US Bridges

US Highway 101 SB over N405-N101 Connector Ramp

Good

Los Angeles County, California · 07-LA-101-17.07L-LA · Structure no. 53 1145L

Built
1958
67 years old
Condition
Good
inspected May 2024
Type
Slab
Concrete Continuous
Length
108 ft
3 main spans
Daily traffic
229,750
2024 count
Owner
State
State Highway Agency

About this bridge

US Highway 101 SB over N405-N101 Connector Ramp is a concrete continuous slab carrying US Highway 101 SB over N405-N101 Connector Ramp in Los Angeles County, California. It was built in 1958, 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 229,750 vehicles a day, roughly 10% of them trucks, projected to reach 333,694 by 2046. The structure is 108 ft (32.9 m) long and 65 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesUS Highway 101 SB
CrossesN405-N101 Connector Ramp
Location07-LA-101-17.07L-LA
RouteU.S. Route 101
Coordinates34.15951, -118.46792
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 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 rating110 US tons
Inventory rating69.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length108 ft (32.9 m)
Longest span40 ft (12.2 m)
Deck width65 ft (19.7 m)
Roadway width61 ft (18.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic229,750 (2024)
Projected traffic333,694 by 2046
Trucks10%
Lanes on structure5
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 SB over N405-N101 Connector Ramp built?

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

What condition is US Highway 101 SB over N405-N101 Connector Ramp in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.

How much traffic does US Highway 101 SB over N405-N101 Connector Ramp carry?

About 229,750 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is US Highway 101 SB over N405-N101 Connector Ramp?

The structure is 108 ft (32.9 m) long with a longest span of 40 ft (12.2 m) and a deck 65 ft wide.

Who owns US Highway 101 SB over N405-N101 Connector Ramp?

It is owned by the State Highway Agency.