Santa Ana River Mainstem Project, Reach 9, Phase 3

23 Documents in Project


SCH Number
Lead Agency
United States Army, Army Corps of Engineers (USACE)
Document Title
Santa Ana River Mainstem Project, Reach 9, Phase 3
Document Type
ADM - Addendum
Present Land Use
Flood control, recreation, open space
Document Description
Note: Review per lead & Addendum The 2001 SEIS/EIR had identified six distinct locations on the south and north banks of Reach 9 that required protection. However, the Lower Santa Ana Mainstem Project Design Documentation report dated November 2011 indicated the need to improve bank protection to additional areas within Reach 9. This SEA/EIR Addendum evaluates the environmental impacts associated with the reconstruction of an existing 1,600-foot long soil cement embankment structure located adjacent to SR 91, upstream of Gypsum Canyon Road. The reconstructed embankment would provide increased flood and scour protection to SR-91 and the Santa Ana River Interceptor pipeline which will relocated to the area between the existing levee embankment and SR 91.

Contact Information

Chris Jones
Agency Name
United States Army Corps of Engineers
Contact Types
Lead/Public Agency


Chino, Corona, Yorba Linda
Cross Streets
Gypsum Canyon Road
Total Acres
State Highways
Santa Ana River
Other Location Info
Unincorporated area.

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
California Department of Conservation (DOC), California Department of Fish and Wildlife, South Coast Region 5 (CDFW), California Department of Parks and Recreation, California Department of Transportation, District 12 (DOT), California Highway Patrol, 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, Division of Water Quality, California Native American Heritage Commission (NAHC)
State Reviewing Agency Comments
California Native American Heritage Commission (NAHC)
Development Types
Other (Flood Control)
Local Actions
Use Permit
Project Issues
Aesthetics, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Flood Plain/Flooding, Geology/Soils, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Noise, Population/Housing, Public Services, Recreation, Transportation, Vegetation, Wetland/Riparian

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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