Santa Ana River Mainstem Project, Reach 9, Phase 3

19 Documents in Project


SCH Number
Lead Agency
U.S. Army Corps of Engineers
Document Title
Santa Ana River Mainstem Project, Reach 9, Phase 3
Document Type
ADM - Addendum

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
United States Army Corps of Engineers
Prado Dam Field Office 2493 Pomona Rincon Road
Corona, CA 92880

213 304 6234


33°52'15.71"N 117°42'13.38"W
Chino Corona Yorba Linda
Cross Streets
Gypsum Canyon Road
Total Acres
State Highways
Santa Ana River
Other Location Info
Unincorporated area.

Notice of Completion

Review Period Start
Review Period End
Development Type
Other (Flood Control)
Local Action
Use Permit
Project Issues
Aesthetic/Visual Air Quality Archaeologic-Historic Biological Resources Flood Plain/Flooding Geologic/Seismic Noise Population/Housing Balance Public Services Recreation/Parks Soil Erosion/Compaction/Grading Toxic/Hazardous Traffic/Circulation Vegetation Water Quality Water Supply Wetland/Riparian Land Use Cumulative Effects
Reviewing Agencies
California Department of Parks and Recreation California Highway Patrol Caltrans, District 12 Caltrans, Division of Aeronautics Department of Conservation Department of Fish and Wildlife, Region 5 Department of Water Resources Office of Emergency Services, California Regional Water Quality Control Board, Region 8 Resources Agency State Water Resources Control Board, Division of Water Quality Native American Heritage Commission
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