US Bridges

Silverado Cnyn Rd. over Silverado Canyon Creek

Good

Orange County, California · 3.1 MI E/O Santiago Road · Structure no. 55C0181

Built
1970
55 years old
Condition
Good
inspected May 2023
Type
Slab
Concrete
Length
46 ft
1 main span
Daily traffic
2,000
2021 count
Owner
County
County Highway Agency

About this bridge

Silverado Cnyn Rd. over Silverado Canyon Creek is a concrete slab carrying Silverado Cnyn Rd. over Silverado Canyon Creek in Orange County, California. It was built in 1970, so it is 55 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,000 vehicles a day, roughly 1% of them trucks, projected to reach 4,204 by 2041. The structure is 46 ft (14 m) long and 27 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesSilverado Cnyn Rd.
CrossesSilverado Canyon Creek
Location3.1 MI E/O Santiago Road
RouteCounty Highway 0
Coordinates33.74672, -117.62592
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length46 ft (14 m)
Longest span20 ft (6.1 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2021)
Projected traffic4,204 by 2041
Trucks1%
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

OwnerCounty Highway Agency
Maintained byCounty 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 Silverado Cnyn Rd. over Silverado Canyon Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is Silverado Cnyn Rd. over Silverado Canyon Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2023.

How much traffic does Silverado Cnyn Rd. over Silverado Canyon Creek carry?

About 2,000 vehicles per day (2021 count), of which roughly 1% are trucks.

How long is Silverado Cnyn Rd. over Silverado Canyon Creek?

The structure is 46 ft (14 m) long with a longest span of 20 ft (6.1 m) and a deck 27 ft wide.

Who owns Silverado Cnyn Rd. over Silverado Canyon Creek?

It is owned by the County Highway Agency.