US Bridges

Silverado Canyn RD over Ladd Canyon

Fair

Orange County, California · 2.2 Mi. E/O Santiago Road · Structure no. 55C0175

Built
1947
78 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
52 ft
1 main span
Daily traffic
2,000
2021 count
Owner
County
County Highway Agency

About this bridge

Silverado Canyn RD over Ladd Canyon is a steel stringer/multi-beam or girder carrying Silverado Canyn RD over Ladd Canyon in Orange County, California. It was built in 1947, so it is 78 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 52 ft (15.7 m) long and 27 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSilverado Canyn RD
CrossesLadd Canyon
Location2.2 Mi. E/O Santiago Road
RouteCounty Highway 0
CountyOrange County
StateCalifornia
Coordinates33.74811, -117.64047
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 protection7 GoodSome minor problems.
Last inspectionApril 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.7 US tons
Inventory rating24.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length52 ft (15.7 m)
Longest span50 ft (15.2 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.4 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 Canyn RD over Ladd Canyon built?

It was built in 1947, making it 78 years old in 2025.

What condition is Silverado Canyn RD over Ladd Canyon 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 Canyn RD over Ladd Canyon carry?

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

How long is Silverado Canyn RD over Ladd Canyon?

The structure is 52 ft (15.7 m) long with a longest span of 50 ft (15.2 m) and a deck 27 ft wide.

Who owns Silverado Canyn RD over Ladd Canyon?

It is owned by the County Highway Agency.