US Bridges

NB 405 Offramp over South Sepulveda Blvd

Good

Los Angeles County, California · 07-LA-405-31.38-LA · Structure no. 53 3021T

Built
2013
12 years old
Condition
Good
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
690 ft
4 main spans
Daily traffic
24,300
2019 count
Owner
State
State Highway Agency

About this bridge

NB 405 Offramp over South Sepulveda Blvd is a prestressed concrete continuous box beam or girders - multiple carrying NB 405 Offramp over South Sepulveda Blvd in Los Angeles County, California. It was built in 2013, so it is 12 years old, younger 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 24,300 vehicles a day, roughly 5% of them trucks, projected to reach 35,021 by 2040. The structure is 690 ft (210.3 m) long and 27 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNB 405 Offramp
CrossesSouth Sepulveda Blvd
Location07-LA-405-31.38-LA
RouteInterstate 405
Coordinates34.05408, -118.45
Functional classUrban Principal Arterial - Interstate

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 2023
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 rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length690 ft (210.3 m)
Longest span189 ft (57.5 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,300 (2019)
Projected traffic35,021 by 2040
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 NB 405 Offramp over South Sepulveda Blvd built?

It was built in 2013, making it 12 years old in 2025.

What condition is NB 405 Offramp over South Sepulveda Blvd 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 2023.

How much traffic does NB 405 Offramp over South Sepulveda Blvd carry?

About 24,300 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is NB 405 Offramp over South Sepulveda Blvd?

The structure is 690 ft (210.3 m) long with a longest span of 189 ft (57.5 m) and a deck 27 ft wide.

Who owns NB 405 Offramp over South Sepulveda Blvd?

It is owned by the State Highway Agency.