US Bridges

N405-E&W105 Connct over 120th Street

Good

Los Angeles County, California · 07-LA-405-R20.72 · Structure no. 53 1240G

Built
1989
36 years old
Condition
Good
inspected November 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
290 ft
3 main spans
Daily traffic
30,001
2019 count
Owner
State
State Highway Agency

About this bridge

N405-E&W105 Connct over 120th Street is a prestressed concrete continuous box beam or girders - multiple carrying N405-E&W105 Connct over 120th Street in Los Angeles County, California. It was built in 1989, so it is 36 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 30,001 vehicles a day, roughly 2% of them trucks, projected to reach 37,506 by 2041. The structure is 290 ft (88.4 m) long and 42 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesN405-E&W105 Connct
Crosses120th Street
Location07-LA-405-R20.72
RouteInterstate 405
Coordinates33.92341, -118.36784
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.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 48 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 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 spans3
Design loadHS 20 + Mod
Structure length290 ft (88.4 m)
Longest span122 ft (37.2 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,001 (2019)
Projected traffic37,506 by 2041
Trucks2%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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 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-E&W105 Connct over 120th Street built?

It was built in 1989, making it 36 years old in 2025.

What condition is N405-E&W105 Connct over 120th Street 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 N405-E&W105 Connct over 120th Street carry?

About 30,001 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is N405-E&W105 Connct over 120th Street?

The structure is 290 ft (88.4 m) long with a longest span of 122 ft (37.2 m) and a deck 42 ft wide.

Who owns N405-E&W105 Connct over 120th Street?

It is owned by the State Highway Agency.