US Bridges

S55-S405 Connector over I 405 SR 55 & Conns

Fair

Orange County, California · 12-ORA-055-R6.16-CMS · Structure no. 55 0438F

Built
1968
57 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
1,559 ft
14 main spans
Daily traffic
22,290
2020 count
Owner
State
State Highway Agency

About this bridge

S55-S405 Connector over I 405 SR 55 & Conns is a concrete continuous box beam or girders - multiple carrying S55-S405 Connector over I 405 SR 55 & Conns in Orange County, California. It was built in 1968, so it is 57 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 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 22,290 vehicles a day, roughly 4% of them trucks, projected to reach 25,751 by 2042. The structure is 1,559 ft (475.2 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesS55-S405 Connector
CrossesI 405 SR 55 & Conns
Location12-ORA-055-R6.16-CMS
RouteState Highway 55
CountyOrange County
StateCalifornia
Coordinates33.68676, -117.86878
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.1 US tons
Inventory rating32.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans14
Design loadHS 20 + Mod
Structure length1,559 ft (475.2 m)
Longest span140 ft (42.7 m)
Deck width40 ft (12.2 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,290 (2020)
Projected traffic25,751 by 2042
Trucks4%
Lanes on structure2
Traffic directionOne-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 S55-S405 Connector over I 405 SR 55 & Conns built?

It was built in 1968, making it 57 years old in 2025.

What condition is S55-S405 Connector over I 405 SR 55 & Conns 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 April 2024.

How much traffic does S55-S405 Connector over I 405 SR 55 & Conns carry?

About 22,290 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is S55-S405 Connector over I 405 SR 55 & Conns?

The structure is 1,559 ft (475.2 m) long with a longest span of 140 ft (42.7 m) and a deck 40 ft wide.

Who owns S55-S405 Connector over I 405 SR 55 & Conns?

It is owned by the State Highway Agency.