US Bridges

SR 55 over S405-N55 Connector

Poor

Orange County, California · 12-ORA-055-R5.89-CMS · Structure no. 55 0423

Built
1966
59 years old, rebuilt 1970
Condition
Poor
inspected April 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
139 ft
3 main spans
Daily traffic
167,000
2020 count
Owner
State
State Highway Agency

About this bridge

SR 55 over S405-N55 Connector is a concrete continuous box beam or girders - multiple carrying SR 55 over S405-N55 Connector in Orange County, California. It was built in 1966 and reconstructed in 1970, so it is 59 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 167,000 vehicles a day, roughly 3% of them trucks, projected to reach 176,489 by 2042. The structure is 139 ft (42.4 m) long and 158 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSR 55
CrossesS405-N55 Connector
Location12-ORA-055-R5.89-CMS
RouteState Highway 55
CountyOrange County
StateCalifornia
Coordinates33.68598, -117.87318
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, 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 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

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length139 ft (42.4 m)
Longest span71 ft (21.6 m)
Deck width158 ft (48.2 m)
Roadway width157 ft (47.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic167,000 (2020)
Projected traffic176,489 by 2042
Trucks3%
Lanes on structure10
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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 SR 55 over S405-N55 Connector built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1970.

What condition is SR 55 over S405-N55 Connector in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2024.

How much traffic does SR 55 over S405-N55 Connector carry?

About 167,000 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is SR 55 over S405-N55 Connector?

The structure is 139 ft (42.4 m) long with a longest span of 71 ft (21.6 m) and a deck 158 ft wide.

Who owns SR 55 over S405-N55 Connector?

It is owned by the State Highway Agency.