Santa Ana River: Reach 9 Phase 5A

4 Documents in Project


SCH Number
Lead Agency
U.S. Army Corps of Engineers
Document Title
Santa Ana River: Reach 9 Phase 5A
Document Type
ADM - Addendum

Document Description
Note: FYI per lead. The U.S. Army Corps of Engineers proposes to modify a bank protection structure within Reach 9 of the Santa Ana River that was approved for construction in 2015. Modifications include deleting the upstream-most segment of the planned structure, and expanding staging areas. Location of a permanent maintenance road has also been clarified. Phase 5B is located in the City of Yorba Linda, Orange County. The purpose of the project is to prevent undercutting and erosion of Santa Ana River embankment, caused by high-velocity flows and associated scour. This SEA/EIR Addendum supplements a 2015 document that also addressed bank and bridge protection in other areas of Reach 9 (Phase 4, Phase SA and BNSF Bridge).

Contact Information
Chris Jones
U.S. Army Corps of Engineers
915 Wilshire Boulevard, Ste 930
Los Angeles, CA 90017



33°52'44."N 117°44'35"W
Yorba Linda Orange Corona
Cross Streets
Weir Canyon Rd and East La Palma Ave, Yorba Linda, OC
Total Acres
State Highways
SR-91, 241
Santa Ana River

Notice of Completion

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