US Bridges

Interstate 405 over Los Alamitos Channel

Fair

Orange County, California · 12-ORA-405-24.10-SLB · Structure no. 55 0441

Built
1965
60 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete
Length
36 ft
3 main spans
Daily traffic
255,000
2014 count
Owner
State
State Highway Agency

About this bridge

Interstate 405 over Los Alamitos Channel is a concrete culvert carrying Interstate 405 over Los Alamitos Channel in Orange County, California. It was built in 1965, so it is 60 years old, older 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 6 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 255,000 vehicles a day, roughly 3% of them trucks, projected to reach 319,000 by 2040. The structure is 36 ft (11 m) long and 169 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesInterstate 405
CrossesLos Alamitos Channel
Location12-ORA-405-24.10-SLB
RouteInterstate 405
CountyOrange County
StateCalifornia
Coordinates33.7855, -118.09242
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20 + Mod
Structure length36 ft (11 m)
Longest span12 ft (3.7 m)
Deck width169 ft (51.6 m)
Roadway width166 ft (50.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic255,000 (2014)
Projected traffic319,000 by 2040
Trucks3%
Lanes on structure10
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Interstate 405 over Los Alamitos Channel built?

It was built in 1965, making it 60 years old in 2025.

What condition is Interstate 405 over Los Alamitos Channel 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 September 2023.

How much traffic does Interstate 405 over Los Alamitos Channel carry?

About 255,000 vehicles per day (2014 count), of which roughly 3% are trucks.

How long is Interstate 405 over Los Alamitos Channel?

The structure is 36 ft (11 m) long with a longest span of 12 ft (3.7 m) and a deck 169 ft wide.

Who owns Interstate 405 over Los Alamitos Channel?

It is owned by the State Highway Agency.