US Bridges

Seal Beach Blvd over State Route 405

Fair

Orange County, California · 12-ORA-405-22.64-SLB · Structure no. 55 1099

Built
2014
11 years old
Condition
Fair
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
472 ft
2 main spans
Daily traffic
20,000
2020 count
Owner
State
State Highway Agency

About this bridge

Seal Beach Blvd over State Route 405 is a prestressed concrete continuous box beam or girders - multiple carrying Seal Beach Blvd over State Route 405 in Orange County, California. It was built in 2014, so it is 11 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 20,000 vehicles a day, roughly 3% of them trucks, projected to reach 22,295 by 2042. The structure is 472 ft (144 m) long and 130 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

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CarriesSeal Beach Blvd
CrossesState Route 405
Location12-ORA-405-22.64-SLB
RouteCity Street 0
CountyOrange County
StateCalifornia
Coordinates33.77434, -118.07503
Functional classUrban Other Principal Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 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 rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length472 ft (144 m)
Longest span258 ft (78.5 m)
Deck width130 ft (39.6 m)
Roadway width118 ft (36 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,000 (2020)
Projected traffic22,295 by 2042
Trucks3%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed2.5 mi (4 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 Seal Beach Blvd over State Route 405 built?

It was built in 2014, making it 11 years old in 2025.

What condition is Seal Beach Blvd over State Route 405 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 Seal Beach Blvd over State Route 405 carry?

About 20,000 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is Seal Beach Blvd over State Route 405?

The structure is 472 ft (144 m) long with a longest span of 258 ft (78.5 m) and a deck 130 ft wide.

Who owns Seal Beach Blvd over State Route 405?

It is owned by the State Highway Agency.