Sandia Creek Drive Bridge Replacement and Fish Passage Project

3 Documents in Project


SCH Number
Lead Agency
San Diego County
Document Title
Sandia Creek Drive Bridge Replacement and Fish Passage Project
Document Type
MND - Mitigated Negative Declaration
Present Land Use
S80-Open Space; Public Agency Land
Document Description
The project consists of the removal and replacement of an aging low-flow and flood-prone concrete box culvert river crossing over the Santa Margarita River on Sandia Creek Drive. The box culvert crossing, which has created a significant fish passage barrier on the Santa Margarita River, will be removed following construction of a new steel and concrete span bridge. The new bridge will span the river (574 feet in length), with an abutment including wing walls at either end of the bridge and two piers in between. Thus, the bridge will have three sections, the first section of which will span 214 feet (over the main Santa Margarita River channel), and each of the two remaining sections will span 176 feet. The bridge will provide two paved traffic lanes (12 feet wide) with two shoulders (8 feet wide) within a 68-foot-wide road right-of-way. The road surface of the bridge will range in elevation from just over 354 feet above mean sea level (amsl) at the northern abutment to just over 359 feet near the center of the bridge. In comparison, the ordinary high-water elevation of the river is 331 feet amsl, while the 100-year water surface elevation is just over 346 feet amsl. The new bridge is designed to pass the 100-year peak discharge with one foot of freeboard pursuant to the San Diego County Hydraulic Design Manual. The new bridge will be constructed about 160 feet downstream of the existing box culvert crossing. The existing box culvert crossing on Sandia Creek Drive will remain open to traffic during construction of the new steel bridge. Construction of this span bridge and removal of the existing crossing will occur over a period of approximately two years. A temporary trail approximately eight feet in width and 600 feet in length will be constructed south of and above Sandia Creek Drive between the south end of the construction zone at Sandia Creek Drive and the existing parking lot for the Santa Margarita Trail Preserve to maintain trail access around the site and to trails upstream and downstream of the project site.

Contact Information

Robert Hingtgen
Agency Name
County of San Diego, Planning & Development Services
Job Title
Planner III
Contact Types
Lead/Public Agency


San Diego
Cross Streets
Sandia Creek Drive and Rock Mountain Drive
Total Acres
Parcel #
State Highways
S13 East Mission Road
Santa Margarita River, Sandia Creek
Other Location Info
The project is located approximately two miles north of the village area of Fallbrook, 160 feet southwest of the intersection of Rock Mountain Drive and Sandia Creek Drive where Sandia Creek Drive crosses the Santa Margarita River (APN 102-250-24-00) in the Fallbrook Community Planning Area of unincorporated San Diego County, California

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 Parks and Recreation, California Department of State Parks, Division of Boating and Waterways, California Department of Transportation, District 11 (DOT), California Department of Water Resources (DWR), California Fish and Game Commission (CDFGC), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, San Diego Region 9 (RWQCB), California State Lands Commission (SLC), Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Quality, California Department of Fish and Wildlife, South Coast Region 5 (CDFW)
State Reviewing Agency Comments
California Department of Fish and Wildlife, South Coast Region 5 (CDFW)
Development Types
Transportation:Local Road (Replace existing box culvert crossing with a bridge )
Local Actions
Grading Plan, Improvement Plan
Project Issues
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Energy, 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, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire
Local Review Period Start
Local Review Period End


Notice of Completion [NOC] Transmittal form
State Comment Letters [Comments from state reviewing agencies]

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