SR-73 Basin Stormwater Mitigation and Slope Stability

3 Documents in Project


SCH Number
Lead Agency
California Department of Transportation, District 12
Document Title
SR-73 Basin Stormwater Mitigation and Slope Stability
Document Type
MND - Mitigated Negative Declaration
Present Land Use
Open Space; Planned Community; Residential; Research/Industrial
Document Description
SR 73 possesses a system of 39 storm water detention basins that capture and filter runoff from the highway prior to discharging it to natural drainage areas. Water quality monitoring was performed in the basins during the rainy seasons of 2004/2005. An excessive amount of sediment was observed in some of the basins. The sediment load is believed to originate from outside the footprint of the basins, but from within the watershed. The sediment load may comprise the filtering capability of the basins. The intent of this project is to prevent erosion from entering into 9 of the basins by implementing various erosion control measures (e.g. slope stabilization, slope redesign).

Contact Information

Smita Deshpande
Agency Name
California Department of Transportation, District 12
Contact Types
Lead/Public Agency


Laguna Niguel, Newport Beach
Cross Streets
MacArthur Blvd to Greenfield Dr
Total Acres
State Highways
SR 73
John Wayne
Sage Hill HS
San Diego Creek, Bonita Creek, Aliso Creek

Notice of Completion

Review Period Start
Review Period End
Development Types
Waste Treatment:Other (stormwater)
Project Issues
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Flood Plain/Flooding, Geology/Soils, Growth Inducement, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Schools/Universities, Solid Waste, Transportation, Vegetation, Wetland/Riparian, Paleo; utilities
Reviewing Agencies
California Department of Fish and Wildlife, South Coast Region 5 (CDFW), California Department of Parks and Recreation, California Highway Patrol, California Native American Heritage Commission (NAHC), California Regional Water Quality Control Board, Santa Ana Region 8 (RWQCB), Caltrans, Division of Aeronautics, Department of Water Resources, Office of Emergency Services, California, Resources Agency, State Water Resources Control Board, Divison of Financial Assistance

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613.

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