US Bridges

U.S. Highway 101 over Bacon Street

Fair

San Francisco County, California · 04-SF-101-1.41-SF · Structure no. 34 0057L

Built
1954
71 years old
Condition
Fair
inspected January 2024
Type
Slab
Prestressed Concrete
Length
63 ft
1 main span
Daily traffic
98,000
2019 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over Bacon Street is a prestressed concrete slab carrying U.S. Highway 101 over Bacon Street 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 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 98,000 vehicles a day, roughly 4% of them trucks, projected to reach 135,016 by 2046. The structure is 63 ft (19.2 m) long and 100 ft wide.

CarriesU.S. Highway 101
CrossesBacon Street
Location04-SF-101-1.41-SF
RouteU.S. Route 101
Coordinates37.72779, -122.40277
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 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 alignment8: Equal to present desirable criteria
Operating rating76.1 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length63 ft (19.2 m)
Longest span63 ft (19.2 m)
Deck width100 ft (30.4 m)
Roadway width94 ft (28.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic98,000 (2019)
Projected traffic135,016 by 2046
Trucks4%
Lanes on structure5
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 U.S. Highway 101 over Bacon Street built?

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

What condition is U.S. Highway 101 over Bacon Street 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 Bacon Street carry?

About 98,000 vehicles per day (2019 count), of which roughly 4% are trucks.

How long is U.S. Highway 101 over Bacon Street?

The structure is 63 ft (19.2 m) long with a longest span of 63 ft (19.2 m) and a deck 100 ft wide.

Who owns U.S. Highway 101 over Bacon Street?

It is owned by the State Highway Agency.