US Bridges

Interstate 405 over SR 118

Fair

Los Angeles County, California · 07-LA-405-46.83-LA · Structure no. 53 2211

Built
1977
48 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
274 ft
2 main spans
Daily traffic
209,000
2019 count
Owner
State
State Highway Agency

About this bridge

Interstate 405 over SR 118 is a prestressed concrete continuous box beam or girders - multiple carrying Interstate 405 over SR 118 in Los Angeles County, California. It was built in 1977, so it is 48 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 5 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 209,000 vehicles a day, roughly 10% of them trucks, projected to reach 271,205 by 2041. The structure is 274 ft (83.5 m) long and 155 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesInterstate 405
CrossesSR 118
Location07-LA-405-46.83-LA
RouteInterstate 405
CountyLos Angeles County
StateCalifornia
Coordinates34.26554, -118.47184
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.2 US tons
Inventory rating36.4 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2 (+1 approach)
Design loadHS 20
Structure length274 ft (83.5 m)
Longest span120 ft (36.6 m)
Deck width155 ft (47.2 m)
Roadway width148 ft (45 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic209,000 (2019)
Projected traffic271,205 by 2041
Trucks10%
Lanes on structure11
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 SR 118 built?

It was built in 1977, making it 48 years old in 2025.

What condition is Interstate 405 over SR 118 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 October 2023.

How much traffic does Interstate 405 over SR 118 carry?

About 209,000 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is Interstate 405 over SR 118?

The structure is 274 ft (83.5 m) long with a longest span of 120 ft (36.6 m) and a deck 155 ft wide.

Who owns Interstate 405 over SR 118?

It is owned by the State Highway Agency.