US Bridges

4th ST-S55 on Ramp over S55-N&S5 Connectors

Good

Orange County, California · 12-ORA-055-10.90-SA · Structure no. 55 0648K

Built
1992
33 years old
Condition
Good
inspected March 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
240 ft
2 main spans
Daily traffic
7,386
2024 count
Owner
State
State Highway Agency

About this bridge

4th ST-S55 on Ramp over S55-N&S5 Connectors is a prestressed concrete continuous box beam or girders - multiple carrying 4th ST-S55 on Ramp over S55-N&S5 Connectors in Orange County, California. It was built in 1992, so it is 33 years old, younger 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 7,386 vehicles a day, roughly 3% of them trucks, projected to reach 10,230 by 2046. The structure is 240 ft (73.2 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries4th ST-S55 on Ramp
CrossesS55-N&S5 Connectors
Location12-ORA-055-10.90-SA
RouteState Highway 55
CountyOrange County
StateCalifornia
Coordinates33.74723, -117.83288
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum 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
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length240 ft (73.2 m)
Longest span124 ft (37.8 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,386 (2024)
Projected traffic10,230 by 2046
Trucks3%
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 4th ST-S55 on Ramp over S55-N&S5 Connectors built?

It was built in 1992, making it 33 years old in 2025.

What condition is 4th ST-S55 on Ramp over S55-N&S5 Connectors 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 March 2024.

How much traffic does 4th ST-S55 on Ramp over S55-N&S5 Connectors carry?

About 7,386 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is 4th ST-S55 on Ramp over S55-N&S5 Connectors?

The structure is 240 ft (73.2 m) long with a longest span of 124 ft (37.8 m) and a deck 35 ft wide.

Who owns 4th ST-S55 on Ramp over S55-N&S5 Connectors?

It is owned by the State Highway Agency.