US Bridges

S1-COAST Hiway Off over San Juan Creek

Fair

Orange County, California · 12-ORA-001-R1.00-DAPT · Structure no. 55 0015Y

Built
1927
98 years old, rebuilt 1947
Condition
Fair
inspected June 2023
Type
Tee Beam
Concrete
Length
434 ft
8 main spans
Daily traffic
8,000
2014 count
Owner
State
State Highway Agency

About this bridge

S1-COAST Hiway Off over San Juan Creek is a concrete tee beam carrying S1-COAST Hiway Off over San Juan Creek in Orange County, California. It was built in 1927 and reconstructed in 1947, so it is 98 years old, older 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 8,000 vehicles a day, roughly 6% of them trucks, projected to reach 9,499 by 2040. The structure is 434 ft (132.3 m) long and 65 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesS1-COAST Hiway Off
CrossesSan Juan Creek
Location12-ORA-001-R1.00-DAPT
RouteState Highway 1
CountyOrange County
StateCalifornia
Coordinates33.46369, -117.68221
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionJune 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 geometry9: Superior to present desirable criteria
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 typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length434 ft (132.3 m)
Longest span54 ft (16.5 m)
Deck width65 ft (19.7 m)
Roadway width54 ft (16.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,000 (2014)
Projected traffic9,499 by 2040
Trucks6%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was S1-COAST Hiway Off over San Juan Creek built?

It was built in 1927, making it 98 years old in 2025. It was reconstructed in 1947.

What condition is S1-COAST Hiway Off 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 June 2023.

How much traffic does S1-COAST Hiway Off over San Juan Creek carry?

About 8,000 vehicles per day (2014 count), of which roughly 6% are trucks.

How long is S1-COAST Hiway Off over San Juan Creek?

The structure is 434 ft (132.3 m) long with a longest span of 54 ft (16.5 m) and a deck 65 ft wide.

Who owns S1-COAST Hiway Off over San Juan Creek?

It is owned by the State Highway Agency.