US Bridges

State Route 55 over North Orange Uc

Good

Orange County, California · 12-ORA-055-15.50-ORA · Structure no. 55 0325

Built
1961
64 years old, rebuilt 2002
Condition
Good
inspected March 2024
Type
Slab
Concrete Continuous
Length
122 ft
3 main spans
Daily traffic
227,000
2020 count
Owner
State
State Highway Agency

About this bridge

State Route 55 over North Orange Uc is a concrete continuous slab carrying State Route 55 over North Orange Uc in Orange County, California. It was built in 1961 and reconstructed in 2002, so it is 64 years old, older 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 227,000 vehicles a day, roughly 6% of them trucks, projected to reach 246,000 by 2042. The structure is 122 ft (37.2 m) long and 227 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesState Route 55
CrossesNorth Orange Uc
Location12-ORA-055-15.50-ORA
RouteState Highway 55
Coordinates33.81371, -117.8316
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 48 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 typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length122 ft (37.2 m)
Longest span40 ft (12.2 m)
Deck width227 ft (69.3 m)
Roadway width222 ft (67.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic227,000 (2020)
Projected traffic246,000 by 2042
Trucks6%
Lanes on structure14
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 55 over North Orange Uc built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 2002.

What condition is State Route 55 over North Orange Uc 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 State Route 55 over North Orange Uc carry?

About 227,000 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is State Route 55 over North Orange Uc?

The structure is 122 ft (37.2 m) long with a longest span of 40 ft (12.2 m) and a deck 227 ft wide.

Who owns State Route 55 over North Orange Uc?

It is owned by the State Highway Agency.