U.S. Army Corps of Engineers
MAJ Sean Hutchison
Derek Walker
September 20, 2023
SANTA ANA RIVER MAINSTEM
ALCOA ALUMINUM DIKE PHASE 2
UPDATE #4 FOR: CITY OF CORONA
/UNCLASSIFIED/ 2
PRADO BASIN PROJECT FEATURES
Prado Basin will contain the Standard
Project Flood event (approx. 190-year)
Dike features will provide protection up
to the 566-ft elevation around the
perimeter of the basin
/UNCLASSIFIED/ 3
ALCOA DIKE PH 2 PROJECT OVERVIEW
Status:
• Awarded September 2021 to Empire
Equipment Service for $25M
• Working with Southern California
Edison, AT&T, Charter, OCFC and
City for utility relocations
• Earthwork and road relocations:
December 2021 – April 2024
• Hardscape warranty begins April
2024
• Hydroseed application and 12-month
contractor landscape maintenance
period: May 2024 - May 2025
• Project will be turned over to Orange
County Public Works for
maintenance in May 2025
• Road detours end in November 2023
/UNCLASSIFIED/ 4
AUBURNDALE FLOODGATE INSTALLATION
Floodgate Installation from March 2023
/UNCLASSIFIED/ 5
STRIPED AUBURNDALE STREET
Viewing North Viewing South
/UNCLASSIFIED/ 6
TEMPORARY RINCON STREET CLOSURE
/UNCLASSIFIED/ 7
PERMANENT BUTTERFIELD DRIVE SEGMENT CLOSURE
/UNCLASSIFIED/
ALCOA DIKE PHASE 2 PROGRESS PHOTOS
8 New Rincon Dike near future Rincon Street alignment Backfill and riprap replacement along Rincon Street and Dike /UNCLASSIFIED/
QUESTIONS ON ALCOA DIKE?
New bike path along the adjacent Santa Ana River Trail (Phase 4) /UNCLASSIFIED/
PRADO MURAL REPAINTING & PRADO SPILLWAY RAISE