US Bridges

MACARTHUR-N73 Onra over Macarthur Blvd

Fair

Orange County, California · 12-ORA-073-24.67-IRVN · Structure no. 55 0637S

Built
1985
40 years old
Condition
Fair
inspected May 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
324 ft
2 main spans
Daily traffic
5,090
2014 count
Owner
State
State Highway Agency

About this bridge

MACARTHUR-N73 Onra over Macarthur Blvd is a prestressed concrete continuous box beam or girders - multiple carrying MACARTHUR-N73 Onra over Macarthur Blvd in Orange County, California. It was built in 1985, so it is 40 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 5,090 vehicles a day, roughly 1% of them trucks, projected to reach 5,600 by 2042. The structure is 324 ft (98.8 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMACARTHUR-N73 Onra
CrossesMacarthur Blvd
Location12-ORA-073-24.67-IRVN
RouteState Highway 73
CountyOrange County
StateCalifornia
Coordinates33.65375, -117.86084
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length324 ft (98.8 m)
Longest span170 ft (51.8 m)
Deck width40 ft (12.3 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,090 (2014)
Projected traffic5,600 by 2042
Trucks1%
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 MACARTHUR-N73 Onra over Macarthur Blvd built?

It was built in 1985, making it 40 years old in 2025.

What condition is MACARTHUR-N73 Onra over Macarthur Blvd 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 May 2024.

How much traffic does MACARTHUR-N73 Onra over Macarthur Blvd carry?

About 5,090 vehicles per day (2014 count), of which roughly 1% are trucks.

How long is MACARTHUR-N73 Onra over Macarthur Blvd?

The structure is 324 ft (98.8 m) long with a longest span of 170 ft (51.8 m) and a deck 40 ft wide.

Who owns MACARTHUR-N73 Onra over Macarthur Blvd?

It is owned by the State Highway Agency.