All on site at 7am. Weather conditions very windy and steadily/slowly deteriorating. Lovin finished forming for section N3 and started forming section N1. Poured concrete at section N3 at 12:00pm and started securing their material and equipment in anticipation of in coming storm. DNHI fueled pumps, cleaned intakes and impellers of bypass pumps. Added backfill to S wall space with sheet pile, compacted, 75% of first lift on S side, Lovinstill has forms and platforms in place on the last 60’ section. Storm started moving in at this time, Lovin off site at 2:00pm, DNHI on site till 3:30pm. Bypass pumps turned off to let creek flow and flush creek clean off accumulated debri at intake area. As I was about to turn off hydraulic pump, the sand bag dam under the 110th street bridge collapsed under the pressure of full moon high tide and storm/wind driven surge causing the site to be instantly engulfed.  