating45.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length390 ft (118.9 m)
Longest span68 ft (20.7 m)
Deck width27 ft (8.2 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deck16 ft (5 m)

Traffic and service

Average daily traffic3,200 (2018)
Projected traffic9,461 by 2046
Trucks3%
Lanes on structure1
Traffic directionOne-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 SB Route 101 Onrmp over Alemany Cir built?

It was built in 1954, making it 71 years old in 2025.

What condition is SB Route 101 Onrmp over 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 SB Route 101 Onrmp over Alemany Cir carry?

About 3,200 vehicles per day (2018 count), of which roughly 3% are trucks.

How long is SB Route 101 Onrmp over Alemany Cir?

The structure is 390 ft (118.9 m) long with a longest span of 68 ft (20.7 m) and a deck 27 ft wide.

Who owns SB Route 101 Onrmp over Alemany Cir?

It is owned by the State Highway Agency.