US Bridges

NB 405 Onramp over South Sepulveda Blvd

Fair

Los Angeles County, California · 07-LA-405-31.61-LA · Structure no. 53 3093S

Built
2013
12 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
114 ft
1 main span
Daily traffic
9,121
2019 count
Owner
State
State Highway Agency

About this bridge

NB 405 Onramp over South Sepulveda Blvd is a prestressed concrete stringer/multi-beam or girder carrying NB 405 Onramp 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 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 9,121 vehicles a day, roughly 5% of them trucks, projected to reach 13,388 by 2040. The structure is 114 ft (34.8 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNB 405 Onramp
CrossesSouth Sepulveda Blvd
Location07-LA-405-31.61-LA
RouteInterstate 405
CountyLos Angeles County
StateCalifornia
Coordinates34.0566, -118.45185
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length114 ft (34.8 m)
Longest span110 ft (33.6 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,121 (2019)
Projected traffic13,388 by 2040
Trucks5%
Lanes on structure1
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 Onramp over South Sepulveda Blvd built?

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

What condition is NB 405 Onramp over South Sepulveda Blvd 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 May 2023.

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

About 9,121 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is NB 405 Onramp over South Sepulveda Blvd?

The structure is 114 ft (34.8 m) long with a longest span of 110 ft (33.6 m) and a deck 33 ft wide.

Who owns NB 405 Onramp over South Sepulveda Blvd?

It is owned by the State Highway Agency.