US Bridges

S405-W105 Connectr over Imperial LA Cienega Ramp

Good

Los Angeles County, California · 07-LA-405-R21.42-LA · Structure no. 53 2438F

Built
1994
31 years old
Condition
Good
inspected November 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
1,442 ft
9 main spans
Daily traffic
3,500
2019 count
Owner
State
State Highway Agency

About this bridge

S405-W105 Connectr over Imperial LA Cienega Ramp is a prestressed concrete continuous box beam or girders - multiple carrying S405-W105 Connectr over Imperial LA Cienega Ramp 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 3,500 vehicles a day, roughly 2% of them trucks, projected to reach 4,842 by 2041. The structure is 1,442 ft (439.5 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesS405-W105 Connectr
CrossesImperial LA Cienega Ramp
Location07-LA-405-R21.42-LA
RouteInterstate 405
Coordinates33.93062, -118.37141
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
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 spans9
Design loadHS 20 + Mod
Structure length1,442 ft (439.5 m)
Longest span213 ft (64.9 m)
Deck width30 ft (9.2 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,500 (2019)
Projected traffic4,842 by 2041
Trucks2%
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 statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was S405-W105 Connectr over Imperial LA Cienega Ramp built?

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

What condition is S405-W105 Connectr over Imperial LA Cienega Ramp 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 November 2024.

How much traffic does S405-W105 Connectr over Imperial LA Cienega Ramp carry?

About 3,500 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is S405-W105 Connectr over Imperial LA Cienega Ramp?

The structure is 1,442 ft (439.5 m) long with a longest span of 213 ft (64.9 m) and a deck 30 ft wide.

Who owns S405-W105 Connectr over Imperial LA Cienega Ramp?

It is owned by the State Highway Agency.