Silverado Canyon Road Bridge (No. 55C-0174) Replacement Over Silverado Creek Project

2 Documents in Project


SCH Number
Lead Agency
Orange County
Document Title
Silverado Canyon Road Bridge (No. 55C-0174) Replacement Over Silverado Creek Project
Document Type
MND - Mitigated Negative Declaration
Present Land Use
Rural Residential (1A) and Suburban Residential (1B)
Document Description
The County of Orange Public Works (County), in cooperation with the California Department of Transportation (Caltrans) and the Federal Highway Administration (FHWA), intends to replace the Silverado Canyon Road Bridge over Silverado Creek (Bridge No. 55C-0174). The existing structure was built in 1935 and is a single-span riveted steel through plate girder bridge with concrete deck on reinforced concrete abutments all supported on concrete spread footings. The bridge is 58 feet long and 32 feet wide and carries two lanes of traffic over the Silverado Creek. The bridge cross section consists of two 2-foot-wide combined curb and railing, a 4-foot-wide walkway (north side), as well as two 12-foot-wide traffic lanes. The proposed replacement bridge would be a concrete bridge approximately 58 feet long and 44 feet wide. The bridge would support two 12-foot-wide traffic lanes, two 5-foot shoulders, two traffic barriers, and a 5-foot sidewalk with railing (north side). The Project would require staged construction that always maintains one lane of traffic open during construction. Half of the existing steel bridge would be removed during the first construction phase while the remaining half would be supported on temporary falsework in order to maintain one lane of traffic open during construction. The falsework supports would be supported on spread footings within the creek. The Project would be completed within existing right-of-way; however, a temporary construction easement would be required. Project construction is anticipated to start in 2023 and construction would last approximately 12 months.

Contact Information

Cindy Salazar
Agency Name
County of Orange
Job Title
Senior Planner
Contact Types
Lead/Public Agency


Cross Streets
Silverado Canyon Road

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, South Coast Region 5 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Transportation, District 12 (DOT), California Department of Water Resources (DWR), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, Santa Ana Region 8 (RWQCB), Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water
Development Types
Transportation:Local Road (Bridge Replacement)
Local Actions
Project Issues
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mandatory Findings of Significance, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wildfire
Local Review Period Start
Local Review Period End


Notice of Completion [NOC] Transmittal form

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