US Bridges

State Route 74 WB over San Juan Creek

Fair

Orange County, California · 12-ORA-074-R2.26-SJCP · Structure no. 55 0850L

Built
2014
11 years old
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
271 ft
2 main spans
Daily traffic
5,500
2014 count
Owner
State
State Highway Agency

About this bridge

State Route 74 WB over San Juan Creek is a prestressed concrete continuous box beam or girders - multiple carrying State Route 74 WB over San Juan Creek in Orange County, California. It was built in 2014, so it is 11 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 5,500 vehicles a day, roughly 4% of them trucks, projected to reach 11,000 by 2042. The structure is 271 ft (82.5 m) long and 58 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesState Route 74 WB
CrossesSan Juan Creek
Location12-ORA-074-R2.26-SJCP
RouteState Highway 74
Coordinates33.51925, -117.62496
Functional classRural 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 above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length271 ft (82.5 m)
Longest span137 ft (41.8 m)
Deck width58 ft (17.8 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,500 (2014)
Projected traffic11,000 by 2042
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 74 WB over San Juan Creek built?

It was built in 2014, making it 11 years old in 2025.

What condition is State Route 74 WB 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 WB over San Juan Creek carry?

About 5,500 vehicles per day (2014 count), of which roughly 4% are trucks.

How long is State Route 74 WB over San Juan Creek?

The structure is 271 ft (82.5 m) long with a longest span of 137 ft (41.8 m) and a deck 58 ft wide.

Who owns State Route 74 WB over San Juan Creek?

It is owned by the State Highway Agency.