US Bridges

S405-N110/110 Sep over Interstate 110

Good

Los Angeles County, California · 07-LA-405-12.94-LA · Structure no. 53 1045F

Built
1961
64 years old
Condition
Good
inspected May 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
234 ft
4 main spans
Daily traffic
24,902
2019 count
Owner
State
State Highway Agency

About this bridge

S405-N110/110 Sep over Interstate 110 is a concrete continuous box beam or girders - multiple carrying S405-N110/110 Sep over Interstate 110 in Los Angeles County, California. It was built in 1961, 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 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 24,902 vehicles a day, roughly 2% of them trucks, projected to reach 30,717 by 2046. The structure is 234 ft (71.3 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesS405-N110/110 Sep
CrossesInterstate 110
Location07-LA-405-12.94-LA
RouteInterstate 405
Coordinates33.85603, -118.28442
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 2024
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 alignment9: Superior to present desirable criteria
Operating rating50 US tons
Inventory rating35.7 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length234 ft (71.3 m)
Longest span84 ft (25.6 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,902 (2019)
Projected traffic30,717 by 2046
Trucks2%
Lanes on structure1
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 S405-N110/110 Sep over Interstate 110 built?

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

What condition is S405-N110/110 Sep over Interstate 110 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 S405-N110/110 Sep over Interstate 110 carry?

About 24,902 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is S405-N110/110 Sep over Interstate 110?

The structure is 234 ft (71.3 m) long with a longest span of 84 ft (25.6 m) and a deck 34 ft wide.

Who owns S405-N110/110 Sep over Interstate 110?

It is owned by the State Highway Agency.