US Bridges

Silverado Cnyn Rd. over Silverado Canyon Creek

Fair

Orange County, California · 1.6 MI E/O Santiago Road · Structure no. 55C0174

Built
1935
90 years old
Condition
Fair
inspected April 2023
Type
Girder and Floorbeam System
Steel
Length
58 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 steel girder and floorbeam system carrying Silverado Cnyn Rd. over Silverado Canyon Creek in Orange County, California. It was built in 1935, so it is 90 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 2,000 vehicles a day, roughly 1% of them trucks, projected to reach 4,204 by 2041. The structure is 58 ft (17.7 m) long and 32 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSilverado Cnyn Rd.
CrossesSilverado Canyon Creek
Location1.6 MI E/O Santiago Road
RouteCounty Highway 0
CountyOrange County
StateCalifornia
Coordinates33.74565, -117.65021
Functional classRural Local

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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41.1 US tons
Inventory rating26.8 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length58 ft (17.7 m)
Longest span58 ft (17.7 m)
Deck width32 ft (9.7 m)
Roadway width23 ft (7 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 and pedestrian
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 1935, making it 90 years old in 2025.

What condition is Silverado Cnyn Rd. over Silverado Canyon 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 April 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 58 ft (17.7 m) long with a longest span of 58 ft (17.7 m) and a deck 32 ft wide.

Who owns Silverado Cnyn Rd. over Silverado Canyon Creek?

It is owned by the County Highway Agency.