US Bridges

U.S. Highway 101 over I-80 & US 101 Ramps Strs

Fair

San Francisco County, California · 04-SF-101-R4.25L-SF · Structure no. 34 0077

Built
1955
70 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
10,055 ft
103 main spans
Daily traffic
59,000
2019 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over I-80 & US 101 Ramps Strs is a steel stringer/multi-beam or girder carrying U.S. Highway 101 over I-80 & US 101 Ramps Strs in San Francisco County, California. It was built in 1955, so it is 70 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 59,000 vehicles a day, roughly 1% of them trucks, projected to reach 38,200 by 2041. The structure is 10,055 ft (3,064.7 m) long and 80 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesU.S. Highway 101
CrossesI-80 & US 101 Ramps Strs
Location04-SF-101-R4.25L-SF
RouteU.S. Route 101
CountySan Francisco County
StateCalifornia
Coordinates37.76989, -122.41848
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59 US tons
Inventory rating26.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans103 (+52 approach)
Design loadH 20
Structure length10,055 ft (3,064.7 m)
Longest span106 ft (32.2 m)
Deck width80 ft (24.4 m)
Roadway width76 ft (23.2 m)
Vertical clearance over deck14 ft (4.4 m)

Traffic and service

Average daily traffic59,000 (2019)
Projected traffic38,200 by 2041
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and railroad
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 U.S. Highway 101 over I-80 & US 101 Ramps Strs built?

It was built in 1955, making it 70 years old in 2025.

What condition is U.S. Highway 101 over I-80 & US 101 Ramps Strs 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 April 2023.

How much traffic does U.S. Highway 101 over I-80 & US 101 Ramps Strs carry?

About 59,000 vehicles per day (2019 count), of which roughly 1% are trucks.

How long is U.S. Highway 101 over I-80 & US 101 Ramps Strs?

The structure is 10,055 ft (3,064.7 m) long with a longest span of 106 ft (32.2 m) and a deck 80 ft wide.

Who owns U.S. Highway 101 over I-80 & US 101 Ramps Strs?

It is owned by the State Highway Agency.