US Bridges

MACARTHUR-S73 Onra over SR 73 & MACARTHUR-N73 on

Fair

Orange County, California · 12-ORA-073-24.02-IRVN · Structure no. 55 0732K

Built
1996
29 years old
Condition
Fair
inspected May 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
883 ft
5 main spans
Daily traffic
4,880
2014 count
Owner
State
State Highway Agency

About this bridge

MACARTHUR-S73 Onra over SR 73 & MACARTHUR-N73 on is a prestressed concrete continuous box beam or girders - multiple carrying MACARTHUR-S73 Onra over SR 73 & MACARTHUR-N73 on in Orange County, California. It was built in 1996, so it is 29 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 4,880 vehicles a day, roughly 1% of them trucks, projected to reach 5,370 by 2042. The structure is 883 ft (269 m) long and 39 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMACARTHUR-S73 Onra
CrossesSR 73 & MACARTHUR-N73 on
Location12-ORA-073-24.02-IRVN
RouteState Highway 73
CountyOrange County
StateCalifornia
Coordinates33.64228, -117.86016
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 inspectionMay 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 rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length883 ft (269 m)
Longest span240 ft (73 m)
Deck width39 ft (12 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,880 (2014)
Projected traffic5,370 by 2042
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a toll 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-S73 Onra over SR 73 & MACARTHUR-N73 on built?

It was built in 1996, making it 29 years old in 2025.

What condition is MACARTHUR-S73 Onra over SR 73 & MACARTHUR-N73 on 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-S73 Onra over SR 73 & MACARTHUR-N73 on carry?

About 4,880 vehicles per day (2014 count), of which roughly 1% are trucks.

How long is MACARTHUR-S73 Onra over SR 73 & MACARTHUR-N73 on?

The structure is 883 ft (269 m) long with a longest span of 240 ft (73 m) and a deck 39 ft wide.

Who owns MACARTHUR-S73 Onra over SR 73 & MACARTHUR-N73 on?

It is owned by the State Highway Agency.