US Bridges

State Route 74 over San Juan Creek

Fair

Orange County, California · 12-ORA-074-10.44-SJCP · Structure no. 55 0062

Built
1987
38 years old
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
190 ft
2 main spans
Daily traffic
9,800
2014 count
Owner
State
State Highway Agency

About this bridge

State Route 74 over San Juan Creek is a prestressed concrete continuous box beam or girders - multiple carrying State Route 74 over San Juan Creek in Orange County, California. It was built in 1987, so it is 38 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 9,800 vehicles a day, roughly 5% of them trucks, projected to reach 23,300 by 2040. The structure is 190 ft (57.9 m) long and 44 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesState Route 74
CrossesSan Juan Creek
Location12-ORA-074-10.44-SJCP
RouteState Highway 74
CountyOrange County
StateCalifornia
Coordinates33.57335, -117.54134
Functional classUrban Minor Arterial

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum 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
Structure length190 ft (57.9 m)
Longest span94 ft (28.7 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,800 (2014)
Projected traffic23,300 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 74 over San Juan Creek built?

It was built in 1987, making it 38 years old in 2025.

What condition is State Route 74 over San Juan Creek 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 August 2023.

How much traffic does State Route 74 over San Juan Creek carry?

About 9,800 vehicles per day (2014 count), of which roughly 5% are trucks.

How long is State Route 74 over San Juan Creek?

The structure is 190 ft (57.9 m) long with a longest span of 94 ft (28.7 m) and a deck 44 ft wide.

Who owns State Route 74 over San Juan Creek?

It is owned by the State Highway Agency.