Raging Auckland floodwaters take out Riverhead bridge. “We can’t help from here,” another onlooker responds, ”we’re not going across that bridge…there it goes!”Video footage obtained by TVNZ shows the bridge, which spans Mill Flat Rd in Riverhead, collapse under the pressure from the raging water. “Ooh shit”...see you later Mill Flat Rd,” says one of the witnesses. Some people were rescued from Sunnyside Rd due to the damage from the flood. The dramatic footage comes as a state of emergency was declared in Auckland after widespread flooding on Friday night.