US Bridges

Interstate 405 over N110-N405 Connector Ramp

Fair

Los Angeles County, California · 07-LA-405-12.83-CRSN · Structure no. 53 1138

Built
1961
64 years old, rebuilt 1999
Condition
Fair
inspected May 2024
Type
Slab
Concrete
Length
87 ft
1 main span
Daily traffic
265,000
2019 count
Owner
State
State Highway Agency

About this bridge

Interstate 405 over N110-N405 Connector Ramp is a concrete slab carrying Interstate 405 over N110-N405 Connector Ramp in Los Angeles County, California. It was built in 1961 and reconstructed in 1999, so it is 64 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 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 265,000 vehicles a day, roughly 5% of them trucks, projected to reach 309,020 by 2046. The structure is 87 ft (26.5 m) long and 142 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesInterstate 405
CrossesN110-N405 Connector Ramp
Location07-LA-405-12.83-CRSN
RouteInterstate 405
CountyLos Angeles County
StateCalifornia
Coordinates33.85586, -118.28304
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating67.9 US tons
Inventory rating41 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length87 ft (26.5 m)
Longest span87 ft (26.5 m)
Deck width142 ft (43.2 m)
Roadway width135 ft (41.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic265,000 (2019)
Projected traffic309,020 by 2046
Trucks5%
Lanes on structure10
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 Interstate 405 over N110-N405 Connector Ramp built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1999.

What condition is Interstate 405 over N110-N405 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 May 2024.

How much traffic does Interstate 405 over N110-N405 Connector Ramp carry?

About 265,000 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is Interstate 405 over N110-N405 Connector Ramp?

The structure is 87 ft (26.5 m) long with a longest span of 87 ft (26.5 m) and a deck 142 ft wide.

Who owns Interstate 405 over N110-N405 Connector Ramp?

It is owned by the State Highway Agency.