US Bridges

US Highway 101 NB over S405-S101 Connector Ramp

Fair

Los Angeles County, California · 07-LA-101-17.29R-LA · Structure no. 53 1147R

Built
1958
67 years old, rebuilt 1971
Condition
Fair
inspected March 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
179 ft
3 main spans
Daily traffic
229,750
2018 count
Owner
State
State Highway Agency

About this bridge

US Highway 101 NB over S405-S101 Connector Ramp is a prestressed concrete box beam or girders - multiple carrying US Highway 101 NB over S405-S101 Connector Ramp in Los Angeles County, California. It was built in 1958 and reconstructed in 1971, so it is 67 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 229,750 vehicles a day, roughly 10% of them trucks, projected to reach 335,694 by 2045. The structure is 179 ft (54.6 m) long and 80 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUS Highway 101 NB
CrossesS405-S101 Connector Ramp
Location07-LA-101-17.29R-LA
RouteU.S. Route 101
CountyLos Angeles County
StateCalifornia
Coordinates34.16214, -118.47073
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 inspectionMarch 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 alignment8: Equal to present desirable criteria
Operating rating84.7 US tons
Inventory rating51 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length179 ft (54.6 m)
Longest span78 ft (23.8 m)
Deck width80 ft (24.3 m)
Roadway width76 ft (23.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic229,750 (2018)
Projected traffic335,694 by 2045
Trucks10%
Lanes on structure6
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate 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 US Highway 101 NB over S405-S101 Connector Ramp built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1971.

What condition is US Highway 101 NB over S405-S101 Connector Ramp 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 March 2024.

How much traffic does US Highway 101 NB over S405-S101 Connector Ramp carry?

About 229,750 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is US Highway 101 NB over S405-S101 Connector Ramp?

The structure is 179 ft (54.6 m) long with a longest span of 78 ft (23.8 m) and a deck 80 ft wide.

Who owns US Highway 101 NB over S405-S101 Connector Ramp?

It is owned by the State Highway Agency.