▁F lin tr idge ▁and ▁Alt ad ena , ▁is ▁the ▁narrow est ▁spot ▁on ▁the ▁Ar roy o ▁Sec o ' s ▁course ▁below ▁Mill ard ▁C any on . ▁The ▁construction ▁was ▁by ▁the ▁Bent ▁Brothers ▁Company . ▁ ▁A bove ▁the ▁dam ▁is ▁the ▁flo od ▁bas in ▁which ▁capt ures ▁the ▁flows ▁of ▁the ▁mountain ▁waters hed ▁of ▁the ▁Ar roy o ▁Sec o . ▁This ▁area ▁is ▁now ▁called ▁" H ah am ong na ", ▁a ▁phrase ▁meaning ▁" Flow ing ▁W aters , ▁F ruit ful ▁Valley ", ▁a ▁remark ably ▁different ▁design ation ▁than ▁the ▁name ▁given ▁the ▁area ▁by ▁the ▁Spanish ▁expl or ers . ▁H ah am ong na ▁also ▁refers ▁to ▁the ▁original ▁Native ▁American ▁tribe ▁of ▁the ▁T ong va ▁Indians ▁who ▁once ▁inhab ited ▁the ▁area . ▁By ▁ 2 0 1 1 , ▁the ▁flo od ▁bas in ▁had ▁filled ▁with ▁de br is ▁brought ▁down ▁after ▁the ▁ 2 0 0 9 ▁Station ▁Fire , ▁reducing ▁its ▁effect iveness ▁as ▁a ▁flo od ▁control ▁measure . ▁The ▁County ▁of ▁Los ▁Angeles ▁conducted ▁public ▁hear ings ▁on ▁the ▁Environment al ▁impact ▁statement ▁before ▁selecting ▁a ▁method ▁to ▁remove ▁de br is ▁from ▁the ▁H ah am ong na ▁area . ▁In ▁ 2 0 1 4 , ▁the ▁Board ▁of ▁Super vis ors ▁approved ▁a ▁five - year ▁project ▁to ▁remove ▁ 2 . 4 ▁million ▁cub ic ▁yards ▁of ▁sed iment ▁() ▁from ▁the ▁bas in ▁despite ▁strong