US Bridges

N405-HUGHES Pkwy over I 405 & On- Ramps

Good

Los Angeles County, California · 07-LA-405-24.56-LA · Structure no. 53 2724S

Built
1994
31 years old
Condition
Good
inspected January 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
988 ft
6 main spans
Daily traffic
10,000
2015 count
Owner
State
State Highway Agency

About this bridge

N405-HUGHES Pkwy over I 405 & On- Ramps is a prestressed concrete continuous box beam or girders - multiple carrying N405-HUGHES Pkwy over I 405 & On- Ramps in Los Angeles County, California. It was built in 1994, so it is 31 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 10,000 vehicles a day, roughly 1% of them trucks, projected to reach 11,757 by 2043. The structure is 988 ft (301.1 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesN405-HUGHES Pkwy
CrossesI 405 & On- Ramps
Location07-LA-405-24.56-LA
RouteInterstate 405
Coordinates33.97472, -118.38439
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 inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20 + Mod
Structure length988 ft (301.1 m)
Longest span198 ft (60.4 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,000 (2015)
Projected traffic11,757 by 2043
Trucks1%
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 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 N405-HUGHES Pkwy over I 405 & On- Ramps built?

It was built in 1994, making it 31 years old in 2025.

What condition is N405-HUGHES Pkwy over I 405 & On- Ramps 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 January 2025.

How much traffic does N405-HUGHES Pkwy over I 405 & On- Ramps carry?

About 10,000 vehicles per day (2015 count), of which roughly 1% are trucks.

How long is N405-HUGHES Pkwy over I 405 & On- Ramps?

The structure is 988 ft (301.1 m) long with a longest span of 198 ft (60.4 m) and a deck 35 ft wide.

Who owns N405-HUGHES Pkwy over I 405 & On- Ramps?

It is owned by the State Highway Agency.