US Bridges

N405-BELLFLOWER Bl over Los Coyotes Diagonal

Good

Los Angeles County, California · 07-LA-405-2.16-LBCH · Structure no. 53 1193S

Built
1963
62 years old
Condition
Good
inspected December 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
447 ft
6 main spans
Daily traffic
50,000
2021 count
Owner
State
State Highway Agency

About this bridge

N405-BELLFLOWER Bl over Los Coyotes Diagonal is a concrete continuous box beam or girders - multiple carrying N405-BELLFLOWER Bl over Los Coyotes Diagonal in Los Angeles County, California. It was built in 1963, so it is 62 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 50,000 vehicles a day, roughly 4% of them trucks, projected to reach 75,937 by 2041. The structure is 447 ft (136.2 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesN405-BELLFLOWER Bl
CrossesLos Coyotes Diagonal
Location07-LA-405-2.16-LBCH
RouteInterstate 405
Coordinates33.80303, -118.12334
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 inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating76.7 US tons
Inventory rating34 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length447 ft (136.2 m)
Longest span102 ft (31.1 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50,000 (2021)
Projected traffic75,937 by 2041
Trucks4%
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 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-BELLFLOWER Bl over Los Coyotes Diagonal built?

It was built in 1963, making it 62 years old in 2025.

What condition is N405-BELLFLOWER Bl over Los Coyotes Diagonal 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 December 2024.

How much traffic does N405-BELLFLOWER Bl over Los Coyotes Diagonal carry?

About 50,000 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is N405-BELLFLOWER Bl over Los Coyotes Diagonal?

The structure is 447 ft (136.2 m) long with a longest span of 102 ft (31.1 m) and a deck 34 ft wide.

Who owns N405-BELLFLOWER Bl over Los Coyotes Diagonal?

It is owned by the State Highway Agency.